Following its successful participation in the IT Press Tour, Vinchin has continued to receive widespread recognition from leading enterprise technology media across Europe, North America, and Australia. The extensive coverage highlights the growing international interest in Vinchin's data protection solutions and reinforces the company's expanding presence in the global enterprise backup market.

The IT Press Tour brought together influential technology journalists and industry analysts to explore emerging innovations shaping enterprise IT. During the event, Vinchin shared its vision for modern data protection, cross-platform backup, disaster recovery, and its commitment to delivering reliable and cost-effective solutions for organizations worldwide.

In the weeks following the event, multiple respected technology publications published in-depth reports covering Vinchin's strategy, product capabilities, and international expansion plans.

• IT Europa (United Kingdom)

As one of Europe's leading IT channel and enterprise technology publications, IT Europa highlighted Vinchin's ambition to expand its global partner ecosystem and strengthen its presence in Western markets. The article discussed Vinchin's competitive positioning in enterprise backup and its channel-driven growth strategy.

Read the full article: https://www.iteuropa.com/news/chinas-vinchin-targets-western-channels-its-data-management

• iTWire (Australia)

Australia's influential enterprise technology publication iTWire published a comprehensive feature introducing Vinchin's backup technology, multi-platform protection capabilities, and market positioning. The report also explored Vinchin's approach to serving organizations seeking flexible and cost-effective alternatives in the enterprise data protection landscape.

Read the full article: https://itwire.com/business-it-news/enterprise-solutions/it-press-tour-the-value-challenger-from-chengdu-vinchin-undercuts-veeam-and-commvault-saves-vmware-refugees-and-asks-the-west-to-look-past-the-flag

• VMblog (United States)

VMblog, a well-established publication focused on virtualization, cloud infrastructure, and enterprise data centers, examined Vinchin's technology strengths and its growing competitiveness in the global backup software market. The article emphasized Vinchin's ability to address increasingly diverse enterprise backup requirements across virtual, cloud, and physical environments.

Read the full article: https://vmblog.com/bylines/vinchin-wants-a-bigger-slice-of-the-backup-pie-they-have-the-technology-but-can-they-win-over-the-west/

• Security Storage und Channel Germany

Serving enterprise IT professionals across Germany and the DACH region, Security Storage und Channel Germany reported on Vinchin's channel strategy, competitive pricing model, and commitment to helping organizations modernize their data protection infrastructure. The publication highlighted Vinchin's long-term vision for expanding its international partner network.

Read the full article: https://security-storage-und-channel-germany.de/language/es/vinchin-apuesta-por-una-estrategia-de-canal-y-precios-competitivos-para-conquistar-el-mercado-global-de-proteccion-de-datos/

• Le Monde Informatique (France)

French enterprise technology publication Le Monde Informatique focused on Vinchin's international expansion strategy and its growing recognition among enterprise customers seeking modern, flexible backup solutions. The report introduced Vinchin's technological innovation and commitment to supporting global digital transformation initiatives.

Read the full article: https://www.lemondeinformatique.fr/actualites/lire-vinchin-un-outsider-chinois-sur-le-marche-de-la-sauvegarde%C2%A0-100445.html

• StorageNewsletter

As one of the world's leading storage industry publications, StorageNewsletter published multiple reports covering Vinchin's participation in the IT Press Tour. The articles introduced the company's technology roadmap, backup innovations, and strategic vision while providing readers with a comprehensive overview of Vinchin's role in the evolving enterprise data protection market.

Read the full article: https://www.storagenewsletter.com/2026/06/17/it-press-tour-68-vinchin/

Official Interview Video

Watch Vinchin's official interview and learn more about its vision for enterprise data protection, backup innovation, and global market expansion.

Growing Global Visibility

The broad international media coverage following the IT Press Tour reflects the increasing attention Vinchin is receiving from enterprise technology communities worldwide. Across multiple regions and languages, journalists recognized Vinchin's commitment to delivering secure, reliable, and cost-effective data protection solutions for modern IT environments.

As organizations continue accelerating digital transformation and strengthening cyber resilience, Vinchin remains committed to helping businesses safeguard critical workloads across virtual, physical, cloud, NAS, database, and SaaS environments.

Looking ahead, Vinchin will continue expanding its global partner ecosystem, strengthening collaboration with customers and technology communities worldwide, and delivering innovative backup and disaster recovery solutions that enable organizations to protect their most valuable data with confidence.

Looking Ahead

As digital transformation, cyber resilience, and regulatory compliance continue reshaping enterprise IT priorities, reliable data protection has never been more critical.

Vinchin remains committed to developing comprehensive backup and disaster recovery solutions that simplify data protection while enabling organizations to recover quickly from cyber threats, system failures, and unexpected disruptions.

Building on the momentum generated by the IT Press Tour and the strong response from international technology media, Vinchin will continue working closely with customers, partners, and the global IT community to deliver secure, intelligent, and future-ready data protection solutions.

About Vinchin

Vinchin is a leading provider of enterprise backup and disaster recovery solutions, dedicated to helping organizations protect critical data across virtual, physical, cloud, and hybrid environments. Founded in 2015, Vinchin serves customers in more than 180 countries and regions, with over 30,000 deployments protecting 600,000+ workloads worldwide. Its unified backup platform delivers agentless backup, disaster recovery, cross-platform migration, ransomware protection, and centralized management for a wide range of IT infrastructures. Through continuous innovation, broad platform compatibility, and a global partner ecosystem, Vinchin empowers enterprises to build resilient, secure, and future-ready data protection strategies.

Vinchin, a leading provider of backup and disaster recovery solutions, is proud to announce that Vinchin Backup & Recovery has earned multiple G2 Spring 2026 Badges, recognizing its outstanding customer satisfaction, strong product performance, and continued commitment to delivering reliable data protection solutions. 

These recognitions are based on authentic feedback and reviews from verified users on G2, one of the world's leading software review platforms. The awards reflect customers' confidence in Vinchin's capabilities to provide secure, efficient, and easy-to-use backup and recovery solutions for modern IT environments. 

Recognized with Multiple G2 Spring 2026 Badges In the Spring 2026 G2 Reports, Vinchin Backup & Recovery has achieved the following recognitions:

1.Regional Leader: Asia Pacific
2.Regional Leader: EMEA
3.Leader: Small Business
4. Easiest Admin: Mid-Market
5.Easiest Setup: Mid-Market
6.Easiest To Use: Mid-Market
7.Users Most Likely To Recommend: Mid-Market

These achievements demonstrate Vinchin's continuous efforts to enhance product innovation, improve user experience, and support organizations worldwide in protecting their critical data.

Powered by Customer Recognition

Customer feedback has always been a key driver behind Vinchin’s product development and service improvements.

Through reviews shared by users worldwide, Vinchin Backup & Recovery has been recognized for its reliable performance, intuitive operation, flexible deployment options, and responsive technical support. These valuable insights continue to inspire Vinchin to deliver better solutions that address evolving data protection challenges.

Building Stronger Data Resilience for Modern Enterprises

As organizations face increasing challenges from cyber threats, growing data volumes, and complex IT infrastructures, reliable backup and disaster recovery have become essential for business continuity. 

Vinchin Backup & Recovery provides comprehensive protection across virtual, physical, cloud, and hybrid environments, supporting leading virtualization platforms and helping enterprises achieve secure backup, fast recovery, and simplified data management.

Thank You to Our Customers and Partners

"We sincerely appreciate every customer who has shared their experience and supported Vinchin on G2," said Vinchin. "These recognitions represent more than awards — they reflect the trust our users place in us and motivate us to continue innovating in data protection technology."
Vinchin remains committed to empowering businesses worldwide with secure, efficient, and resilient backup and recovery solutions.

"Help! My company runs some Linux servers, and what worries me most is that scheduled backups still only run at fixed intervals. On production Linux servers, databases, logs, and application files keep changing all the time, so there's always a risk of missing the latest data before the next backup runs. Any suggestions?"

This is a common concern for fast-changing Linux workloads. To address this challenge, many organizations are turning to Linux continuous backup solutions that automatically capture data changes as they occur.

In this article, we will explore what continuous backup is, the benefits of continuous backup, and three common methods to implement continuous backup.

What Is Linux Continuous Backup?

Linux continuous backup is a data protection method that captures changes on Linux servers as they happen, instead of waiting for a scheduled backup window. Unlike traditional full backups, which copy all data at set intervals, or incremental backups, which save changes since the last backup, continuous backup keeps recording new writes in near real time. 

This helps protect frequently updated files, databases, and application data, so businesses can recover to a more recent point after accidental deletion, corruption, or system failure.

Why Production Linux Servers Need Continuous Backup?

Production Linux servers often run critical databases, business applications, and customer-facing services. Since data changes constantly, periodic backups may leave important updates unprotected. This is where continuous data protection (CDP) helps:

1. Minimize Data Loss

CDP captures changes as they happen, helping recover the most recent files, databases, logs, and application data after deletion, corruption, or failure.

2. Recover Faster from Disruptions  

With more recovery points, IT teams can restore Linux workloads closer to the latest server state and reduce downtime.

3. Protect Fast-Changing Workloads

CDP is better suited for servers with frequent writes from applications, transactions, and system processes.

4. Reduce Business Risks  

It helps protect service availability, customer trust, and compliance-related recovery objectives.

3 Common Ways to Implement Linux CDP

There are three mainstream implementations for Linux Continuous Data Protection (CDP). The first two leverage built-in Linux utilities, whereas the third adopts professional dedicated CDP software. While all three mitigate data loss risks, only purpose-built CDP tools deliver real-time data capture, granular recovery points, and streamlined management for enterprise Linux production workloads.

1. Snapshot-Based Protection

Create and mount LVM snapshots with the native commands below:

lvcreate -s -n data_snap -L 5G /dev/vg0/data 
mount /dev/vg0/data_snap /mnt/snap

Automate hourly snapshot tasks via cron with this rule: 0 * * * * /usr/local/bin/create_snapshot.sh. Though snapshots support point-in-time restoration, they operate on fixed cycles. Any new data generated between two snapshots remains unprotected, and frequent snapshots quickly exhaust storage under heavy business loads. This approach merely serves as a temporary recovery buffer and cannot qualify as genuine Linux CDP.

2. Replication-Based Protection

Set up DRBD replication with these basic commands:

drbdadm create-md r0 
drbdadm up r0 
drbdadm primary r0

Data replication duplicates your workload to a secondary server or offsite storage to boost system availability and disaster resilience. Its major flaw is blind full mirroring: accidental deletion, file corruption, or ransomware damage will be synced to the replica before you respond. Replication also brings complicated failover configuration and fails to offer the precise rollback controls demanded by production Linux services.

3. Dedicated Continuous Data Protection Software

Specialized CDP software records every data modification in real time instead of relying on scheduled backup cycles. For Linux CDP scenarios, this translates to second-level recovery granularity, unified policy management, clear data change logs, and one-click restoration for databases, logs and core business data. It delivers the most comprehensive continuous backup solution for high-churn production Linux environments.

For enterprises pursuing scalable, reliable Linux CDP, dedicated backup software stands as the optimal choice — and Vinchin Backup & Recovery is a mature, all-in-one solution built for this exact demand.

Built for real-time server CDP, it helps reduce data loss, shorten recovery time, and keep business workloads recoverable when disruption happens.

Real-Time Server Backup

Vinchin records server disk I/O changes in real time, helping Linux continuous backup achieve near-zero RPO. This protects frequently changing databases, files, and application data.

Centralized CDP Management

A web-based console lets administrators configure CDP tasks, monitor processes, and receive alerts, notifications, and reports across multiple environments.

Linux Support and Ransomware Protection

Vinchin supports major Linux distributions, including RHEL, CentOS, Oracle Linux, Rocky Linux, and Ubuntu. It can also enable storage protection to help defend CDP backup data against ransomware attacks.

The following steps demonstrate how Vinchin continuously protects your business with a simple and efficient workflow.

Step 1: Navigate to Resources > Infrastructure > Agent > Add to add your server to Vinchin. 

Step 2: Click the Download button and install the agent on the server.

Step 3: Click CDP > Server and select the server, application, and volumes you want to protect.

Step 4: Choose the backup destination by selecting the target storage and node.

Step 5: Configure backup strategies, including labeling policy, retention policy, and so on.

Step 6: Confirm and submit the task.

FAQs About Linux Continuous Backup

Q1: Can Linux continuous backup protect a database while it is still running?

A1: Yes, but the backup method must keep data consistent. For databases, simple file copy is often not enough because files may change during backup. It is better to use application-aware backup, database snapshots, or transaction log protection.

Q2: Will continuous backup also copy corrupted or deleted data?

A2: It can, depending on the method. Real-time replication may copy bad changes quickly. A good CDP solution should keep multiple recovery points, so you can roll back to a clean version before deletion, corruption, or ransomware activity.

Q3: Does Linux continuous backup affect server performance?

A3: It may add some CPU, disk I/O, and network load, especially on busy production servers. To reduce impact, use efficient change tracking, compression, bandwidth control, and monitor backup performance regularly.

Q4: How long should Linux continuous backup recovery points be retained?

A4: Retention depends on storage capacity, compliance needs, and recovery goals. Many businesses keep frequent short-term recovery points for quick rollback and longer-term backups for audit, ransomware recovery, or historical restore.

Final Thoughts

Linux continuous backup helps protect fast-changing production data, but native methods have limits: snapshots are periodic, and replication may sync bad changes before they are detected.

For enterprises that need finer recovery points and easier management, dedicated continuous data protection software is the better choice. Vinchin Backup & Recovery helps build a reliable Linux continuous data protection strategy with real-time backup, point-in-time recovery, failover, and ransomware protection.

Hyper-V boot failure may occur due to incorrect boot settings, missing boot images, corrupted VHD/VHDX files, or VM conversion issues. Errors such as "Hyper-V boot image was not found" and "Hyper-V boot failure reboot and select proper boot device" are common symptoms. 

In some cases, administrators may also encounter Disk2vhd not booting issues after converting physical machines into Hyper-V virtual machines.

This article outlines five typical causes of Hyper-V boot failures and provides clear, step-by-step troubleshooting solutions to help IT admins resolve boot errors efficiently.

5 Common Causes of Hyper-V Boot Failure and Fixes

The following are five common causes of Hyper-V boot failure and practical fixes to help administrators troubleshoot the issue.

Issue 1. Incorrect Boot Order or Firmware Configuration

Cause:

Incorrect boot settings are one of the most common reasons why a Hyper-V VM cannot start. The virtual machine may attempt to boot from an incorrect device, such as a network adapter or an empty disk, instead of the operating system disk. 

In this situation, users may see the error message “Hyper-V boot failure reboot and select proper boot device”, which indicates that the VM cannot find a valid bootable device.

This issue can also occur when the VM generation does not match the operating system disk format. For example, Generation 2 VMs require UEFI firmware and GPT disks, while Generation 1 VMs use BIOS firmware and support MBR disks.

Fix: 

Check and adjust the VM boot order in Hyper-V Manager:

Step 1: Open Hyper-V Manager.

Step 2: Right-click the affected VM and select Settings.

Step 3: Navigate to Firmware (Generation 2 VM) or BIOS (Generation 1 VM).

Step 4: Move the system disk or correct boot device to the top of the boot order.

Step 5: Save the changes and restart the VM.

If the VM was created with the wrong generation, create a new VM with the correct generation and attach the existing VHD/VHDX file.

For Generation 2 VMs, verify that the disk uses GPT partition style. You can check it with Disk Management or the following command after attaching the disk:

Get-Disk | Select Number, PartitionStyle

Issue 2. Hyper-V Boot Image Was Not Found

Cause:

The error "Hyper-V boot image was not found" usually means Hyper-V cannot locate a valid boot disk. This may happen when the VHD/VHDX file is moved, renamed, disconnected, or the VM configuration points to an incorrect disk path.

It can also occur when the virtual disk exists, but the Windows boot files are damaged.

Fix:

Check the VM storage configuration:

Step 1: Open Hyper-V Manager.

Step 2: Go to VM Settings > Hard Drive.

Step 3: Verify that the attached VHD/VHDX file exists.

If the boot files are corrupted, start the VM with Windows installation media and repair the boot configuration:

bootrec /rebuildbcd

For UEFI-based systems, use:

bcdboot C:\Windows /f UEFI

Issue 3. Corrupted VHD/VHDX Prevents Hyper-V VM from Booting

Cause:

A corrupted VHD/VHDX file can stop Hyper-V from accessing the operating system and cause the VM to fail during startup. Common causes include unexpected shutdowns, storage failures, or interrupted migration processes.

Fix:

Use the Hyper-V PowerShell command to check and repair the virtual disk:

Repair-VHD -Path "D:\VMs\Server01.vhdx"

If the disk cannot be repaired, mount the VHD/VHDX on another system and use disk repair tools such as:

chkdsk /f

Administrators should also verify that the Hyper-V host has enough free storage space to avoid further disk issues.

Issue 4. Disk2vhd Not Booting After Conversion to Hyper-V VM

Cause:

After converting a physical machine with Disk2vhd, the generated VM may experience Disk2vhd not booting issues because the virtual hardware configuration does not match the original system. Common problems include incorrect VM generation, incompatible disk partition style, or missing boot configuration.

Fix:

Check whether the Hyper-V VM generation matches the converted disk:

• Generation 1: MBR disk with BIOS firmware

• Generation 2: GPT disk with UEFI firmware

If the VM cannot boot after conversion, repair the boot files from Windows recovery mode:

bootrec /rebuildbcd

For UEFI systems:

bcdboot C:\Windows

Issue 5. Insufficient Permissions or Storage Issues

Cause:

Hyper-V may fail to start a VM when the Hyper-V service cannot access VM configuration files or VHD/VHDX storage locations. This commonly happens after manually moving VM files or storing them in locations with incorrect permissions.

Insufficient disk space can also prevent Hyper-V from starting because it cannot write configuration data or expand virtual disks.

Fix:

Check the permissions of the VM folder and ensure that the Hyper-V service has access rights. You can also reset permissions using:

icacls "D:\Hyper-V\VM01" /grant "SYSTEM:(OI)(CI)F"

Then verify available storage space and restart the Hyper-V Virtual Machine Management service:

Restart-Service vmms

Prevent Data Loss: Back Up Hyper-V VMs In Advance

Although most Hyper-V boot failures can be resolved with the troubleshooting methods covered above, some severe faults may remain unfixable. Beyond boot errors, virtual machines constantly face threats like disk damage, storage breakdowns, and system malfunctions. 

In this case, backing up Hyper-V VMs in advance provides an additional protection layer and helps administrators restore virtual machines when critical issues occur and reduce downtime.

1. Quickly Restore Failed Virtual Machines

When a Hyper-V VM cannot boot properly, restoring from an available backup allows administrators to recover the previous working state without spending excessive time troubleshooting complex issues.

2. Protect VM Data from Unexpected Failures

VM failures may happen due to hardware problems, software errors, or accidental operations. Regular backups help protect important applications, configurations, and business data from unexpected incidents.

3. Maintain Multiple Recovery Points

Keeping multiple backup versions allows administrators to choose the most suitable recovery point based on the failure time. This helps avoid restoring corrupted or unwanted VM states and provides more flexible recovery options.

Protect Data of Hyper-V with Vinchin Backup & Recovery

Vinchin Backup & Recovery is designed to provide centralized and efficient VM protection for Hyper-V environments with agentless backup technology. It eliminates the need to install backup agents inside each virtual machine, reducing deployment and maintenance workloads.

With Vinchin Backup & Recovery, administrators can create automated Hyper-V VM backup jobs with flexible schedules, including full and incremental backup strategies. Features such as deduplication, compression, backup encryption, and backup storage optimization help improve backup efficiency while reducing storage consumption.

For organizations managing multiple virtualization environments, Vinchin also provides centralized management through a unified web console, enabling administrators to manage backup tasks from a single platform. This makes Hyper-V backup and recovery easier to configure and maintain, especially in large virtual environments.

Follow these steps to create a Hyper-V VM backup task in Vinchin Backup & Recovery:

Step 1: Navigate to Resource > Infrastructure > Virtual Platform, and add the Hyper-V host with the required credentials.

Step 2: Go to Backup > Virtualization and select the Hyper-V virtual machines that need protection.

Step 3: Choose the target node and storage location for the backup destination. External drives can be added to the system beforehand and selected here as the target storage.

Step 4: Configure backup settings, including backup schedule, retention policy, and so on.

Step 5: Review and confirm the task.

FAQs About Hyper-V Boot Failure

Q1: Why did my Hyper-V VM fail to boot after a Windows update?

A1: Some Windows updates may modify system files, drivers, or boot configurations. Try entering recovery mode, uninstalling recent updates, or restoring the VM to an earlier recovery point.

Q2: Can Hyper-V checkpoints cause VM boot problems?

A2: Yes. Problems with checkpoint chains or failed merges can affect VM startup. Remove unnecessary checkpoints and ensure that checkpoint merge operations complete successfully.

Q3: Why does my Hyper-V VM boot slowly and eventually fail?

A3: Slow boot failures may be caused by insufficient CPU, memory, storage performance, or startup services. Check resource usage and Hyper-V event logs for possible bottlenecks.

Q4: Can antivirus software cause Hyper-V VM boot issues?

A4: In some cases, security software may block access to VM files or interfere with virtualization services. Check security logs and create appropriate exclusions if needed.

Final Thoughts

Hyper-V boot failure can occur due to various reasons, including firmware configuration issues, missing boot images, corrupted virtual disks, or failed VM conversions. While troubleshooting can resolve many startup problems, it cannot eliminate all unexpected risks.

Creating Hyper-V VM backups before failures occur is a reliable way to protect critical data. With proper backups, administrators can quickly restore affected virtual machines, reduce downtime, and maintain business continuity when unexpected issues happen.

Many organizations migrate Oracle VM to VMware to achieve better scalability, easier management, and stronger ecosystem support. VMware provides several advantages for enterprises, including:

Broader Virtualization Ecosystem

VMware has a more mature and widely adopted virtualization ecosystem, with extensive support from hardware vendors, software providers, cloud platforms, and enterprise applications. This makes it easy for organizations to expand their infrastructure and maintain long-term compatibility.

More Mature Management with vCenter

VMware provides centralized management through vCenter Server, allowing administrators to efficiently manage multiple hosts and virtual machines. Advanced features such as vMotion, High Availability (HA), and Distributed Resource Scheduler (DRS) help improve operational efficiency and resource utilization.

Richer Backup and Disaster Recovery Support

Compared with Oracle VM, VMware has a larger ecosystem of third-party backup and disaster recovery solutions. Organizations can benefit from features such as image-based backup, incremental backup, VM replication, and instant recovery to improve business continuity.

Better Third-Party Compatibility

VMware is widely supported by enterprise storage, networking, security, monitoring, and automation solutions. Migrating to VMware provides greater flexibility when integrating with existing IT environments and adopting new technologies.

Overall, moving from Oracle VM to VMware helps enterprise to build a more scalable, manageable, and reliable virtualization infrastructure.

Method 1: Export Oracle VM and Import to VMware

This is the most straightforward migration methods. Oracle VM allows administrators to export VMs as OVA/OVF packages, which can be then imported into VMware environments. It is suitable for small-scale migration with a limited number of virtual machines.

Step 1: export VM from Oracle VM

1. Log into Oracle VM Manager;

2. Select the target virtual machine;

3. Shut down the VM to ensure data consistency;

4. Export the VM as an OVA/OVF package to a storage location.

Step 2: convert or import the VM into VMware

1. Open VMware vSphere Client ot VMware Workstation;

2. Select Deploy OVF Template;

3. Upload the exported OVA/OVF file;

4. Configure the VM name, storage, network, and other settings.

5. Complete the deployment and power on the VM.

Step 3: verify the migrated VM

• Check whether the operating system boots correctly

• Install VMware tools if required

• Verify network configuration and application services

Method 2: Migrate Oracle VM to VMware via Backup & Restore

Backup-based migration is a safer approach that allows you to move Oracle VM workloads to VMware while keeping an additional recovery point. It is recommended for production environments where data protection and migration reliability are important.

There are huge numbers of enterprise backup solutions in the market, and Vinchin Backup & Recovery stands out for its wide compatibility across 15+ virtualization platforms, including VMware, Proxmox, Hyper-V, OLVM, XenServer, Openstack, etc), and the unparalleled granular and instant restore capabilities.

Vinchin adopts immutable backup storage throughout the VM backup and restore process, and it enables V2V live migration without affecting the production environments, reducing the data and revenue loss to a minimum. Furthermore, administrators can monitor the running jobs simultaneously through the web console to prevent the accidental failures.

Step 1: First, install and open the Vinchin Backup & Recovery software, and go to Backup > Virtualization to select the source Oracle VM host and create a backup.

Step 2: Then, go to Data Resilience > Restore to choose the Oracle VM backup storage as the recovery point.

Step 3: Next, choose the target host and VM configurations to complete the restore destinations.

Step 4: create a restore strategy. Schedule the restore time and set the throttling policy, transmission, security, and advanced strategies.

Step 5: Review all the options, and then tab Submit to activate the task. Minutes later, you’ll see the original Oracle VM data restored on the new VMware VM.

Vinchin Backup & Recovery specializes in enterprise disaster recovery and data protection. If your organization is planning a migration and values reliability and scalability, Vinchin can be a trusted choice. You can start with a 60-day fully featured free trial to evaluate its capabilities and see how it addresses your migration and data protection needs.

Method 3: Manual Virtual Disk Conversion

Manual conversion is useful when you only need to migrate the virtual disk and recreate the VM configuration. Oracle VM commonly use RAW image files (.img) as virtual disks, which need to be converted into VMware-compatible VMDK format.

Step 1: locate the Oracle VM virtual disk

Find the VM disk image file, usually in RAW format:

Vm_disk,img

Copy the disk image to a machine with conversion tools installed.

Step 2: Convert RAW image to VMDK

Use qemu-img to convert the RAW disk image:

qemu-img convert -f raw -o vmdk vm_disk.img vm_disk.vmdk

After conversion, you will get a VMware-compatible VMDK file.

Step 3: Create a new VM in VMware

1. Create a new virtual machine in vSphere/ESXi.

2. Select the same operating system type.

3. Remove the default virtual disk.

4. Attach the converted VMDK file.

5. Power on the VM and verify functionality.

Step 4: Fix compatibility issues if needed

• Install VMware tools

• Update disk controllers if the VM fails to boot

• Reconfigure network adapters

 Note: for large-scale Oracle VM to VMware migration, backup-and-restore or automated V2V migration methods are preferred because they reduce downtime and simplify VM conversion compared with manual export/import approaches.

Migrate Oracle VM to VMware FAQs

Q1: Can I directly convert Oracle VM disk files to VMware VMDK?

Yes. Oracle VM virtual disks can be converted into VMware-compatible VMDK files using tools such as qemu-img. After conversion, you can create a new VMware virtual machine and attach the converted VMDK disk.

Q2: Can I migrate multiple Oracle VM machines to VMware at the same time?

Yes. For environments with multiple virtual machines, using backup-based migration or automated V2V migration tools is more efficient than manually converting each VM. These methods allow administrators to migrate workloads in batches and simplify migration management.

Q3: What problems may occur after migrating Oracle VM to VMware?

Common post-migration issues include boot failures, missing network adapters, incorrect disk controller settings, and driver compatibility problems. Installing VMware Tools, checking VM hardware settings, and verifying network configurations can help resolve most issues.

The Bottom Line

Migrating Oracle VM to VMware helps organizations adopt a more mature virtualization platform with better management, compatibility, and backup support. Choosing the right migration method, such as export/import, backup restore, disk conversion, ensures a smoother transition. Vinchin Backup & Recovery provides reliable backup, recovery, and VM migration capabilities to help minimize downtime and protect critical workloads.

The good news: there are real, documented workarounds. The right one depends on what kind of device you’re dealing with and how your environment is set up. Let’s break it down.

Quick Comparison: Which Method Should You Use?

Method 1. Enhanced Session Mode (Recommended Starting Point)

Enhanced Session Mode (ESM) was introduced in Windows Server 2012 R2 and Windows 8.1. It uses an RDP-based channel under the hood to redirect local devices, including USB drives, from your client machine into the VM when you connect through Hyper-V Manager. For most day-to-day use cases, this is the simplest path.

Prerequisites

ESM is only supported on Generation 2 VMs. The guest OS must be Windows Server 2016/2019/2022/2025, Windows 10, or Windows 11. You’ll also need the Hyper-V host to be running Windows Server 2012 R2 or later.

Step 1. Enable Enhanced Session Mode on the Host

Open Hyper-V Manager, right-click the host, and select Hyper-V Settings.

Under the Server section, click Enhanced Session Mode Policy and check Allow enhanced session mode. 

Then under User, click Enhanced Session Mode and check Use enhanced session mode. 

Alternatively, you can do this in one PowerShell command:

Set-VMHost -EnableEnhancedSessionMode $true

Then restart the VM Management service:

Get-Service vmms | Restart-Service

Step 2. Enable Guest Services in VM Integration

In the VM’s settings panel, go to Integration Services and make sure Guest Services is checked.

Step 3. Redirect the USB Device

When you connect to the VM via VMConnect, a configuration panel will appear before the VM session starts.

Click Show Options > Local Resources > More, and check the box next to your USB drive. 

From that point, the drive appears inside the VM as if it were locally attached.

Method 2. RDP Redirection (Best for Remote or Network Access)

If you’re managing a VM remotely or Enhanced Session Mode isn’t available in your configuration, Remote Desktop Protocol (RDP) redirection is a solid alternative. RDP supports both high-level device redirection (optimized by device class, like cameras or printers) and low-level raw USB forwarding for devices that need their own driver stack.

Enable Remote Desktop on the Guest VM

1. Open Control Panel > System and Security > Allow remote access inside the VM. 

2. Check both Allow Remote Assistance connection and Allow remote connections to this computer. Click OK.

 

3. On your client machine, press Win + R, type mstsc, and press Enter.

4. Click Show Options > Local Resources > More.

5. Expand Other supported plug-and-play (PnP) devices and check your USB device, then click OK.

6. Enter the VM’s IP or hostname, connect, and sign in. The USB device will appear under “Redirected” resources in the session.

To enable low-level USB redirection (needed for dongles or non-standard devices), open Group Policy on the client:

Gpedit.msc > Computer Configuration > Administrative Templates > Remote Desktop Services > Remote Desktop Connection Client, then enable Allow RDP redirection of other supported RemoteFX USB devices.

Method 3. Offline Disk Passthrough via SCSI Controller

This is the most direct method for USB mass storage, essentially attaching the physical disk to the VM as if it were an internal drive. The trade-off is that the device must be taken offline from the host OS first, and this approach only works for fixed storage (flash drives and removable media flagged as “removable” by Windows won’t work without a workaround).

1. Plug the USB drive into the Hyper-V host. Let Windows assign it a drive letter.

2. Open Disk Management (diskmgmt.msc), right-click the USB disk, and select Offline. The host OS will no longer see the drive. 

3. Open Hyper-V Manager, right-click the target VM, and choose Settings.

4. In the left pane, select SCSI controller, then choose Hard Drive and click Add. 

5. Under Hard Drive, click Physical hard disk and select your USB drive from the dropdown. Click OK.

The VM will recognize the USB storage immediately (no reboot needed when using SCSI). To reverse the process, go back to SCSI Controller > Hard Drive > select the drive > click Remove, then bring the disk back online in Disk Management on the host.

What About DDA (Discrete Device Assignment)?

Discrete Device Assignment (DDA) is an advanced option that passes an entire PCIe USB controller directly into a VM, giving the guest native ownership of every device connected to that controller.

But it does not provide a generic USB passthrough. Most consumer USB controllers are not compatible with DDA. Therefore, DDA is usually not the answer for attaching a USB flash drive or USB dongle.

Once the Data Is in the VM - Don’t Leave It Unprotected

Passing files into a Hyper-V VM via USB is just the first step. What you need to do next is protect your VM data security.

Vinchin Backup & Recovery is purpose-built for virtualized environments and covers the full protection lifecycle for your Hyper-V infrastructure and beyond.

• Agentless image-based backup

• Forever incremental backup

• Granular (file-level) recovery

• Deduplication & compression

Easy steps to back up Hyper-V VMs:

Step 1. Select the Hyper-V VM under Backup > Virtualization.

Step 2. In the Backup Destination tab, choose the backup storage.

Step 3. In the Backup Strategies tab, configure the desired strategies.

Step 4. Review and confirm the backup settings are correct, and click Submit.

Choose Vinchin as your data protection tool? Click the following button to get the full feature free trial for 60 days!

FAQs

Q1: Can I pass through a USB dongle (license key) to a Hyper-V VM?

Not natively. USB security dongles (HASP, Sentinel, etc.) require low-level driver access that neither Enhanced Session Mode nor RDP high-level redirection can always provide reliably. The offline disk method doesn’t apply to dongles either.

Q2: Does Hyper-V support webcams and USB cameras?

Support is limited. Some webcams can be redirected through RDP or Enhanced Session Mode, but compatibility varies depending on the device and driver implementation.

Q3: Will attaching a USB drive as a pass-through disk affect VM snapshots?

Yes, significantly. Pass-through disks (physical disks attached via SCSI controller) are excluded from Hyper-V checkpoints and cannot be included in VM exports or live migrations. 

Conclusion

Passing a USB device to a Hyper-V virtual machine isn't as simple as plugging in a cable, but it's far from impossible. For most administrators, Enhanced Session Mode covers daily needs with the least configuration overhead. RDP redirection adds flexibility when you're managing VMs over a network. And the offline SCSI method remains a reliable fallback for bulk storage transfer when network methods aren't appropriate.

Whatever data ends up in your VMs after a USB transfer deserves the same protection as anything else in your virtual infrastructure: regular, verified backups with fast recovery options.

Live VM migration is a process of moving a running virtual machine from one physical host to another with minimal service interruption. 

Unlike cold migration, which requires shutting down the VM first, live migration keeps applications available during the transfer, making it suitable for maintenance, resource optimization, and infrastructure changes.

How Does Live VM Migration Work?

Live VM migration typically involves several steps to move a running VM between physical hosts with minimal interruption.

Step 1: Pre-migration Preparation

The hypervisor checks the target host's CPU, memory, storage, and network resources to ensure the migration can be completed successfully.

Step 2: Memory Transfer

The VM's memory pages are copied to the destination host while the VM continues running. Changed data is transferred repeatedly until synchronization is complete.

Step 3: Switchover and Verification

The VM is briefly paused to transfer the remaining state, including CPU and device information, then resumed on the new host. Administrators can verify network connectivity and application availability after migration.

Benefits of Live VM Migration

Live VM migration improves availability, flexibility, and resource utilization in virtualized environments. Key benefits include:

Reduce Downtime:

Keeps VMs running during migration to minimize service interruptions.

Hardware Maintenance Without Service Interruption:

Allows administrators to perform maintenance or upgrades without shutting down workloads.

Load Balancing:

Redistributes workloads across hosts to improve resource usage and performance.

Disaster Recovery Support:

Enables faster workload relocation to maintain business continuity during failures.

How to Achieve Live VM Migration?

There are two common ways to perform live VM migration: using native migration technologies provided by hypervisors or using third-party VM migration software

Native tools are suitable for environments running on a single virtualization platform, while third-party solutions provide more flexible migration capabilities, centralized management, and additional data protection features.

The right method depends on your virtualization environment, migration requirements, and the level of protection needed before moving production workloads.

Method 1: Use Native Hypervisor Migration Tools

Most virtualization platforms provide built-in live migration technologies that allow administrators to move running virtual machines between hosts with minimal downtime. These native tools are tightly integrated with the hypervisor and are commonly used for planned maintenance, resource balancing, and infrastructure optimization.

Popular examples include VMware vMotion, Hyper-V Live Migration, and Proxmox Live Migration. In this guide, we will use VMware vMotion live migration as an example to demonstrate how native hypervisor migration tools work. 

VMware vMotion Live Migration

Step 1: Log in to vCenter Server

Open the vSphere Client and log in to vCenter Server. Navigate to the virtual machine inventory and locate the VM that needs to be migrated.

Step 2: Select the Target VM and Start Migration

Right-click the VM, select Migrate, and choose the migration option. For live migration between hosts, select Change compute resource only.

Step 3: Select the Destination ESXi Host

Choose the target ESXi host where the VM will run. vCenter will check resource availability, network configuration, and compatibility before proceeding.

Step 4: Review and Complete the Migration

Review the migration settings and click Finish to start the vMotion process. The VM remains running during migration and resumes operation on the destination host after completion.

Besides VMware vMotion, other virtualization platforms also provide built-in live migration technologies for moving running virtual machines with minimal downtime.

For Microsoft virtualization environments, Hyper-V Live Migration allows administrators to move running VMs between Hyper-V hosts without shutting down workloads. It is commonly used for server maintenance, hardware upgrades, and workload balancing. 

For Linux-based virtualization environments, Proxmox Live Migration enables administrators to migrate running VMs between Proxmox VE nodes with minimal service interruption. It is often used in cluster environments for resource optimization and infrastructure maintenance. 

Method 2: Use Third-Party VM Migration Software

While native hypervisor migration tools work well within the same platform, they are often limited by platform compatibility and lack advanced features such as batch migration and centralized management. Third-party VM migration software provides a more flexible solution for complex migration scenarios.

Vinchin Backup & Recovery supports agentless VM migration and X2X migration, enabling seamless workload movement across platforms such as VMware, Hyper-V, Proxmox, oVirt, XCP-ng, XenServer, and OpenStack without installing agents inside guest systems.

With Vinchin, migrating multiple VMs to another host is simple. After backing up the VMs, follow the steps below to complete the migration.

Step 1: Select the source machine that you want to migrate.

Step 2: Select the target host that you want to move the VM to.

Step 3: Set up the migration strategies according to your business.

Step 4: Review and confirm the migration task.

Download Vinchin Backup & Recovery and start your 60-day free trial to perform agentless VM migration across heterogeneous environments and move workloads between VMware, Hyper-V, Proxmox, and other virtualization platforms.

Common Live VM Migration Issues and Fixes

Live VM migration reduces downtime, but it can still fail if networks, storage, resources, or applications are not ready.

Here are some common live VM migration issues and practical fixes:

1. Network Connectivity Issues

Problem: After migration, the VM may lose access to the gateway, DNS, or application users because the destination host uses different VLANs, port groups, virtual switches, firewall rules, or routes.

Solution: Compare source and target network settings before migration. For vMotion live migration, verify the vMotion network and VM port group on the target ESXi host. For Hyper-V live migration and KVM live migration, check virtual switch, bridge, firewall, and routing settings.

2. Storage Compatibility Problems

Problem: Migration may fail when the target host cannot access the VM disks, datastore, SMB share, NFS mount, iSCSI volume, or storage pool.

Solution: Confirm shared storage access and free space before migration. Remove unnecessary snapshots or checkpoints to reduce transfer time and avoid storage conflicts.

3. Insufficient Host Resources

Problem: The target host may not have enough CPU, memory, bandwidth, or storage I/O to run the migrated VM.

Solution: Check host utilization in advance, keep enough resource headroom, avoid concurrent migrations of heavy workloads, and schedule live VM migration outside peak hours.

4. Application Interruption

Problem: Some applications may be affected by a short pause, network reconnection, or locked files during switchover.

Solution: Prepare a post-migration test plan. Verify login, database connections, file access, scheduled tasks, and service logs. For critical workloads, keep a recent VM backup and rollback plan ready.

Even with these fixes, migration still carries risks, so it is better to back up important data or the entire VM before starting live VM migration.

FAQs About VMs Live Migration

Q1: Should backup jobs run during live migration?

A1: Avoid running heavy backup jobs during migration if possible. Backup and migration both consume network, storage, and CPU resources, which may slow the process.

Q2: Is live migration the same as failover?

A2: No. Live migration is usually a planned operation, while failover responds to host or site failure. For disaster recovery, you still need backup or replication.

Q3: Does live migration move VM disks too?

A3: Not always. Some migrations only move the running VM to another host while the disks stay on shared storage. If the VM disks also need to move, use storage migration or a migration mode that copies storage.

Q4: What is the difference between Hyper-V live migration and quick migration?

A4: Live migration is for near-continuous service, while quick migration is faster to execute but causes service interruption.

Sum Up

Live VM migration helps move running VMs between hosts with minimal downtime, making it useful for maintenance, load balancing, and infrastructure changes. However, network, storage, resource, and application issues can still affect migration success.

Vinchin Backup & Recovery simplifies VM migration with flexible migration workflows, centralized management, and support for moving workloads across different virtualization environments. 

An incremental backup in Linux saves only the data that has changed since the last backup, instead of copying the entire system every time. Compared with a full backup, which creates a complete copy of all selected files, an incremental backup is faster and more storage-friendly because each backup job transfers only new or modified data. 

Why Businesses Need Incremental Backup?

For businesses, backup is not just a routine IT task. It directly affects uptime, storage cost, and recovery readiness. Full backups are important, but running them too frequently can create several problems:

• Rapid data growth makes daily full backups harder to complete.

• Long backup windows may affect applications and business operations.

• Repeated copies of unchanged data consume unnecessary storage.

• Remote or cloud backup jobs can create heavy network traffic.

• Strict RPO or RTO requirements.

Incremental backup helps address these challenges by reducing the amount of data transferred in each backup job. As a result, businesses can run backups more frequently, use storage more efficiently, and improve recovery planning.

4 Linux Incremental Backup Tools Compared

When choosing Linux incremental backup software, many users start with free or native methods, such as rsync scripts, file system snapshots, or open-source tools. These options can work well in simple environments, but they often require manual scheduling, retention management, monitoring, restore testing, and troubleshooting. 

Vinchin Backup & Recovery offers a more centralized approach with incremental and forever incremental backup, scheduling, retention policies, alerts, deduplication, compression, encryption, and recovery verification for Linux workloads in physical and virtual environments.

Below, we compare Vinchin with three common free Linux incremental backup methods: backup scripts, file system or volume snapshots, and open-source backup tools, so you can choose the right option for your environment.

1. Vinchin Backup & Recovery

Vinchin Backup & Recovery is designed for businesses that need centralized Linux data protection. Users can create and manage backup tasks from one console, apply backup strategies, monitor job status, and restore data when needed.

It is a strong choice for organizations that manage multiple Linux servers, virtual machines, or hybrid environments. Features such as incremental backup, forever incremental backup, deduplication, compression, encryption, retention policies, alerts, and recovery verification help businesses reduce backup complexity and improve restore reliability.

Best for:

Businesses that need centralized backup management, automated scheduling, stronger security, and predictable recovery for Linux workloads.

2. Linux Incremental Backup Script

A Linux incremental backup script is a free and lightweight way to back up changed files with native tools such as rsync. After the first backup, the script can copy only new or modified files to the backup destination.

This method is flexible and easy to start, but it depends heavily on manual setup. Users need to write or adjust scripts, configure schedules, manage backup destinations, check job results, and test restores by themselves.

Best for:

Personal servers, small environments, or technical users who need a free and customizable backup method.

3. File System or Volume Snapshots

File system and volume snapshots provide a fast way to capture the state of Linux data at a specific point in time. Common options include LVM snapshots, Btrfs snapshots, and ZFS snapshots.

Snapshots are useful for quick rollback and short-term recovery. They can help users recover files or return a system to an earlier state quickly. However, snapshots are usually stored close to the production environment, so they should not be treated as a complete backup strategy by themselves.

Best for:

Systems that need frequent recovery points and fast rollback, especially when snapshots are also copied or replicated to independent storage.

4. Open-Source Linux Incremental Backup Tools

Open-source Linux incremental backup tools, such as BorgBackup, Restic, and Duplicity, usually support features such as deduplication, compression, encryption, and remote backup.

These tools provide more backup capabilities than simple scripts and are often a good fit for technical users who want free software with strong control over backup repositories and retention policies. However, they still require command-line knowledge and ongoing maintenance.

Best for:

Small to medium Linux environments with technical administrators who want a free, flexible, and secure backup tool.

In short, each Linux incremental backup method serves a different need. Scripts, snapshots, and open-source tools work well for technical users and smaller environments, while Vinchin is better for businesses that need centralized management, automation, stronger protection, and more reliable recovery.

How Vinchin Performs Incremental Backup in Linux

This section shows how to add Linux machines in virtual environments to Vinchin Backup & Recovery and create an incremental backup job step by step.

Step 1: Click Resources > Infrastructure > Virtual Platform to add your Linux machine.

Step 2: Click Backup > Virtualization and select the Linux machine you added.

Step 3: Select the backup destination by choosing the target storage and node.

Step 4: Configure the backup strategy. You can set an incremental backup schedule, data storage policy, retention policy, and more.

Step 5: Review and confirm your backup configurations and submit the backup task.

With a 60-day free trial, Vinchin Backup & Recovery allows you to test centralized Linux incremental backup, automated scheduling, and reliable recovery before deployment. Download the software to see how it can simplify Linux workload protection in your environment.

Best Practices for Linux Incremental Backup

No matter which method you choose, a reliable Linux incremental backup strategy should follow several best practices:

• Keep at least one backup copy on independent storage.

• Do not rely only on local snapshots for disaster recovery.

• Encrypt backups that contain sensitive business data.

• Set clear retention policies to avoid uncontrolled storage growth.

• Monitor backup jobs and investigate failures promptly.

• Test restores regularly instead of assuming backups are usable.

• Combine full, incremental, and offsite backup strategies based on recovery needs.

These practices help reduce data loss, prevent backup storage from growing silently, and make recovery more predictable. For business workloads, document backup schedules, ownership, and restore steps so teams can respond quickly during outages or security incidents.

FAQs About Linux Incremental Backup Software

Q1: How can I reduce Linux backup storage usage?

A1: Use incremental backup, deduplication, compression, and clear retention policies. You should also exclude temporary files, caches, logs that do not need long-term retention, and unnecessary system directories.

Q2: Is open-source Linux backup software enough for business use?

A2: Open-source tools like BorgBackup, Restic, and Duplicity can work well for small or technical teams. However, businesses that manage multiple servers usually need centralized monitoring, alerts, reporting, and easier recovery workflows, which are often better handled by enterprise backup software.

Q3: Can Linux incremental backup software back up to remote or cloud storage?

A3: Yes. Many tools, such as Vinchin Backup & Recovery, support remote backup targets such as SSH servers, NAS devices, object storage, or cloud platforms. 

Conclusion

Linux incremental backup is an efficient way to protect business data while reducing backup time, storage usage, and network load. Scripts, snapshots, open-source tools, and enterprise backup software can all be used to perform incremental backup in Linux, but they serve different needs.

For small environments, scripts or open-source tools may provide enough flexibility. For systems that require fast rollback, snapshots are helpful. For organizations that need centralized management, reliable recovery, and scalable protection, enterprise Linux incremental backup software provides a more complete and business-ready solution.

As an alternative to VMware Workstation, Microsoft Hyper-V provides a reliable virtualization platform with strong integration with Windows ecosystem. Migrating VMs from VMware Workstation to Hyper-V can help users reduce licensing costs, simplify management, and improve scalability.

Key advantages of Hyper-V include:

• Built-in Windows integration: Hyper-V is included in Windows Server and supported Windows editions, allowing seamless integration with Windows environments, Active Directory, PowerShell, and Microsoft management tools.

• Cost efficiency: Organizations can reduce virtualization costs because Hyper-V is included with Windows Server licenses without requiring separate hypervisor licensing.

• Enterprise scalability: Hyper-V supports advanced features such as Live Migration, Failover Clustering, Hyper-V Replica, and System Center Virtual Machine Manager (SCVMM) for large-scale VM management.

• High availability and disaster recovery: Features like VM replication, clustering, and integration with backup solutions help improve workload availability and data protection.

• Flexible management and automation: Administrators can manage Hyper-V environments through Hyper-V Manager, Windows Admin Center, and PowerShell automation.

• Broad backup and migration support: Hyper-V is supported by many backup and recovery solutions, making VM protection and cross-platform migration easier.

Before migration, note that VMware Workstation uses VMDK disks, while Hyper-V uses VHD/VHDX formats. Therefore, the VM disk and configuration need to be converted before running on Hyper-V.

VMware Workstation vs Hyper-V: Key Comparison

Method 1: Convert VMDK to VHDX Using qemu-img

qemu-img is a practical tool for users who’s familiar with command lines. As part of the QEMU project, qemu-img supports various virtual disk formats, including VMDK, VHD/ VHDX, qcow2, Raw, and VDI.

Unlike MVMC, this tool only converts virtual disk file and does not automatically create a Hyper-V VM. Therefore, you need to manually create a Hyper-V VM and attach the converted VHDX file after conversion.

Step 1: download and install qemu-img on a Windows machine. Make sure the tool can access the Vmware Workstation VM files, especially the .VMDK virtual disk.

Step 2: Convert VMDK to VHDX

Open Command Prompt and run the following commands:

Qemu.img convert -f vmdk -o vhdx source.vmdk destination.vhdx

Replace:

Source.vmdk with the path of the VMware virtual disk

Destination.vhdx with the target location for the converted Hyper-V disk

Step 3: After conversion, create a Hyper-V virtual machine:

1. Open Hyper-V Manager;

2. Create a new virtual machine;

3. Configure VM settings, including generation, CPU, memory, and network adapter.

4. Select Use an existing virtual hard disk and attach the converted VHDX file.

Step 4: start the Hyper-V VM and check whether the Operating system boots correctly.

Method 2: Migrate VMware Workstation to Hyper-V with Vinchin Backup & Recovery

Another efficient approach is to use an enterprise backup solution, such as Vinchin Backup & Recovery. Unlike manual conversion methods, it provides an image-based migration workflow that enables VM migration across different virtualization platforms, including VMware, Proxmox, Hyper-V, and XenServer.

Vinchin ensures reliable V2V migration with features such as immutable backup for data protection, instant recovery, and granular restore capabilities. It also supports bulk VM migration without manually converting virtual disks. With automated migration workflows and a centralized management console, administrators can simplify migration tasks, reduce downtime, and monitor the entire process more efficiently.

To convert a VMware VM to Hyper-V, follow:

1. Navigate to Backup > Virtualization to create a backup for the source VMware VM.

2. Then, go to Data Resilience > Restore and choose the VMware backup storage as the data recovery source.

3. Choose the target host and VM configurations to complete the restore destination.

4. Customize the restore strategies; set the restore time, throttling policy, and transmission, security, and advanced strategies.

5. Confirm all the options and click Submit. Later, you can monitor the current task in the Monitor Center > Jobs.

Vinchin Backup & Recovery provides an all-in-one data protection solution covering backup, restore, verification, and monitoring. It helps organizations automate protection workflows and reduce manual efforts. Start your 60-day fully featured free trial today and experience the features firsthand, and choose the plan that best fits your business needs.

Method 3: Convert VMware Workstation VM to Hyper-V Using MVMC

Microsoft Virtual Machine Converter (MVMC) is Microsoft’s legacy conversion tool that can convert VMware Workstation virtual disks (VMDK) to Hyper-V compatible VHD files.It provides a straightforward way to migrate individual VMs but may have limitations due to its discontinued development.

Step 1: Install and Launch MVMC

Download and install MVMC on a Windows machine. Open the conversion wizard and select the option to convert a virtual machine.

Step 2: Prepare the VMware Workstation VM

Before conversion:

• Shut down the VM completely

• Remove unnecessary snapshots

• Make sure the virtual disk file(.vmdk) is accessible

• Uninstall VMware tools if needed to avoid driver traffic after migration

Step 3: Select the VMware VM as the source

Choose VMware as the source platform and provide the location of the VMware VM or VMDK file. Configure the source VM information and authentication settings if required.

Step 4: Configure Hyper-V as the destination

Select Hyper-V as the target platform and specify Hyper-V host name, destination storage path, VM name, and network settings.

Step 5: Verify and start the migrated VM

After conversion:

1. Open the Hyper-V Manager;

2. Check the VM hardware settings, including memory, CPU, and network adapter.

3. Start the VM and verify that the operating system boots properly.

4. Install Hyper-V integration components or update drivers if necessary.

Migrate VMware Workstation to Hyper-V FAQs

Q1: Which is the best way to migrate VMware Workstation to Hyper-V?

It depends on your requirements. MVMC or qemu-img works well for individual VM migration, while backup-based solutions are more suitable for multiple VMs or enterprise environments.

Q2: Will my Windows license remain activated after migration?

Not always. Since Hyper-V uses different virtual hardware, Windows may detect a hardware change and require reactivation.

Q3: Can I directly import a VMware Workstation VM into Hyper-V?

No. VMware Workstation uses VMDK virtual disks, while Hyper-V uses VHD/VHDX. You need to convert the virtual disk or use a migration solution before running the VM on Hyper-V.

Conclusion

Migrating VMware Workstation to Hyper-V helps users achieve better Windows integration, scalability, and enterprise-level management. This guide introduced three migration methods: MVMC, qemu-img conversion, and Vinchin Backup & Recovery. Compared with other two methods, Vinchin makes V2V migration easier with automated workflows, centralized management, and batch migration capabilities, reducing complexity and downtime.

"My Windows Server 2016 Hyper-V VM is stuck in a saved state and won't start, showing the error 'failed to change state'. The issue appeared after I replaced the VM's virtual switch following a NIC change, and I'm unsure whether deleting the saved state is the right solution."

This error can be triggered by virtual switch changes, corrupted saved states, configuration issues, or storage and service problems. In this post, we’ll discuss the reasons behind this error, walk through the necessary checklist, and provide practical solutions to get your virtual machine running again.

Explanation of the Error

The "Hyper-V failed to change state" error indicates that Hyper-V cannot complete a requested state transition for a virtual machine. This may occur when starting, stopping, pausing, resuming, or saving a VM, preventing it from reaching the desired state.

Depending on the underlying cause, you may encounter one or more of the following symptoms:

• The virtual machine remains stuck in Starting, Stopping, or Saved status.

• The VM fails to power on or shut down.

• Hyper-V Manager displays the message "Failed to change state."

• VM operations such as checkpoints or live migration cannot be completed.

Since this is a generic error, identifying the root cause is essential before attempting any fixes.

Common Reasons for the Hyper-V Failed to Change State Error

Several factors can trigger this error. Below are the most common ones.

Insufficient System Resources

A lack of available CPU, memory, or disk space can prevent Hyper-V from changing the VM's state successfully.

Corrupted Saved State or Checkpoints

A damaged saved state or broken checkpoint chain may stop the VM from starting or resuming normally.

Virtual Disk Issues

If the VHD or VHDX file is missing, corrupted, locked by another process, or inaccessible due to permission issues, Hyper-V may fail to perform state transitions.

Virtual Switch Configuration Changes

Changing or deleting a virtual switch without properly updating the VM's network configuration can leave the virtual machine in an inconsistent state.

Hyper-V Services Failure

Critical services such as the Hyper-V Virtual Machine Management Service (VMMS) may have stopped unexpectedly, preventing normal VM operations.

Hardware or Storage Problems

Storage failures, disconnected drives, or unstable storage connections can interrupt access to virtual machine files and trigger the error.

Must-Have Checklist When this Error Occurred

Before trying any repair methods, perform the following checks to narrow down the cause.

1. Check Event Viewer

Review Windows Logs and Applications and Services Logs > Microsoft > Windows > Hyper-V for related error messages.

2. Verify VM Status

Run:

Get-VM

Check whether the VM is stuck in Saved, Paused, or another abnormal state.

3. Check Hyper-V Services

Run:

Get-Service vmms

Ensure the Hyper-V Virtual Machine Management Service is running.

4. Verify the Virtual Disk

Confirm that the VHD/VHDX file still exists, the file path is correct, and the disk is not locked by another application.

5. Check Virtual Switch Configuration

Verify that the VM is connected to a valid virtual switch, especially if the host's physical NIC or virtual networking configuration was recently modified.

6. Review System Resources

Ensure the Hyper-V host has sufficient CPU, memory, and available disk space to start the virtual machine. Once you've identified the likely cause, you can apply the appropriate solution in the next section.

Solutions to Resolve the Hyper-V Failed to Change State Error

Once you've identified the likely cause, apply the appropriate solution below.

1. Restart Hyper-V Services

If the error is caused by a temporary service failure, restarting the Hyper-V Virtual Machine Management Service (VMMS) may restore normal VM operations.

Run:

Restart-Service vmms

If necessary, restart the Hyper-V host after the service has been restarted.

2. Delete the Saved State

If the virtual machine is stuck in a saved state, deleting the saved state can often resolve the issue without affecting the virtual hard disk or guest operating system. After removing the saved state, try starting the VM again.

3. Repair the Virtual Switch Configuration

If the problem occurs after modifying or deleting a virtual switch, reconnect the virtual machine to a valid switch in Hyper-V Manager. Verify that the new virtual switch is correctly bound to the physical network adapter.

4. Verify the Virtual Disk

Ensure the VM's VHD or VHDX file is accessible and hasn't been moved, renamed, or corrupted. If the storage location has changed, update the virtual disk path before restarting the virtual machine.

5. Free Up Host Resources

Low memory, insufficient disk space, or excessive CPU usage may prevent Hyper-V from changing the VM state. Releasing host resources or shutting down unnecessary virtual machines may resolve the problem.

Restore the VM from Backup with Vinchin Backup & Recovery

If the VM configuration, checkpoint chain, or virtual disk has been severely corrupted and none of the above solutions work, restoring the virtual machine from a recent backup is often the fastest way to resume business operations.

Vinchin Backup & Recovery delivers reliable image-level protection for Hyper-V virtual machines and enables instant recovery whenever unexpected failures occur. Whether you need to restore an entire VM after severe corruption or roll back to a previous recovery point, the solution helps minimize downtime with rapid, point-in-time recovery while ensuring system consistency throughout the restoration process.

Here’s how to do it:

1. Before the recovery, create a backup task for the original Hyper-V VM.

2. Go to Data Resilience > Restore, and choose the Hyper-V backup storage you made as the data recovery source.

3. Choose the target host and configurations to specify the restore destination.

4. Customize the restore strategies, including schedule, throttling policy, transmission, and security strategies. Choose the options as you like.

5. Review all the settings and tab Submit to start the task. You can monitor the real-time process on the web console.

Vinchin Backup & Recovery focuses on enterprise disaster recovery and is constantly improving our services. You can download the 60-day fully-featured free trial to estimate whether it satisfies your VM protection requirements.

Hyper-V Failed to Change State FAQs

Q1: Why does Hyper-V say "Failed to change state"?

This is a generic error indicating that Hyper-V cannot complete a requested VM operation. The underlying cause may be related to saved states, virtual disks, Hyper-V services, virtual switches, or insufficient system resources.

Q2: Is it safe to delete a saved state?

Yes. Deleting a saved state only removes the VM's suspended state and does not delete the virtual hard disk or guest operating system. However, any unsaved session data stored in memory will be lost.

Q3: When should I restore the VM from backup?

If the VM configuration, virtual disk, or checkpoint chain has become irreparably damaged, restoring the VM from a verified backup is typically the quickest and safest recovery option.

Closing Thoughts

The "Hyper-V failed to change state" error can usually be resolved by checking VM configuration, Hyper-V services, storage, and networking. If the issue leads to severe VM corruption, restoring the virtual machine from a reliable backup is often the fastest recovery option. Vinchin Backup & Recovery helps protect Hyper-V workloads with dependable backup and rapid recovery, ensuring your business can recover quickly from unexpected failures.

Volume Shadow Copy Service (VSS) is a Windows framework introduced in Windows XP and Windows Server 2003 that coordinates the creation of consistent, point-in-time snapshots of data, even while applications continue writing to disk. Every enterprise-grade backup tool on Windows leans on VSS to guarantee crash-consistent or application-consistent copies without forcing a system-wide freeze.

When you see the error "Unable to create a VSS snapshot of the source volume," the backup job never really started. VSS sits between your backup software and the data, and something interrupted the handshake before a coherent snapshot could be committed.

VSS Snapshot Error Code Reference

These are the codes most commonly reported alongside the unable to create a VSS snapshot message, based on documented cases from Microsoft, VMware Broadcom, and major backup vendors:

Reasons for Unable to Create a VSS Snapshot of the Source Volume

1. Third-Party VSS Provider Conflicts

Installing multiple backup agents or migration tools can leave behind competing VSS providers. Windows can only commit a snapshot through one provider per volume at a time, so an orphaned provider from a previously uninstalled product silently blocks all future snapshots. Watch for 0x8004230F and 0x8004230E.

2. Concurrent Snapshot Requests (0x80042316)

Microsoft's VSS snapshot manager handles one snapshot set at a time. Two backup jobs overlapping, even briefly due to schedule drift, cause the second to fail immediately with VSS_E_SNAPSHOT_SET_IN_PROGRESS.

3. Insufficient Space on the System Reserved Partition

VSS stages shadow copy metadata on the System Reserved partition (typically 100–500 MB). When third-party software fills it unexpectedly, VSS returns 0x8004231F. The partition looks healthy in Disk Management because the problem isn't visible without assigning it a drive letter.

4. VSS Writer in a Failed or Waiting State

Per-application VSS writers (SQL Server, Exchange, NTDS, etc.) coordinate with VSS during snapshots. A single writer stuck in "Failed" or "Waiting for completion" blocks the entire snapshot set, typically triggered by a failed Windows Update or an abrupt shutdown.

5. Windows Server Backup Feature Not Installed (VMware Converter)

VMware vCenter Converter Standalone relies on the Windows Server Backup VSS writer during P2V conversions. On systems where that Windows feature has never been installed, VSS lacks the necessary writer and fails at the snapshot phase.

Run These Diagnostic Commands First

Before touching services or registry keys, spend two minutes gathering facts. Open an elevated Command Prompt and run:

• rem - Check VSS writer health

vssadmin list writers

• rem - Identify all registered providers

vssadmin list providers

• rem - See how many shadow copies already exist

vssadmin list shadows

• rem - Check shadow storage allocation per volume

vssadmin list shadowstorage

What to look for in vssadmin list writers: every writer should show State: [1] Stable with Last error: No error. Any writer showing Failed, Time out, or Waiting for completion is a direct suspect.

In vssadmin list provider, if you see more than a single Microsoft provider, you have a third-party provider that may be causing conflicts.

Step-by-Step Fixes by Error Type

According to the error code above, here are the fixes.

Fix 1. Restart VSS Services (All Errors - Try This First)

A stuck or unstable VSS service is the lowest-effort fix and resolves a surprising number of cases. In an elevated prompt:

net stop vss
net stop swprv
net start vss
net start swprv

If a service restart doesn’t hold, a full server reboot clears the snapshot manager state more reliably.

Fix 2. Remove the Conflicting Third-Party VSS Provider (0x8004230F/0x8004230E)

Uninstall the product that registered the extra provider. After uninstalling, verify the provider is gone:

Vssadmin list providers

If the orphaned provider key persists, move it from the Windows Registry at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VSS\Providers. Export the key first as a backup, then delete everything except the Microsoft provider key {b5946137-7b9f-4925-af80-51abd60b20d5}. Reboot afterward.

Fix 3. Resolve Snapshot Conflicts by Staggering Schedules (0x80042316)

Confirm no other VSS-aware process overlaps with your backup windows:

rem - Check existing shadow copies and their creation times

vssadmin list shadows /for=C:

Separate competing backup schedules by at least 30 minutes and ensure only one backup solution is actively installed. If you must run scheduled shadow copies alongside a backup agent, disable Windows’ built-in shadow copy schedule for the volume and let the backup agent manage snapshots exclusively.

Fix 4. Free Up the System Reserved Partition (0x8004231F)

Assign a temporary drive letter to the System Reserved partition (e.g., Z:) via Disk Management, then inspect its contents. If third-party software has placed files here, remove them. Also, delete stale shadow copies from the affected volume:

vssadmin delete shadows /for=C: /oldest

To increase the maximum shadow storage on a volume:

Vssadmin resize shadowstorage /for=C: /on=C: /maxsize=5%

Fix 5. Re-register VSS DLLs (Persistent Writer Failures)

When VSS writers fail even after service restarts, re-registering the VSS component DLLs often resolves underlying COM registration corruption:

cd /d %windir%\system32
net stop vss
net stop swprv
regsvr32 /s ole32.dll
regsvr32 /s oleaut32.dll
regsvr32 /s vss_ps.dll
Vssvc /Register
regsvr32 /s /i swprv.dll
regsvr32 /s /i eventcls.dll
regsvr32 /s es.dll
regsvr32 /s stdprov.dll
net start vss
net start swprv

Fix 6. Install Windows Server Backup Feature (VMware Converter P2V)

For VMware Converter failures specifically, install the Windows Server Backup feature on the source machine before re-running the conversion job:

rem - PowerShell (Windows Server)

Install-WindowsFeature Windows-Server-Backup

This installs the VSS writer that VMware Converter requires during the snapshot phase.

Why VSS Errors Are Less of a Problem with the Right Backup Solution

Every fix above is reactive, you are cleaning up after a VSS failure that already interrupted your backup window. The better long-term question is: what kind of backup solution allows you to avoid dealing directly with the complexities of the VSS mechanism?

Vinchin Backup & Recovery is an agentless backup platform designed for virtual environments, including VMware vSphere, Hyper-V, Proxmox VE, XenServer, KVM, RHV, and Oracle OLVM.

For VM-level backups, Vinchin works directly with the hypervisor’s own snapshot APIs, like vSphere Storage APIs for Data Protection (VADP) on VMware, rather than routing through the guest OS’s VSS stack for every job. The architectural difference means VSS writer conflicts, provider registration issues, and snapshot-set configuration inside the guest simply don’t reach your backup schedule.

Steps to back up VMware VMs:

Step 1. Go to Backup > Virtualization and choose the VMware VM.

Step 2. Select the target storage and target node.

Step 3. Configure the desired backup strategies.

Step 4. Review and confirm the above settings are correct, then click Submit.

Download Vinchin and start a free 60-day trial to see how it handles your environment’s VSS footprint. Or contact sales directly to describe your demands.

FAQs

Q1: Can I disable VSS entirely to stop these errors?

Technically, yes. You can set the Volume Shadow Copy service to Disabled. But doing so means you lose point-in-time backups, Previous Versions for end-users, and any application-consistent backup capability.

Q2: How many shadow copies can a Windows volume hold?

Windows enforces a hard limit of 64 shadow copies per volume.

Q3: Why does the VSS error only happen every few days, not every backup?

Intermittent VSS failures are almost always scheduling conflicts, a Windows-managed shadow copy, an endpoint security product's own snapshot, or a previous backup job that didn't clean up its snapshot set. The overlap isn't consistent because schedule drift accumulates over time.

Conclusion

The unable to create a VSS snapshot error is usually caused by VSS writer failures, provider conflicts, or storage issues. By following a structured troubleshooting process and using a reliable backup solution like Vinchin Backup & Recovery, you can reduce VSS-related failures and keep your backups running consistently.

A VMware snapshot backup is a backup method that uses VMware snapshot technology to capture a virtual machine’s (VM) state at a specific point in time. A snapshot records changes made to the VM after it is created, allowing backup software to access a consistent VM state during the backup process.

However, VMware snapshots are not backups themselves. In most VMware backup solutions, snapshots are only used temporarily during the backup process. The backup software creates a snapshot, reads VM data, transfers the data to an independent backup repository, and then removes the snapshot after the backup is completed.

By combining VMware snapshots with technologies like Changed Block Tracking (CBT), backup solutions can identify only changed data blocks and perform faster incremental backups while reducing storage and network usage.

VMware Snapshot vs Backup: What’s the Difference?

Many users confuse VMware snapshots with backups, but actually they serve different purposes. A VMware snapshot is mainly designed for short-term rollback, while a backup creates an independent copy of VM data for long-term protection.

Here you can see a comparison table:

In short, a VMware snapshot is not a backup. Snapshots are useful for temporary changes or testing, but production environments should rely on professional backup solutions to ensure disaster recovery.

How to Back Up VMware VMs Using Snapshots?

There are several ways to back up VMware VMs using snapshot technology. Users can choose different methods based on their environments, backup requirements, and management experience. Below we’ll elaborate on these methods and their steps in detail.

Method 1: Use VMware Native Snapshot

VMware provides a built-in snapshot feature that allows administrators to capture a VM’s current state and restore it when needed. However, native snapshots are mainly designed for temporary rollback scenarios, such as software testing or configuration changes, rather than for long-term backups.

To create a VMware snapshot:

1. Log in to vSphere Client and select the target VM.

2. Right-click the VM and choose Snapshots > Take Snapshot.

3. Enter a snapshot name and description for identification.

4. Choose whether to include the VM memory state.

5. Click Take Snapshot to create the snapshot.

When recovery is required:

1. Open the VM snapshot manager.

2. Select the snapshot you want to restore.

3. Click Go to to revert the VM to the previous state.

Although this method is simple, administrators should avoid keeping snapshots for extended periods because snapshot files can grow quickly and affect VM performance.

Method 2: Use Professional Backup Software: Vinchin Backup & Recovery

For production environments, using professional VMware backup software is a more reliable approach. Solutions such as Vinchin Backup & Recovery use VMware snapshot technology to create consistent VM backups while storing backup copies separately from the production environment.

Compared with native snapshots, Vinchin provides more comprehensive protection features, including:

• Automated scheduling: Automatically run backup jobs based on daily, weekly, or custom schedules.

• Incremental backup: Only back up changed data after the initial full backup, reducing backup time and storage consumption.

• Deduplication: Eliminate duplicate data to optimize backup storage usage.

• Offsite backup: Store backup copies in remote locations for disaster recovery.

• Instant recovery: Quickly restore VMs and minimize downtime after failures.

To back up a VMware VM, just need to follow:

1. Download and open the Vinchin Backup & Recovery software, go to Backup > Virtualization, and select the VMware host as the backup source.

2. Choose the target storage (local disks/NFS Shares/iSCSI) and the target node to complete the backup destinations.

3. Customize the backup strategies. Schedule the task combined with full/incremental/differential backups and set the throttling, data storage, and retention policies.

4. Review all the options you chose before, and click Submit to let the task run.

Vinchin Backup & Recovery is making progress to provide customers with the most reliable services. Before making a decision, you’re welcome to download the 60-day fully-featured free trial to experiment with the premium features.

Method 3: Use VMware Snapshot-Based Backup Scripts

For users with scripting experience, VMware snapshot-based backup scripts provide a flexible way to automate VM snapshot creation and backup workflows. This method is commonly used in small environments or custom backup scenarios where administrators want more control over snapshot management.

A typical workflow includes:

Step1. Creating a snapshot before backup

Step2. Exporting or copying VM data to a backup location

Step3. Removing the snapshot after the backup is completed.

For example, VMware PowerCLI can be used to automate snapshot creation:

# Connect to vCenter Server
Connect-VIServer -Server "vcenter.example.com"

# Get the target VM
$vm = Get-VM -Name "VM01"

# Create a snapshot before backup
$snapshot = New-Snapshot -VM $vm -Name "Backup-Snapshot" 
-Description "Temporary snapshot for backup"

# Run backup task here
# Example: Export VM files or call a backup script

# Remove the snapshot after backup
Remove-Snapshot -Snapshot $snapshot -Confirm:$false

# Disconnect from vCenter
Disconnect-VIServer -Confirm:$false

However, script-based backups require manual management and lack advanced features such as CBT-based incremental backup, deduplication, and instant recovery. Thus, consider clearly before adopting this method.

VMware Snapshot Backup Best Practices

To use VMware snapshots effectively, follow these best practices:

• Do not use snapshots as long-term backups. Snapshots are designed for short-term rollback and should be removed after they are no longer needed.

• Monitor snapshot size regularly. Large snapshot files can consume datastore space and impact VM performance.

• Avoid keeping multiple snapshots for extended periods. Long snapshot chains may increase recovery complexity and reduce performance.

• Store backups separately. Always keep backup copies on independent storage to protect against hardware failures or disasters.

• Use professional backup solutions for production environments. Features like CBT, incremental backup, and automated retention policies provide more reliable protection.

VMware Snapshot Backup FAQs

Q1: Can VMware snapshots be used as backups?
No. VMware snapshots only capture VM changes temporarily and should not replace regular backups.

Q2: How long can I keep a VMware snapshot?
Snapshots should generally be kept only for short periods. Long-term snapshots may cause storage and performance issues.

Q3: Do VMware backup solutions use snapshots?
Yes. Many VMware backup solutions use temporary snapshots to create consistent VM backups and remove them automatically after completion.

Final Words

VMware snapshots are useful for temporary rollback, but they are not a replacement for backups. For reliable VM protection, organizations should use professional VMware backup solutions that provide automated backup, incremental protection, and fast recovery.

Vinchin Backup & Recovery helps simplify VMware data protection with snapshot-based backup, CBT, deduplication, and instant recovery features. Try the 60-day free trial to explore enterprise-level VMware backup capabilities.

The good news is that most connection failures can be resolved without affecting virtual machines themselves. And here are the solutions.

Root Causes at a Glance

There is no single reason this error appears. Based on documented cases from Broadcom’s support knowledge base and community reports, the most common culprits are:

Fix Guide to vCenter Connection Error

This section outlines the solution steps based on the causes listed above, so you can identify the one that meets your specific needs.

Fix 1. Remove Duplicate SSO Service Registrations

When: The error appeared after a vCenter reinstall or upgrade, or after vCenter was rejoined to an SSO domain without first performing a clean unregistration.

Why it happens: During reinstallation, the old service endpoint stays registered in the Lookup Service. The vSphere Client finds two registrations for the same FQDN and cannot determine which is authoritative.

How to fix:

1. SSH into the vCenter Server Appliance. Enable SSH via https://<VCSA-IP>:5480 > Access > SSH Login if not already on.

2. Download and run lsdoctor in check mode (no changes yet):

python lsdoctor.py -l

Look for output containing Duplicates Found next to a vCente FQDN. If the duplicate is the PSC HA VIP, ignore it, that is expected.

3. If duplicates are confirmed, raise a support ticket via the Broadcom Support Portal before proceeding.

4. After the stale endpoint is removed, log out and back into the vSphere Client. The error should be gone.

Fix 2. Update the Lookup Service After SSL Certificate Replacement

When: The error appeared shortly after replacing the Machine SSL certificate on vCenter Server.

Why it happens: vCenter uses the new certificate, but the Lookup Service still retains the old certificate's Base64-encoded sslTrust.

How to fix:

1. Take an offline snapshot of all vCenter Servers in Enhanced Linked Mode before making any changes.

2. SSH into VCSA and export the new machine certificate:

/usr/lib/vmware-vmafd/bin/vecs-cli entry getcert \\
--store MACHINE\_SSL\_CERT \\
--alias \_\_MACHINE\_CERT \\
--output /certificates/new\_machine.crt

3. Retrieve the fingerprint of the old certificate (from the Lookup Service registration):

python /usr/lib/vmware-lookupsvc/tools/lstool.py list \\
--url https://localhost/lookupservice/sdk \\
--no-check-cert \\
--ep-type com.vmware.cis.cs.identity.sso 2>/dev/null

Copy the SSL trust Base64 string, save it as old\\\_machine.crt, then get its fingerprint:

 openssl x509 -fingerprint -sha1 -noout -in /certificates/old\\\_machine.crt

4. Run Is\\\_update\\\_certs.py to sync the Lookup Service:

python /usr/lib/vmware-lookupsvc/tools/ls\\\_update\\\_certs.py \\\\
--url https://localhost/lookupservice/sdk \\\\
--fingerprint <old\\\_cert\\\_SHA1\\\_fingerprint> \\\\
--certfile /certificates/new\\\_machine.crt \\\\
--user administrator@vsphere.local \\\\
--password '<Password>' 2>/dev/null

5. Log out and back into vSphere Client to confirm the error is gone.

Fix 3. Resolve VPXD Session Exhaustion

When: The error appeared after a backup client, monitoring agent, or any external integration started using stale or wrong credentials for vCenter.

Why it happens: Every failed login attempt consumes an HTTP session slot in the VPCD service. When the pool is exhausted, legitimate logins, including your own, get a connection error.

How to fix it:

1. Review the vCenter logs for the offending account:

 journalctl -u vmware-vpxd | grep "BadUsernameSessionEvent"

This shows the account name and source IP making failed attempts.

2. In the vSphere UI, go to Menu > Administration > Sessions.

Apply filters to identify accounts with unusually high session counts. Terminate excess sessions as needed.

3. Fix the root credential issue, reset the password in the third-party tools too (backup software, monitoring agent), and update it in the external service’s vCenter connection settings.

4. If the system is critically impacted and you need to restore access immediately, increase maxSessionCount as a temporary workaround:

• Take a VCSA file-based backup first.

• Stop vCenter services.

• Edit /etc/vmware-vpx/vpxd.cfg and increase the maxSessionCount value.

• Restart vCenter services.

• Apply the permanent credential fix in parallel.

Fix 4. Remove an Orphaned Linked-Mode vCenter

When: A remote site running a linked vCenter Server was lost (disaster, hardware failure, or decommissioned) and is never coming back.

Why it happens: The main vCenter still holds a registration for the now-unreachable remote vCenter in its SSO domain. On every login, it tries and fails to contact it.

How to fix it:

1. Confirm the remote vCenter is truly unrecoverable. If there is any chance of restoration, stop here and restore it instead.

2. Enable SSH on the main VCSA via https://<VCSA-IP>:5480 > Access > SSH Login.

3. SSH into the main VCSA and use cmso-util to unregister the dead vCenter:

/usr/lib/vmware-vmafd/bin/cmsso-util unregister \\\\
--node-pnid <dead-vCenter-FQDN> \\\\
--username administrator@vsphere.local \\\\
--passwd '<Password>'

4. Log out and back in. The connection error banner should no longer appear.

Fix 5. Correct Clock Skew

When: The error appeared after vCenter was paused (snapshot, maintenance window), or after ESXi host maintenance with NTP misconfigured.

Why it happens: SAML tokens from the Security Token Services (STS) have a tight time tolerance, by default, a clock difference of more than 5 minutes between vCenter and the connecting client causes token validation to fail, which surfaces as a generic connection error.

How to fix:

1. On the VCSA, verify the current time and NTP status:

timedatectl status
chronyc tracking

2. If NTP is not synchronized, configure it via the VCSA Management Interface (https://<VCSA-IP>:5480 > Time > NTP Servers) or via CLI:

/usr/lib/vmware/common-jars/ntpdate ntp.server.address

3. Verify ESXi hosts also have a consistent NTP configuration.

Mismatched VMware Tools time sync settings on a host are a common culprit after maintenance.

4. Restart the vpxd service after the time is corrected:

service-control --restart vmware-vpxd

Fix 6. Resolve Port or DNS Issues

When: curl -k https://<vCenter-FQDN>:443/sdk times out or returns connection refused, or a manual port change was made previously.

How to fix it:

1. Test basic connectivity:

ping <vCenter-FQDN>          # DNS resolution check
telnet <vCenter-FQDN> 443    # Port reachability check

• Ping fails → DNS or routing problem. Fix name resolution first (check `/etc/hosts` or your DNS server).

• Telnet fails → Firewall or port mismatch. Check Windows Firewall, cloud security groups, or on-prem firewall rules for TCP 443.

2. If vCenter is behind a load balancer, bypass it temporarily by connecting directly to vCenter’s IP or FQDN. If the error goes away, the load balancer is failing to proxy /sdk correctly, review the LB routing rules.

3. If a port was manually changed from 443 to a non-standard port, re-register the vCenter services with the correct port using the Lookup Service CLI tools, or reinstall vCenter with the correct port from the start.

Protect Your VMware VMs with Vinchin Backup & Recovery

When managing enterprise VMware infrastructures, backup reliability depends on stable communication with vCenter Server. Vinchin Backup & Recovery is designed to integrate with VMware environments through official VMware APIs while providing features that help simplify virtual machine protection.

• Agentless + direct ESXi backup: Vinchin connects to vCenter when it’s available, but can fall back to direct ESXi host-level backup during vCenter outages, keeping VM protection continuous even when the management plane is down.

• VCSA backup: Vinchin can protect the vCenter Server Appliance (VCSA) as a virtual machine. In the event of corruption, hardware failure, or site loss, the appliance can be restored from a recent backup to speed up recovery and reduce downtime.

• Instant restore: Get VMs back online in minutes while underlying issues are being resolved, without waiting for a full data restore.

• Connection failure alerting: When vCenter connectivity is disrupted, Vinchin surfaces the event in its dashboard and can send alerts, so administrators know immediately rather than discovering backup failures after the fact.

A complete backup strategy protects not just your VM data, but the management infrastructure itself, because recovering from a vCenter connection failure is a lot easier when you have a clean VCSA backup to fall back on. Click the following to try Vinchin free trial for 60 days!

FAQs

Q1: Does this error mean my VMs are down?

No, ESXi hosts and their VMs continue running independently of vCenter. The error affects management visibility and vCenter-dependent automation.

Q2: My backup tool stopped working right when this error appeared. Are they related?

Almost certainly. If your backup software uses the vCenter API for agentless backup, it will fail to connect to vCenter for the same reason you see the banner.

Conclusion

Most vCenter connection errors can be resolved by addressing the underlying configuration or connectivity issue. With the right troubleshooting steps and a reliable backup solution like Vinchin Backup & Recovery, you can quickly restore management access and keep your VMware environment protected.

"After working normally for months, my vCenter Server Appliance 6.7 suddenly started showing the error 'A vCenter Single Sign-On service error occurred' when browsing LDAP users. Although LDAP users can still log in successfully, I can no longer view domain users or assign permissions to them through vCenter."

This issue is commonly encountered in environments using LDAP or Active Directory authentication and can disrupt user management even when login authentication remains functional. In this article, we'll explore the possible root causes of the error, walk through the troubleshooting process, and provide proven solutions to restore normal SSO functionality.

What Does "A vCenter Single Sign-On Service Error" Mean?

The "A vCenter Single Sign-On service error occurred" message indicates that vCenter cannot communicate properly with its Single Sign-On (SSO) service. Because SSO handles user authentication and identity management, any failure may interrupt login, user lookup, or permission assignment.

Common symptoms include:

• Unable to browse Active Directory or LDAP users

• Failed to assign permissions to domain accounts

• Login failures to the vSphere Client

• Authentication errors after a reboot or upgrade

• VMware services failing to start

Common Causes of the vCenter Single Sign-On Service Error

Several factors can trigger this error. The most common ones include:

Expired STS Signing Certificate

An expired Security Token Service (STS) certificate prevents SSO from issuing authentication tokens, resulting in login or authentication failures.

vCenter Services Failed to Start

Essential services such as vmware-stsd, vmware-vpxd, or vmware-vmdir may stop running because of system crashes, failed upgrades, or configuration issues.

Directory Service Issues

Problems communicating with Active Directory or LDAP can prevent vCenter from retrieving users and groups or validating identities.

DNS or Time Synchronization Problems

Incorrect DNS records or unsynchronized system clocks may cause authentication requests to fail.

Corrupted SSO Configuration

A failed upgrade, patch, or manual configuration change can damage SSO components and prevent them from working correctly.

Resource Exhaustion

Low CPU, memory, or disk space may prevent VMware services from starting normally, leading to SSO errors.

How to Diagnose the Error

Before applying any fixes, perform the following checks to identify the root cause.

1. Check the VAMI Interface

Open:

https://<vcenter>:5480

Review the appliance health, storage usage, and service status.

2. Verify VMware Services

Run:

service-control --status --all

Confirm that critical services, including vmware-stsd, vmware-vmdir, and vmware-vpxd, are running normally.

3. Review vCenter Logs

Check the log files under: /var/log/vmware/

Pay close attention to SSO, STS, and directory-related errors that may reveal the root cause.

4. Validate the STS Certificate

Verify that the Security Token Service (STS) certificate is still valid and has not expired.

5. Verify DNS and Time Synchronization

Ensure forward and reverse DNS resolution works correctly and that vCenter and the identity source are synchronized through NTP.

6. Check System Resources

Run:

df -h

Verify that the appliance has sufficient disk space, memory, and CPU resources to keep VMware services running properly.

Once you've identified the underlying issue, you can proceed with the appropriate solution described below.

How to Fix the vCenter Single Sign-On Service Error

Once you've identified the root cause, apply the corresponding solution below.

Restart VMware Services

If the issue is caused by a temporary service failure, restarting the affected services is often the quickest fix.

service-control --stop --all
service-control --start --all

After all services have restarted, log in to the vSphere Client and verify whether the error has been resolved.

Renew an Expired STS Certificate

If the STS signing certificate has expired, renew it using VMware's certificate management tools or follow the official certificate replacement procedure. Once the new certificate is installed, restart the related services to restore normal authentication.

Repair Directory Service Connectivity

Verify that the configured Active Directory or LDAP server is reachable and that the bind account credentials remain valid. If necessary, reconfigure the identity source in vCenter and confirm that users and groups can be queried successfully.

Correct DNS and Time Settings

Ensure that:

• Forward and reverse DNS records are configured correctly.

• vCenter and domain controllers use the same NTP source.

• Hostnames resolve consistently across the environment.

Many SSO authentication problems disappear once DNS and time synchronization issues are corrected.

Repair the SSO Configuration

If the problem occurs after a failed upgrade or configuration change, repairing or reconfiguring the SSO service may restore normal operation. For severe configuration corruption, reinstalling the affected SSO components may be necessary.

Restore VMware vCenter from Backup With Vinchin Backup & Recovery

If none of the above methods resolve the issue, or the SSO configuration has become severely corrupted after a failed upgrade or unexpected system failure, restoring vCenter from a known-good backup is often the fastest way to bring authentication services back online. 

Vinchin Backup & Recovery simplifies this process by providing reliable image-level protection for VMware environments. It enables administrators to restore the entire vCenter Server Appliance with its configuration, certificates, and authentication settings intact, while incremental backups keep recovery points up to date with the latest system changes. If necessary, you can also perform point-in-time recovery to quickly roll back to a healthy vCenter state, minimizing downtime and reducing the operational impact of SSO-related failures.

Here’s how to Restore vCenter from Backup:

1. First, create a backup to store the entire vCenter appliance, including data, configuration, operating systems, etc.

2. Then, navigate to Data Resilience > Restore and find the vCenter backup storage you created as the restore point; you can expand the list to select specific source.

3. On the Restore Destination page, select the same one VMware host as the target restore platform and complete related configurations.

4. Customize the restore strategies, choose to restore now or schedule it combined with time windows. Remember to configure the rest settings as well.

5. Check all the options, and click Submit to let the restore task run.

Vinchin Backup & Recovery has a built-in monitoring console, where you can simultaneously manage and track all the backup and recovery jobs to prevent outages and ensure business continuity. You can download the 60-day free trial version to explore all the features before making a purchase.

Best Practices to Prevent Future SSO Errors

Although most SSO issues can be resolved, proactive maintenance is the best way to avoid unexpected outages.

• Monitor STS certificate expiration and renew certificates before they expire.

• Keep DNS and NTP configurations consistent across the VMware environment.

• Regularly update vCenter Server with the latest supported patches.

• Monitor CPU, memory, and disk usage to prevent resource-related service failures.

• Back up the vCenter Server Appliance regularly and verify that recovery points are available.

• Test your disaster recovery plan periodically to ensure backups can be restored successfully.

A vCenter Single Sign-on Service Error FAQs

Q1: What causes a vCenter Single Sign-On service error?

The error is commonly caused by an expired STS certificate, failed VMware services, directory service connectivity issues, DNS or NTP misconfiguration, corrupted SSO settings, or insufficient system resources.

Q2: Can I restart the SSO service without rebooting vCenter?

Yes. In many cases, restarting the affected VMware services using the service-control command is sufficient and does not require rebooting the appliance.

Q3: Why can LDAP or Active Directory users still log in but cannot be viewed?

This usually indicates that user authentication is still functioning, while the directory query or SSO service responsible for retrieving users and groups is experiencing problems.

Q4: Will restoring vCenter from backup fix the error?

If the issue is caused by configuration corruption or a failed upgrade, restoring vCenter from a healthy backup can quickly return the environment to a working state.

Conclusion

The "A vCenter Single Sign-On service error" can stem from several issues mentioned above. By following a structured troubleshooting process, administrators can identify the root cause and restore authentication services efficiently.

Since some failures may require rolling back to a healthy system state, maintaining regular backups of your vCenter Server is equally important. A reliable solution like Vinchin Backup & Recovery helps protect your VMware environment and enables fast recovery from configuration corruption, failed upgrades, or other unexpected incidents. 

Organizations migrate VMs between vCenters when VMware environments change, but workloads must stay available. Common reasons for cross vCenter migration include:

• Move VMs to new hosts, storage, and networks during a data center move or hardware renewal.

• Transfer VMs for host upgrades, storage replacement, cluster redesign, or architecture optimization.

• Centralize VMs from multiple vCenters after mergers, expansion, or infrastructure growth to simplify management.

• Move VMs to isolate production and test workloads, separate business units, or meet security requirements.

If you are planning a cross vCenter migration for similar scenarios, the following guide will walk you through the key preparation steps and migration methods to help ensure a smooth and reliable VM transfer.

Preparation before Cross vCenter Migration

Before cross vCenter migration, verify both source and target environments to reduce failed tasks, downtime, and post-migration issues:

• Check vCenter, ESXi, VM hardware, and VMware Tools compatibility.

• Confirm management, vMotion, VM, and storage network connectivity. 

• Ensure target hosts and datastores have enough CPU, memory, and storage. 

• Verify permissions, folders, clusters, port groups, and datastore mappings.

• Create a recent backup or rollback point.

• Record IP, DNS, VLAN, firewall, and application dependencies.

3 Methods to Migrate VMs Between vCenters

There are three ways to migrate VMs between vCenters, and the best choice depends on your VMware version, network conditions, downtime tolerance, VM size, and migration scale. Use the comparison below to choose a suitable option quickly.

Method 1: Cross vCenter vMotion

Cross vCenter vMotion allows you to migrate a running VM from one vCenter Server to another with little or no service interruption, as long as the required compatibility, network, and licensing conditions are met.

Step 1: Open VMware vSphere client, right click the virtual machine you want to migrate and then, select Change computer resource only.

Step 2: Select the server you want to migrate the virtual machine to and click Next.

Step 3: Select network if you have created a vSphere distributed switch and port group. If not, just click Next to skip this step.

Step 4: Review your migration job and click Finish. Virtual machine would be migrated in a while.

Best for: Production VMs that require hot migration and minimal downtime.

Pros: Minimal service interruption; no need to export and re-import VM files; suitable for live workloads.

Cons: Requires strict cross vCenter vMotion requirements, including compatible versions, available vMotion network, proper permissions, and sufficient bandwidth.

Method 2: Export and Import VMs Using OVF or OVA

OVF or OVA export is a simple way to move VMs from one vCenter to another when live migration is not required. It is often used for small workloads, test environments, or one-time migrations.

Step 1: Shut down the source VM to keep the exported VM data consistent.

Step 2: In the source vCenter, select the VM and export it as an OVF or OVA template.

Step 3: Download the exported files to a local machine or accessible storage location.

Step 4: Log in to the target vCenter and choose Deploy OVF Template.

Step 5: Upload the OVF or OVA file, then select the target host, datastore, disk format, and network mapping.

Step 6: Finish the deployment, power on the VM.

Best for: Small-scale VM migration, lab environments, or cases where downtime is acceptable.

Pros: Easy to use; does not require vMotion network configuration; suitable for isolated environments.

Cons: Requires VM downtime; large VMs may take a long time to export and import; manual network and application checks are still needed.

Method 3: Use Vinchin Backup & Recovery to Migrate VMs

In addition to VMware native migration methods, organizations can also use third-party VM migration software for more flexible migration scenarios, such as cross-network transfers, batch VM migrations, or moves between different infrastructures.

Vinchin Backup & Recovery provides this capability by migrating VMs between vCenters through backup and restore. It is especially useful when vMotion is unavailable, the source and target environments are isolated, or multiple VMs need to be transferred efficiently.

Step1: Click Resources > Infrastructure > Virtual Platform, then add both source and target VMware vSphere.

Step2: Go to Backup > Virtualization, select the source VMs, and create a backup task.

Step3: Once the backup task completes, go to Data Resilience > Restore and choose the restore point you created just now.

Step4: Select the target host that you want to migrate the VMs to.

Step5: Configure the restore strategy and confirm the task.

Best for: Batch migration, remote site migration, disaster recovery, or environments without available vMotion networks.

Pros: Does not depend on vMotion; supports migration from restore points; useful for large-scale or complex environments.

Cons: Requires backup storage and restore time; the final downtime depends on VM size, network speed, and recovery strategy.

Download Vinchin Backup & Recovery right now and unlock a full-featured 30-day free trial! Get complete access to all core virtual machine protection and migration capabilities, allowing you to seamlessly move, replicate, and transfer VMs across diverse virtual platforms during your trial period.

Common Issues & Troubleshooting

Even with careful planning, cross vCenter migration can fail because of network, compatibility, or application configuration issues. The following problems are common before or after migrating VMs between vCenters.

If you are facing migration failures or unexpected errors, the solutions below may help you troubleshoot and resolve the issues efficiently.

Issue 1: Cross vCenter vMotion Failed Due to Network Connectivity

Cause: 

The vMotion network is unreachable, firewall rules block required traffic, or the available bandwidth is not enough for live migration.

Solution: 

Check the VMkernel adapter configuration and make sure vMotion is enabled on the correct network. Verify routing, DNS, firewall rules, and network latency between source and target hosts. If the vMotion network cannot be used, consider another method that does not depend on vMotion, such as OVF/OVA export or backup-based migration.

Issue 2: VM Migration Failed Due to Compatibility Issues

Cause: 

The source and target environments may use different ESXi versions, incompatible CPUs, unsupported VM hardware versions, or mismatched VMware Tools status.

Solution: 

Check the VMware compatibility matrix before migration. Make sure the target ESXi host supports the VM hardware version, and adjust the VM configuration if needed. For CPU compatibility issues, review EVC settings or choose a compatible target host.

Issue 3: VM Boots Successfully but Application Does Not Work

Cause: 

The VM may power on normally, but applications can fail because of changed IP addresses, missing network mappings, DNS issues, firewall rules, or dependencies on the old environment.

Solution: 

Plan network settings before migration, including IP address, subnet, gateway, DNS, VLAN, and port group mapping. After migration, verify OS login, network connectivity, service status, application access, and communication with dependent systems.

Issue 4: Migration Takes Too Long

Cause: 

Large virtual disks, limited bandwidth, slow storage, snapshots, or one-by-one migration tasks can extend the migration window.

Solution: 

Remove unnecessary snapshots before migration, schedule tasks during off-peak hours, and prioritize critical VMs. For large-scale migrations, use incremental transfer, batch migration, or a tool such as Vinchin Backup & Recovery to reduce manual work and improve migration efficiency.

FAQs About Migrating VMs Between vCenters

Q1: Do source and target vCenters need to be in the same SSO domain?

A1: Not always. Some cross vCenter migration methods support different SSO domains, but requirements vary by vSphere version and migration method, so compatibility should be checked first.

Q2: Will the VM IP address change after migration?

A2: The IP address does not have to change, but it may need adjustment if the target site uses different VLANs, subnets, DNS, gateways, or firewall rules.

Q3: What should I check after the VM is migrated?

A3: Verify VM power status, VMware Tools, IP settings, DNS, application services, firewall rules, monitoring alerts, and user access before removing the original VM.

Final Thoughts

The best way to migrate VMs between vCenters depends on VM quantity, network conditions, and downtime tolerance. For a few VMs, cross vCenter vMotion is suitable when vMotion, compatibility, and licensing requirements are met. If vMotion is unavailable, OVF or OVA export and import can be used instead.

For large-scale migration or complex network environments, Vinchin Backup & Recovery offers a more flexible option with batch migration and no dependency on vMotion networks.

"I had several VMs running in Proxmox VE and scheduled regular backups for protection. At first, everything worked well. But a few weeks later, the Proxmox Backup Server storage was full, and new backup jobs began to fail. I found many old backups from different VMs, but I was unsure which were safe to delete. Deleting backups in PBS also did not free space immediately. Any safe suggestions for cleanup?"

This kind of situation is common when backup files keep growing without proper cleanup rules. Too many backup images can consume storage space and make management difficult. Learning how to safely delete old Proxmox backups and optimize storage usage is critical.

How to Delete Old Proxmox Backups Safely?

This section covers two common scenarios for deleting old Proxmox backups: deleting backups directly in Proxmox VE or deleting backups stored in Proxmox Backup Server (PBS). 

It also explains why storage space may not be released immediately after deleting backups in PBS.

Method 1: Delete Backups Directly in Proxmox VE

If your backup is stored on Proxmox VE storage, such as local storage, NFS, or CIFS, you can delete it directly from the Proxmox VE web interface via the steps below: 

Step1: Log in to the Proxmox VE web interface and select the target storage. 

Step2: Open the Backup content list and locate the old backup file. 

Step3: Verify the VM ID and backup timestamp. 

Step4: Select the backup file, click Delete or Remove, and confirm the operation.

Tip: For safety, always keep at least one valid restore point before deleting older backups. This gives you a fallback if the VM fails, data is lost, or you need to roll back after an update.

Method 2: Delete Backups in Proxmox Backup Server

PBS stores VM and CT backups as snapshots inside datastores, so the correct way to delete backups is through the PBS web interface. 

Step1: Open the target datastore.

Step2: Go to the backup content list.

Step3: Select a single snapshot or an entire backup group.

Step4: Remove the backups you no longer need.

Tip: Proxmox Backup Server delete backups will not release space immediately, as it uses deduplication. To reclaim storage space, you need to:

Step1: Click the Prune & GC button at the top.

Step2: Find the Start Garbage Collection button and click it.

Tip: For a long-term fix, it is recommended to set a Proxmox backup retention policy instead of cleaning old backups manually each time. In PBS, create or edit a prune job for the datastore, then define rules such as how many recent, hourly, daily, weekly, or monthly backups to keep. 

It also ensures that Proxmox auto deletes old backups and helps prevent the Proxmox Backup Server storage full issue from happening again.

Step1: Open Proxmox VE, click Datacenter > Backup > Add  

Step2: Select General option, choose the target VM and then choose Schedule.

Step3: In Retention, configure backup retention and click Create button.

Manage Multi-platform VM Backups with Vinchin

If your environment only includes Proxmox workloads, Proxmox Backup Server (PBS) is sufficient for managing backups with its built-in prune jobs and retention settings. However, if you have different virtualization platforms, managing backups separately can become time-consuming.

Vinchin Backup & Recovery supports multiple virtualization platforms, including VMware, Hyper-V, Proxmox, and so on. It allows to centrally back up VMs across different virtualization platforms, manage backups from a single interface, and apply unified retention policies.

Step1: Click Resources > Infrastructure > Virtual Platform to add your VMs to Vinchin Backup & Recovery

Step2: Create backup tasks and configure the backup schedule and retention policy.

Step3: Review and confirm backup configuration.

Spending too much time managing backups across different virtualization platforms? Download the 60-day free trial of Vinchin Backup & Recovery to simplify your VM backup management now.

FAQs About Deleting Proxmox Backups

Q1: Can I delete backups while a backup job is running?

A1: No. Wait until the current backup job finishes before deleting old backups. Removing files during an active backup process can cause confusion, failed jobs, or incomplete backup sets.

Q2: Can I recover a Proxmox backup after deleting it?

A2: Usually, no. Once a backup is deleted and the related storage space is reclaimed, Proxmox does not provide a built-in undo option. If the backup is important, move it to another storage location before deleting it from the original datastore.

Q3: Can I move Proxmox backups instead of deleting them?

A3: Yes. If you want to keep older restore points without using primary backup storage, you can move or copy them to another storage location. This is useful for long-term archive backups or compliance needs.

Q4: What should I do if backup deletion fails?

A4: Check whether the backup is protected, locked, currently in use, or stored in a location with permission or connectivity problems. After fixing the issue, refresh the storage view and try the deletion again.

Sum Up

Deleting old Proxmox backups is a necessary part of backup storage management. For long-term management, a proper Proxmox backup retention policy is usually safer than deleting backups manually each time. It helps keep enough restore points while preventing backup storage from filling up. 

If you manage backups across multiple virtualization platforms, a centralized backup solution can also help simplify backup scheduling, retention, and cleanup.

Yes, but not the same way you migrate a VM within a resource pool.

XenServer supports live migration only between hosts that belong to the same pool and share compatible storage and networking resources. When you need to migrate a VM to another XenServer pool, the destination pool is treated as an independent environment. This means VM metadata, storage mapping, and network configurations must be recreated or transferred during the migration process.

The good news is that there are multiple ways to accomplish this task. Some methods are built into XenCenter, while others rely on shared storage or backup software to simplify the migration.

The best option depends on several factors, including:

• VM size and disk capacity

• Whether both pools use shared storage

• Acceptable downtime

• Available network bandwidth

• Disaster recovery requirements

The following comparison will help you decide which method best suits your environment.

Comparison of XenServer Cross-Pool Migration Methods

Method 1: Export and Import the VM

Exporting a VM as an XVA file and importing it into another pool is the simplest way to perform XenServer migration between pools. Although the VM must be powered off during the process, this method works in almost any XenServer environment without requiring shared storage.

Step 1. Shut down the VM

Shut down the VM from the guest OS or XenCenter to ensure all data is written to disk before migration.

Step 2. Export the VM

In XenCenter:

1. Connect to the source pool.

2. Right-click the target VM and select Export.

3. Choose XVA as the export format.

4. Specify a local or network location to save the file.

5. Click Finish and wait for the export to complete.

Step 3. Copy the XVA File

Copy the exported XVA file to a location accessible by the destination XenServer pool.

Step 4. Import the VM

In XenCenter, connected to the destination pool:

1. Click Import.

2. Select the exported XVA file.

3. Choose the target host and storage repository.

4. Configure CPU, memory, and network settings.

5. Review the settings and start the import.

Step 5. Verify the migration

After the import is complete, power on the VM and verify that it operates normally.

Method 2: Migrate XenServer Between Pools Using Shared Storage

If both XenServer pools can access the same shared Storage Repository (SR), you can migrate the VM without copying its virtual disks. This method reduces migration time and is suitable for environments using shared SAN or NAS storage.

Step 1. Connect the Shared Storage

Attach the same SR to both the source and destination pools, and verify that it is accessible from all hosts.

Step 2. Shut Down the VM

Power off the VM to ensure data consistency before migration.

Step 3. Register the VM

In the destination pool, register the VM using the existing virtual disks stored on the shared SR.

Step 4. Configure the VM

Assign the VM to the correct storage, virtual network, and host if required.

Step 5. Verify the Migration

Start the VM and confirm that the operating system, storage, network, and applications are working properly.

Method 3: Restore XenServer VM to Another Pool from Backup

Unlike the export/import method, backup-based migration allows you to restore the VM directly to a new pool without manually copying virtual disks. It also provides an additional layer of data protection, ensuring that you can roll back if anything goes wrong during the migration.

Vinchin Backup & Recovery supports agentless backup and flexible recovery for XenServer environments. It enables administrators to restore VMs directly to a different pool with just a few clicks while maintaining data consistency. The solution simplifies XenServer cross-pool migration, minimizes downtime, and ensures business continuity during infrastructure upgrades, hardware replacement, or disaster recovery.

Step 1. First, create a backup of the VM from the source XenServer pool, then follow the restore steps.

Step 2. Next, go to the VM Backup > Restore page and select the backup storage you created before as the restore point.

Step 3. Choose the XenServer host with another pool as the target restore destination, and complete relevant VM settings.

Step 4. Customize the restore strategies. Restore the backup right now or schedule it daily, weekly, or monthly, combined with time windows.

Step 5. Review all the options and click Submit to initiate the task.

Vinchin Backup & Recovery is compatible with dozens of virtualization platforms, helping organizations protect critical workloads with reliable backup and disaster recovery. Download the 60-day free trial to experience all premium features before making a purchase.

Method 4: Replicate the VM to Another Pool

VM replication continuously synchronizes a VM to another XenServer pool, allowing you to perform a planned failover with minimal downtime. It is commonly used for disaster recovery and business continuity.

Step 1. Prepare the Destination Pool

Ensure the destination pool has sufficient CPU, memory, storage, and network resources.

Step 2. Create a Replication Task

Select the source VM, specify the destination pool and storage, then configure the replication schedule.

Step 3. Run the Initial Synchronization

Start the first replication to copy the entire VM to the destination pool.

Step 4. Synchronize Incremental Changes

Allow the replication job to continuously synchronize changed data blocks until the migration is ready.

Step 5. Perform the Failover

Stop the source VM, run a final synchronization, and power on the replicated VM in the destination pool.

Step 6. Verify the Migration

Confirm that the operating system, applications, storage, and network services are running normally.

Recommended Practices to Migrate XenServer VMs Between Pools

Regardless of which migration method you choose, following a few best practices can significantly reduce the risk of migration failures.

• Always create a recent backup before making any infrastructure changes.

• Verify that the destination XenServer version is compatible with the source environment.

• Ensure the target pool has sufficient CPU, memory, and storage resources.

• Check that storage repositories are healthy and accessible.

• Validate virtual network mappings before powering on the migrated VM.

• Schedule migrations during maintenance windows whenever possible.

• Test critical applications after migration instead of only confirming the VM boots successfully.

• Monitor CPU, memory, storage, and network performance during the first few hours after migration.

• Update monitoring, backup, and disaster recovery policies after the VM has been successfully migrated.

XenServer Migrate VM Between Pools FAQs

Q1: Can XenServer perform live migration between different pools?

No. Native live migration is designed for hosts within the same resource pool. To migrate a VM across pools, you'll need to use export/import, shared storage, backup restoration, or replication.

Q2: Does exporting a VM preserve snapshots?

In most cases, exporting a VM as an XVA file does not preserve the complete snapshot chain. If snapshot preservation is important, using a backup solution is generally a better choice.

Q3: Can I migrate a running VM to another pool?

Native cross-pool live migration isn't supported. Most migration methods require shutting down the VM before transferring it. Replication-based solutions can significantly reduce downtime by synchronizing data in advance.

Conclusion

The best way to migrate a VM between XenServer pools depends on your infrastructure, downtime requirements, and recovery objectives. Whether you choose export/import, shared storage, backup and restoration, or replication, careful planning and validation will help ensure a secure and successful XenServer cross-pool migration.

"I once ran into a strange VMware VM migrate greyed out issue: we had four ESXi hosts with the same hardware model, BIOS, iDRAC firmware, and VMware version, but several VM guests still could not be migrated. When I right-clicked the VM in vCenter, the VM migrate option was greyed out. The hosts looked normal, the VMs were running, and I had already checked a few obvious settings, but the issue still remained. Can you give me some suggestions?"

This is a common problem that VMware VM administrators may encounter when trying to migrate virtual machines. The migrate option can become unavailable for various reasons. We will list 6 most common causes of VM migrate greyed out issue and show you how to solve them.

6 Common Causes of VMware VM Migrate Greyed Out and Fixes

When you encounter the VMware VM migrate greyed out issue, the problem may be related to the 6 most common causes below. 

You can first check the table below to quickly identify the possible cause in your environment. After finding the most likely cause, follow the corresponding solution and then read the detailed explanation below if needed.

1. Lack Migration Permissions

Problem:

The issue may appear when you log in directly to a single ESXi host instead of managing the VM through vCenter Server. In some cases, the VM is managed by vCenter, but your current account does not have enough permissions to migrate the VM, access the target datastore, or change network and resource settings.

Solution:

Log in to vCenter Server and confirm that the VM is managed under the correct vCenter inventory. Then check whether your account has the required permissions for VM migration, host resources, datastore access, and network configuration. If possible, test with an administrator account. If the migrate option appears under another account, the issue is likely caused by insufficient permissions.

2. Storage vMotion Is Not Licensed or Configured

Problem:

If you want to move VM files to another host while the VM is powered on, Storage vMotion is required. When it is missing, not licensed, or misconfigured, the migrate VM greyed out problem may occur.

Solution:

Check your vSphere license and confirm whether it supports Storage vMotion. Then verify that each ESXi host has a VMkernel adapter enabled for vMotion and the vMotion network can communicate between hosts. If Storage vMotion is not available, power off the VM and use cold migration instead.

3. The Destination Host, Datastore, or Network Is Unavailable

Problem:

A VM cannot be migrated if the destination host, datastore, or network is unavailable. For example, the target host may be disconnected, lack enough CPU or memory, have no access to the required datastore, or miss the same port group used by the VM. This can make the migration wizard fail or keep the Migrate option unavailable.

Solution:

Check the target ESXi host status, available resources, datastore accessibility, and network configuration. Make sure the destination host can access the required storage and has the same virtual network or port group name. If the VM depends on a specific datastore or network, confirm that the destination host can use it before retrying migration.

4. CPU, EVC, Network, or Storage Compatibility Check Fails

Problem:

Even when both hosts look healthy, VMware may block migration if the source and destination hosts are not compatible. Common causes include different CPU generations, incorrect EVC settings, inconsistent network labels, or storage paths that are not available on the target host. This is a common hidden reason behind VMware VM migrate greyed out or failed migration checks.

Solution:

Run the migration compatibility check and review the detailed warning or error message. If the issue is CPU-related, check or adjust the EVC mode for the cluster. If it is network-related, standardize the port group names and mappings. If it is storage-related, make sure the target host can access the datastore or choose a migration method that also moves VM storage.

5. Local ISO, USB, RDM, Passthrough Device, or Snapshots Exist

Problem:

A VM may still be tied to the source host if it has a mounted local ISO, connected USB device, physical RDM disk, PCI passthrough device, or a complex snapshot chain. These settings can stop VMware from safely moving the VM to another host.

Solution:

Before migration, disconnect unnecessary ISO files, USB devices, and passthrough hardware. Check whether the VM uses RDM disks or special device mappings. Also review snapshots and consolidate them if needed. After removing host-dependent devices and cleaning up snapshots, try the migration again.

6. The VM or Host Is Locked by Maintenance Mode, Disconnection, or Running Tasks

Problem:

The migration option may be greyed out because an ESXi host is in maintenance mode, a host disconnected from vCenter, the host cannot synchronize with vCenter, or a VM already involved in backup, snapshot, cloning, or storage migration tasks.

Solution:

Check Recent Tasks and Events in vCenter to see whether another operation is running. Make sure the source and destination hosts are connected and not stuck in maintenance mode. Wait for active tasks to finish, reconnect the host if needed, and confirm the VM returns to a normal state before retrying migration.

More Tips for Migration

Even when the Migrate option becomes available, migration may still be affected by host compatibility, datastore access, network mapping, or unexpected VM errors. The following tips can help reduce migration risks and save time.

Tip 1. Back Up the VM Before Migration

Migration changes the VM running environment, so a backup gives you a recovery point if the VM fails to boot, data becomes unavailable, or the target host configuration does not work as expected.

Tip 2. Use a VM Migration Tool to Save Time and Effort

Manual troubleshooting can take time, especially when the migrate VM greyed out issue occured. If you need to migrate multiple VMs or want a simpler workflow, using a VMware VM migration tool can be more efficient.

Backup and Migration with Vinchin Backup & Recovery

Backup and migration can be handled in one workflow with one professional tool, such as Vinchin Backup & Recovery. It helps you protect the source VM before migration and then complete VMware VM migration easily and quickly.

Step1: Click Resources > Infrastructure > Virtual Platform to add the target VM.

Step2: Navigate to Backup>Virtualization to create a backup task and configure backup settings.

Step3: Once the backup task completes, click Data Resilience > Restore > Cross-Platform Restore to start VMware VM migration.

Want a safer and easier way to backup or migrate VMware VMs? Download and start a 60-day free trial of Vinchin Backup & Recovery to reduce migration risks, and simplify the whole process.

FAQs About VMware VM Migrate Greyed Out

Q1: How to enable vMotion on a host?

A1: To enable vMotion on a host, configure a VMkernel adapter for vMotion in vCenter. Select the ESXi host, go to Configure > Networking > VMkernel adapters, and enable the vMotion service on the proper VMkernel network.

Q2: Can I migrate a powered-on VM without vMotion? 

A2: No. A powered-on VM usually needs vMotion for live migration. If vMotion is not licensed or configured, you may need to power off the VM and perform cold migration, or use another migration method based on backup and restore.

Q3: Can a VMware VM migration tool help when the Migrate option is greyed out?

A3: Yes. If migration option is greyed out, a VMware VM migration tool can help move VMs through another workflow, such as backup and restore. For example, Vinchin Backup & Recovery can back up the source VM and restore it to the target host, datastore, and network, helping simplify VMware VM migration.

Sum up

The VMware VM migrate greyed out issue is usually caused by the six reasons above. In most cases, administrators can fix the problem by checking these factors one by one and then trying the migration again.

For complex environments, large numbers of VMs, or cases where native VMware migration is still limited, Vinchin Backup & Recovery offers a more efficient way to complete VMware VM migration. By backing up the source VM and restoring it to the target host, datastore, and network, it helps reduce manual troubleshooting work and provides a safer migration workflow.

Vinchin is participating in NCSS 2026, taking place from 7-9 July at the Putrajaya International Convention Centre (PICC), Level 1 Concourse, Perdana Hall & Green Zone, Putrajaya, Malaysia. During the three-day event, Vinchin is welcoming visitors at its booth in the China Pavilion, where the team is engaging with IT professionals, partners, and industry experts from across the region.

At the exhibition, Vinchin is presenting its enterprise backup and disaster recovery solutions, highlighting how organizations can strengthen data protection, improve cyber resilience, and ensure business continuity with secure, reliable, and cost-effective technologies.

The Vinchin booth has attracted strong interest from attendees seeking practical and scalable approaches to safeguarding critical data in today's evolving IT environment. During the event, Vinchin is also engaging in one-on-one, face-to-face discussions with customers from Southeast Asia, listening to their specific data protection requirements, sharing industry insights, and exploring how Vinchin’s solutions can better support their IT environments and business goals.

The company is using NCSS 2026 as an opportunity to strengthen connections with regional customers and partners, exchange insights, and demonstrate how its solutions can support modern enterprise infrastructure with flexible, efficient, and reliable data protection capabilities.

Vinchin invites all NCSS 2026 attendees to visit the China Pavilion and learn more about its latest backup and recovery offerings. The team looks forward to meeting more visitors throughout the event and exploring new opportunities for collaboration and growth.

About Vinchin

Vinchin provides reliable and scalable data protection solutions designed to meet the diverse needs of organizations of all sizes. Whether it's virtual machines, physical servers, NAS devices, or critical databases, our solutions ensure efficient and confident protection of business-critical data.

Virtualization platforms continue to evolve as organizations seek greater flexibility and lower infrastructure costs. While Microsoft Hyper-V remains popular in Windows-centric environments, many enterprises are gradually moving toward Linux-based virtualization platforms such as KVM (Kernel-based Virtual Machine).

Migrate for:

• Eliminating hypervisor licensing costs

• Better compatibility with Linux ecosystems

• Open-source flexibility

• Simple cloud-native deployment

Converting Hyper-V virtual machines to KVM is entirely possible with proper planning and migration methods.

Key Differences between Hyper-V and KVM

Before migration, it’s helpful to understand how these two hypervisors differ.

The largest technical challenge is that Hyper-V primarily uses VHDX virtual disks, while KVM commonly uses QCOW2 or RAW images.

Method 1: Convert VHDX to QCOW2 Using qemu-img

One of the most widely used approaches is qemu-img, part of the QEMU project.

Step 1. Shut down the Hyper-V VM

Ensure the VM is powered off to avoid converting a running disk to prevent filesystem corruption.

Step 2. Export the Hyper-V VM disk

In Hyper-V Manager, right-click the target VM and select Export to get the VHDX file.

Alternatively, use PowerShell:

Export-VM -Name "MyVM" -Path "C:\Exports\"

Make sure any active snapshots/checkpoints are merged before exporting. Exporting a VM with unmerged checkpoints can result in an inconsistent disk state.

Step 3. Transfer the VHDX to your KVM host

Use SCP, SMB, or any file transfer method that fits your network.

For large disks, verify the transfer with a checksum before proceeding.

Step 4. Convert the disk

On a Linux host with qemu-utils installed:

qemu-img convert -p -f vhdx -O qcow2 /path/to/disk.vhdx /path/to/output.qcow2

The -p flag shows the conversion process.

For a legacy VHD file, replace vhdx with vpc in the -f flag.

Step 5. Create the VM and attach the disk

On a KVM host managed by libvirt, create a new VM configuration using virt-install or a GUI like virt-manager, then attach the converted QCOW2 as the primary disk.

If the source was a Generation 2 Hyper-V VM (UEFI-based), configure the KVM VM with OVMF firmware rather than legacy BIOS.

Step 6. Install VirtIO drivers (Windows guests)

Install VirtIO drivers before conversion, or boot the VM with an emulated IDE controller first, install the drivers from the VirtIO ISO, and then switch to VirtIO.

Without them, Windows may fail to boot or detect storage devices.

Method 2: Use virt-v2v for Automated Conversion

For Linux environments, virt-v2v provides a more automated migration process.

Advantages include:

• Converts virtual disks

• Adjusts guest configuration

• Injects VirtIO drivers

• Optimizes the guest OS

• Supports direct migration workflows

Typical example:

virt-v2v -i disk Server01.vhdx -o local -os /var/lib/libvirt/images

virt-v2v is especially useful when migrating multiple Windows virtual machines.

Method 3. Restore Hyper-V Backup to KVM by Vinchin Backup & Recovery

Disk conversion is only one part of enterprise migration. Organizations also need:

• Backup verification

• Incremental synchronization

• Disaster recovery

• Cross-platform restore

• Minimal downtime

Vinchin Backup & Recovery can provide the needs above, and also enable:

• Protect Hyper-V workloads with image-based backups

• Restore Hyper-V virtual machines to KVM-based platforms

• Reduce migration complexity

• Preserve application consistency

• Support large-scale migration projects

Simple migration steps are as follows (take Proxmox as an example):

Step 1. Go to Data Resilience > Restore and choose Hyper-V as the restore point.

Step 2. Choose Proxmox as the target host.

Step 3. Set the restore strategy, like the schedule and transfer methods.

Step 4. Review and confirm that all settings are correct, then click Submit.

Wanna try the Vinchin method? Click the button below to have a 60-day full-featured trial!

Common Problems and How to Avoid Them

1. Blue screen on first boot (Windows guest)

Almost always a VirtIO driver issue.

Set the disk controller to IDE for the initial boot, install drivers from the VirtIO, then switch to VirtIO.

2. Network interface name changes

Both Linux and Windows guests may come up with different NIC names post-migration.

Have console access ready and plan for a network reconfiguration step after the VM boots.

3. Gen 2 Hyper-V VMs with UEFI

KVM needs to be configured with OVMF (UEFI) firmware for these VMs. On Proxmox, this also means adding an EFI disk and temporarily disabling Secure Boot.

4. Snapshots not carrying over

qemu-img converts the disk state at a point in time, Hyper-V snapshots don’t transfer.

Merge all snapshots in Hyper-V before exporting.

FAQs about Hyper-V to KVM

Q1: Can I convert a running Hyper-V VM to KVM without shutting it down?

It’s not recommended, as it is not safe with manual disk conversion. qemu-img works on a static image, if the VM is actively writing to the disk during conversion, you risk data corruption.

Q2: What’s the difference between Hyper-V Generation 1 and Generation 2 VMs for KVM migration?

Generation 1 VMs use legacy BIOS firmware and are generally simpler to migrate, creating a standard KVM VM with SeaBIOS.

Generation 2 VMs use UEFI firmware, which requires configuring the KVM VM with OVMF (UEFI) firmware, adding an EFI disk, and potentially disabling Secure Boot temporarily.

Conclusion

Migrating Hyper-V virtual machines to KVM is more than a simple disk conversion, it requires careful planning, compatible firmware settings, and proper driver preparation. Whether you choose qemu-img for manual conversion, virt-v2v for automated migration, or Vinchin Backup & Recovery for enterprise-scale cross-platform restoration, selecting the right approach helps minimize downtime and ensures a smooth transition to your new KVM environment.

Understanding why this happens prevents it from becoming a recurring crisis.

The Bin file overhead. When a VM is on, Hyper-V uses disk space equal to the VM’s RAM for caching, increasing a 100 GB VM with 16 GB RAM to about 116 GB. It is recommended to add 15% NTFS headroom, often overlooked by admins.

Dynamic disks don’t shrink automatically. Dynamic VHDX files expand as data is added but do not reclaim space when data is deleted.

Checkpoint accumulation. Each Hyper-V checkpoint creates an AVHDX differencing disk that can grow significantly. Old checkpoints may consume hundreds of gigabytes.

What Happens When Disk Space Runs Out?

According to Microsoft’s official documentation, when the host volume storing VHD/VHDX files runs out of space, Hyper-V logs these events in the ‘Microsoft-Windows-Hyper-V-VMMS-Admin’ log and pauses running VMs:

• Event ID 16050 (Warning): VM is about to run out of disk space

• Event ID 16060 (Error): VM has been paused due to insufficient disk space

VMs enter a "Critical-Paused" state. In Cluster Shared Volume (CSV) setups, only VMs on the node owning the affected CSV are impacted. Beyond pausing, guest applications may crash before a full pause occurs, and VMs that are powered off may refuse to start at all, returning:

Could not initialize memory: there is not enough space on the disk (0x80070070)

Back Up Before You Do Anything

Storage operations on virtual disks carry real risk. Before expanding, shrinking, or compacting a VHDX, take a backup.

Vinchin Backup & Recovery is built for exactly this scenario. It performs agentless, image-level, incremental backups of Hyper-V VMs, with no agents needed inside each guest. If a disk operation goes wrong, the Instant VM Recovery feature lets you resume operations directly from the backup in minutes rather than hours.

Vinchin works across Hyper-V, VMware, Proxmox, and other hypervisors and offers a 60-day full-featured free trial!

Fix 1: Clean Up Host Disk Space First

Before resizing anything, reclaim easy wins:

Delete orphaned VM files. Navigate to C:\ProgramData\Microsoft\Windows\Hyper-V\Virtual Machine and remove files from VMs that no longer exist in Hyper-V Manager.

Delete or merge old checkpoints. In Hyper-V Manager, remove unneeded checkpoints from the Checkpoint pane. Allow the merge to complete fully before proceeding, you cannot edit a VHDX while checkpoints exist.

Run Disk Cleanup on the host. Use cleanmgr.exe or dism/online/cleanup-image/startcomponentcleanup to clean Windows Update caches and temp files.

Fix 2: Compact a Dynamic VHDX (Reclaim Wasted Space)

Compacting reduces the physical VHDX file size on the host without changing the logical disk size seen by the guest. Use this when large amounts of data have been deleted inside the VM.

Via Hyper-V Manager:

Shut down the VM > Action > Edit Disk > Select the VHDX > Choose Compact > Finish.

Via PowerShell:

Mount-VHD -Path 'D:\VMs\MyVM.vhdx' -ReadOnly
Optimize-VHD -Path 'D:\VMs\MyVM.vhdx' -Mode Full

Fix 3: Expand the Hyper-V Virtual Disk (Add More Capacity)

Expansion is a two-stage process: resize the VHDX on the host, then extend the volume inside the guest.

Expand the VHDX

Hyper-V Manager:

Right-click VM > Settings > Hard Drive > Edit > Expand > enter new size > Finish.

PowerShell:

Expand VHDX to 200 GB:

Resize-VHD -Path "D:\VMs\MyVM.vhdx" -SizeBytes 200GB

Verify:

Get-VHD -Path "D:\VMs\MyVM.vhdx"

Per Microsoft's official 'Resize-VHD' documentation, SCSI-attached disks can be resized online (VM running); IDE-attached disks require the VM to be powered off. VHDX supports up to 64 GB.

Extend the volume inside the guest

Open Disk Management inside the VM > right-click the target volume > Extend Volume > follow the wizard.

Or via PowerShell inside the guest:

$MaxSize = (Get-PartitionSupportedSize -DriveLetter C).SizeMax
Resize-Partition -DriveLetter C -Size $MaxSize

If a Recovery Partition sits between the C: drive and unallocated space, the Extend Volume option will be greyed out. Use a partition tool to move it to the end of the disk first.

Fix 4: Shrink the Hyper-V Virtual Disk (Reduce Allocated Capacity)

Shrinking reduces the logical maximum size of the VHDX, which the guest OS sees as the total disk capacity. This requires careful preparation and carries more risk than expansion.

Key limitation: Resize-VHD can shrink only VHDX files, not the older VHD format. You also cannot shrink below the disk’s MinimumSize (the actual data footprint).

Step 1. Shrink the guest volume first

Inside the VM, open Disk Management > right-click the volume > Shrink Volume > specify how much to reduce.

Step 2. Shrink the VHDX on the host

Shut down the VM, then:

Hyper-V Manager: Edit Disk > Shrink > specify new size > Finish.

PowerShell:

Shrink to the minimum possible size:
Resize-VHD -Path "D:\VMs\MyVM.vhdx" -ToMinimumSize

Or shrink to a specific size:

Resize-VHD -Path "D:\VMs\MyVM.vhdx" -SizeBytes 80GB

Run Optimize-VHD before shrinking to consolidate free space and reduce the minimum size value.

FAQs about Hyper-V Not Enough Disk Space

Q1: Can I expand a Hyper-V disk while the VM is running?

Yes, in many cases. Hyper-V supports online expansion of VHDX files attached to SCSI controllers in supported guest operating systems. However, disks attached through IDE controllers typically require the virtual machine to be powered off before resizing.

Q2: Why is the Edit/Expand button greyed out in Hyper-V Manager?
Checkpoints exist for the VM. Delete all checkpoints and wait for the merge to complete before disk editing becomes available again.

Q3: How much free host disk space does a running Hyper-V VM need?
At minimum: VHDX size + VM RAM allocation (for BIN file) + ~15% NTFS overhead. A 100 GB VM with 16 GB RAM needs roughly 133 GB of free host space while running.

Conclusion

Hyper-V disk space problems are often preventable with proper storage management. By following the correct resize methods and backing up your VMs first, you can resolve issues safely and keep your virtual environment running smoothly.

What You Need Before Restoring a Proxmox VM

Before starting the restore process, make sure:

• The backup file or PBS snapshot is available

• The target storage has enough free space

• You’ve chosen the target node and VM ID

• The existing VM is powered off if you plan to overwrite it

Once these checks are complete, you’re ready to restore the VM using one of the methods below.

Method 1: Restore Proxmox VM Using the Proxmox Web Interface

The web interface is the easiest option for most administrators because it requires no command-line knowledge and is suitable for those who prefer a visual workflow and only restore VMs occasionally.

To restore a VM:

1. Log in to the Proxmox VE web interface.

2. Navigate to the storage that contains your backup files.

3. Open the Backups tab.

4. Select the backup archive you want to restore.

5. Click Restore.

A configuration window will appear where you can specify several restore options:

After confirming the settings, click Restore. Proxmox will recreate the virtual machine and restore its virtual disks and configuration from the selected backup.

Method 2: Restore Proxmox VM from Backup via the Command Line

If you prefer using the terminal or need to automate the restore process, Proxmox provides the qmrestore command. This method is especially useful for remote management, scripting, or batch operations.

Step 1. Log in to the Proxmox VE host via SSH or open the local shell.

Step 2. Locate the backup file you want to restore.

Step 3. Run the following command to restore the VM:

qmrestore <backup-file> <VMID>

For example:

qmrestore vzdump-qemu-100-2026_07_01-00_00_00.vma.zst 105

Step 4. (Optional) specify a target storage if you want to restore the VM to a different storage backend:

qmrestore vzdump-qemu-100-2026_07_01-00_00_00.vma.zst 105 --storage local-lvm

Step 5. Once the restore is complete, verify that the VM has been restored successfully and can boot naturally.

Tip: If the original VM still exists, restore the backup using a new VM ID first. This allows you to verify the restored VM before replacing the production instance.

Method 3: Restore a VM Backup From Proxmox Backup Server

If your backups are stored in Proxmox Backup Server, the restoration process is similarly straightforward while offering additional advantages such as deduplication and incremental backups.

To restore a VM from PBS:

1. Open the Proxmox VE web interface.

2. Select the configured Proxmox Backup Server Storage.

3. Browse the available backup snapshots.

4. Select the desired restore point and click Restore.

5. Configure the target node, VM ID, and storage and then start the restore process.

Because PBS stores backups incrementally, only unique data blocks are transferred and stored. This reduces storage consumption and can improve backup efficiency while still allowing complete VM restoration.

Simplify Proxmox VM Restore with Vinchin Backup & Recovery

While Proxmox VE provides built-in restore options, organizations often need more advanced recovery capabilities for business-critical workloads. Vinchin Backup & Recovery enhances Proxmox data protection with flexible recovery options, centralized management, and enterprise-grade disaster recovery features.

Key features include:

• Instant recovery for quick starting VMs from backup and minimizing downtime.

• Granular recovery to restore specific files without recovering the entire VM.

• Cross-host migration to migrate VMs between multiple hosts from Proxmox to VMware, Hyper-V, Xenserver, OpenStack, etc.

• Agentless backup without installing agents inside the guest OS.

• Multiple storage options(local disks, NFS Shares, iSCSI, etc) to specify restore destinations based on your needs.

• Backup verification to improve recovery reliability and reduce recovery risks.

To restore a Proxmox VM in Vinchin, you need to create a VM backup first and then follow the restore steps:

1. Navigate to Data Resilience > Restore, and choose the Proxmox backup storage you just created as the restore point.

2. Then select the target host and configuration settings to specify the restore destination.

3. Choose to restore the task right now or schedule it later and customize the restore strategies.

4. Check all the settings and click Submit to let the task run. Wait a few minutes; you’ll see the restored files on your new device.

Vinchin Backup & Recovery is designed to deliver reliable, hassle-free data protection for enterprises of all sizes while keeping customer needs at the center. You can start with a 60-day free trial to explore all features and evaluate the solution before purchasing.

Common Restore Errors and Solutions

While restoring a Proxmox VM is usually straightforward, you may encounter a few common issues. Here are the most frequent errors and how to fix them.

1. VM ID Already Exists

Cause: The target VM ID is already in use.

Solution: Use a different VM ID or remove the existing VM if it is no longer needed.

2. Insufficient Storage Space

Cause: The destination storage doesn't have enough free space.

Solution: Free up storage, expand the storage pool, or restore the VM to another datastore.

3. Backup File Not Found

Cause: The backup file is missing, or the storage isn't accessible.

Solution: Verify that the backup storage is mounted correctly and the backup file is available.

4. Corrupted Backup Archive

Cause: The backup file has been damaged or is incomplete.

Solution: Restore from another backup version and regularly verify backup integrity.

5. Permission or Access Errors

Cause: The target node cannot access the backup repository.

Solution: Check user permissions, storage credentials, and repository connectivity.

Best Practices to Ensure a Smooth Proxmox VM Recovery

Following a few best practices can help ensure successful VM recovery while minimizing downtime and data loss.

• Test backups regularly to verify they can be restored successfully.

• Keep multiple restore points in case the latest backup is corrupted.

• Restore to a new VM ID first to validate the backup before overwriting the original VM.

• Monitor available storage to avoid restore failures caused by insufficient capacity.

• Store backups offsite to protect against hardware failures and site-wide disasters.

Proxmox Restore VM from Backup FAQs

Q1: Can I restore a deleted Proxmox VM?

Yes. If a valid backup still exists, you can restore the deleted VM using the web interface, qmrestore, or Proxmox Backup Server.

Q2: Can I restore a VM with a different VM ID?

Yes. Assigning a new VM ID creates a separate VM without overwriting the existing one, making it ideal for testing or migration.

Q3: How long does it take to restore a Proxmox VM?

Restore time depends on factors such as the backup size, storage performance, and network speed. Small VMs may take only a few minutes, while larger workloads require more time.

Q4: Can I restore individual files from a VM backup?

The built-in Proxmox restore process is primarily designed to recover an entire VM. If you need file-level recovery, a third-party backup solution like Vinchin Backup & Recovery may be a better choice.

Conclusion

Restoring a Proxmox VM from backup is straightforward when you choose the right recovery method and follow best practices. Whether you use the web interface, the command line, or Proxmox Backup Server, regular backup testing and a reliable backup solution are essential for ensuring fast and successful VM recovery. But if you unlike manual operations, Vinchin Backup & Recovery offers you an automated and simplified restore process while maximizing efficiency.

The good news? In the vast majority of cases, the root cause falls into one of five clear categories. Understanding which bucket your problem belongs to is half the battle.

Before Starting Everything - Verify the Basics

A surprising number of Proxmox connectivity calls on the official forums turn out to be simple oversights. Before running a single diagnostic command, confirm:

Are you using HTTPS, not HTTP? Proxmox’s web interface does not respond to plain HTTP. You must use 'https://192.168.x.x:8006'. As noted in the Proxmox Support Forum, forgetting the 'https://' prefix is one of the common "connection refused" reports from newer users.

Are you including the port? The URL must end in ':8006'. Browsing to just the IP address won’t work.

Are the client and server on the same subnet? Proxmox, being an enterprise-oriented hypervisor, does not support Wi-Fi bridging. The server must be connected via Ethernet, and your client machine must be reachable from the same Layer 2 network or routed correctly.

Is the server actually powered on, and is the NIC showing link? A 'NO-CARRIER' state on the network interface means the cable is broken or the port can’t negotiate, regardless of what Proxmox’s configuration looks like.

Category 1: Nothing is Listening on Port 8006

This is the most decisive diagnostic you can run. SSH into your Proxmox host (or use the physical console) and execute:

ss -tlnp | grep 8006

If this returns nothing, 'pveproxy', the daemon responsible for serving the web interface, is not running. This is a "fix pveproxy" problem, not a firewall problem. Don’t adjust firewall rules until you confirm the service is actually up.

Why does pveproxy Stop Running

1. The service crashed or failed to start

systemctl status pveproxy
journalctl -u pveproxy -n 50 --no-pager

Common failure messages include TLS certificate errors, port binding conflicts, and dependency failures (pveproxy depends on 'pevdaemon' and 'pve-cluster '). Check those services too:

systemctl status pvedaemon
systemctl status pve-cluster

2. Disk space exhaustion

One underappreciated cause: when the root filesystem fills up, the Proxmox daemon silently fails to start or crashes mid-operation. Check with:

df -h

If / or /var are at or near 100%, free up space first (old logs, unused VM images, leftover update caches), then restart the service. As noted in the Proxmox Support Forum's long-running thread on GUI inaccessibility, disk space is "the cause of a lot of headaches" that gets overlooked in favor of more exotic explanations.

3. Corrupt or missing SSL certificate

'pveproxy' requires a valid TLS certificate stored under '/etc/pve/local/'. If those files are missing or malformed, the daemon won’t start. Regenerate them with:

pvecm updatecerts --force
systemctl restart pveproxy

This is especially common after storage failures, failed migrations, or on fresh installs where the cluster certificate store didn’t initialize cleanly.

Restart pveproxy once you know why it failed:

systemctl restart pveproxy

Blindly restarting without reading logs first is fine for a quick test, but if the service is crash-looping, it’s a red flag, the root cause needs to be addressed.

Category 2: Port 8006 is Listening, but You Still Can’t Connect

If 'ss -tlnp | grep 8006' shows pveproxy listening, the problem is between your client and the server. This is a network or firewall issue.

Confirm port reachability from the client machine:

nc -zv 192.168.x.x 8006

or

curl -k https://192.168.x.x:8006

If 'nc' times out instead of immediately refusing, the connection is being blocked or dropped somewhere in the path, not refused by the application.

Common Network-Level Blockers

Proxmox’s built-in firewall

The Proxmox firewall can be enabled at both the datacenter and node levels. If it’s on and there’s no explicit rule allowing TCP/8006 from your management subnet, you’ll be locked out. Temporarily disable it (from console or SSH) to test:

pve-firewall stop

If that immediately restores access, you need to add a proper ingress rule for port 8006 on your management interface.

Host-level iptables or nftables

Even with the Proxmox firewall off, kernel-level rules can block traffic, especially after package upgrades or if 'fail2ban' is installed. Check:

iptables -L -n | grep 8006
nft list ruleset | grep 8006

IP address conflict

If two devices on your network share the same IP address, your client may reach the wrong machine or get no response at all. Ensure your Proxmox node has a static IP that doesn’t overlap with any DHCP-assigned addresses.

Wrong binding interface

'pveproxy' binds to '\*:8006' by default, meaning all interfaces. But in certain misconfigured setups, it may only be reachable from localhost. Confirm with:

lsof -nP -iTCP:8006 -sTCP:LISTEN

You want to see '\*:8006' or your server's LAN IP, not '127.0.0.1:8006' only.

Category 3: TLS/SSL Certificate Problems

Browser behavior changes when the problem is TLS rather than TCP. You'll typically see the connection begin (no "connection refused") but then error out with certificate warnings, an abrupt disconnect, or a WebSocket error (code 1006).

The most common TLS scenario in established Proxmox installs is certificate expiry or corruption following a long uptime period. Proxmox's default self-signed certificates are valid for 10 years, but custom certs, or certs applied via Let's Encrypt, expire much sooner.

Diagnose with:

openssl x509 -in /etc/pve/local/pve-ssl.pem -noout -subject -dates

Check the 'notAfter' field. If it’s in the past, that’s your problem. Fix it:

pvecm updatecerts --force
systemctl restart pveproxy pvedaemon

If 'curl' connects but hangs during the TLS handshake, 'pveproxy' is listening but can't complete SSL negotiation, often due to a missing CA key file. In one documented Proxmox forum case, copying 'pve-root-ca.key' from another functioning node to a fresh install immediately resolved a hanging connection.

Category 4: Network Misconfiguration at the Infrastructure Level

These issues don’t manifest as a refused connection from Proxmox itself, they prevent your client from ever reaching the server at a routing level.

Incorrect gateway or subnet mask

The Proxmox installer prompts for IP, subnet, and gateway during installation. If those are wrong, the host can't communicate outside its immediate broadcast domain. Fix via the console:

nano /etc/network/interfaces
systemctl restart networking

Or from the GUI under Node > Network (if you can still reach the GUI from within the same segment).

vmbr0 bridge misconfiguration

Proxmox uses a Linux bridge ('vmbr0' by default) as its primary network interface. If the bridge isn't correctly linked to the physical NIC, the server appears unreachable even though the NIC has a link. Confirm the mapping:

ip addr
cat /etc/network/interfaces

The physical interface (e.g., 'enp1s0') should appear as a bridge slave under 'vmbr0'.

NIC driver issues

On some hardware, particularly 10GbE cards or certain Realtek adapters, Proxmox may not have a compatible driver for the kernel it's running. Users running Proxmox VE on systems with Realtek NICs have reported that opting into a newer kernel version (e.g., 6.14) resolved connectivity failures that showed no obvious misconfiguration. If your NIC shows 'NO-CARRIER' consistently, check 'dmesg' for driver errors and consider switching to the built-in NIC or an alternative kernel.

Category 5: Cluster and Quorum Issues

If your Proxmox node is part of a cluster, additional failure modes open up. When a quorum is lost, for example, if one node goes offline in a two-node cluster, the remaining node may refuse to serve the management interface as a safety measure.

Check cluster status from the console:

pvecm status
systemctl status corosync

If corosync is down or quorum is not met, resolve the cluster issue first. The web GUI returning after quorum is restored is expected behavior, it's not a bug.

When You Regain Access - Don’t Forget Your Backups

Here’s something that often comes up in the middle of a connectivity crisis: the realization that there are no reliable VM backups. Getting locked out of Proxmox for even a few hours tends to concentrate the mind on what would happen if the issue were more severe, a disk failure, ransomware, or a corrupted VM image.

This is where Vinchin Backup & Recovery comes in, it’s an enterprise-grade VM backup solution with native, deep support for Proxmox VE. It protects your virtual machines agentlessly, meaning no agent needs to be installed inside your guest operating systems, by interacting directly with the Proxmox hypervisor layer.

Key capabilities for Proxmox environments include:

• Changed Block Tracking (CBT)-based incremental backups: only changed data blocks are transferred after the first full backup, dramatically reducing backup windows in large PVE environments.

• Granular file-level restore: you don’t need to restore an entire VM just to recover a single file.

• Ransomware protection and data encryption: backup data is protected both in transit and at rest.

More features are provided, click the button below to enjoy a fully featured 60-day free trial! If you have problems during the process, just contact us directly, and we will provide you with solutions!

FAQs: Can’t Connect to Proxmox Server

Q1: Why does Proxmox show "connection refused"?

A "connection refused" message generally means the server is reachable, but no application is listening on the requested port. Restarting the pveproxy service and reviewing its logs can help identify the cause.

Q2: How do I access Proxmox if the web GUI is completely unavailable?

Use SSH: 'ssh root@<proxmox-ip>'. From there, you can manage VMs and containers via the command line using 'qm', 'pct', and 'pvesh' commands, and use 'systemctl' and 'journalctl' to diagnose and repair services. As a last resort, connect a keyboard and monitor directly to the Proxmox host and use the physical console.

Conclusion

Most Proxmox web GUI inaccessibility issues stem from network, service, SSL, or cluster problems. A systematic troubleshooting approach can quickly restore access, while regular monitoring and reliable VM backups with Vinchin Backup & Recovery help minimize downtime and keep your Proxmox environment resilient against unexpected failures.

French enterprise IT publication LeMagIT has recently featured Vinchin, recognizing the company's growing influence in the European market and its innovative approach to enterprise data protection. The in-depth report explores how Vinchin is helping organizations simplify backup management, strengthen cyber resilience, and protect increasingly complex IT environments through continuous product innovation.

In the interview with LeMagIT, Vinchin executives shared their perspectives on Europe's evolving backup landscape, the growing demand for ransomware resilience, and the company's vision for simplifying enterprise data protection.
As digital transformation accelerates and ransomware attacks become more sophisticated, enterprises are placing greater emphasis on building reliable, scalable, and cost-effective backup strategies. Organizations across Europe are actively looking for an enterprise backup solution Europe can depend on—one that not only ensures business continuity but also reduces operational complexity and long-term costs.

Reflecting on Vinchin's long-term commitment to the region, Minnie Du, International Sales Director at Vinchin, said: "We believe our simple, versatile, and cost-effective backup solution enables us to earn a strong position in the European market."

The interview also highlights Vinchin's strategy of strengthening local partnerships, expanding technical support capabilities, and delivering enterprise-grade backup solutions tailored to the evolving needs of European businesses.

Founded in 2015, Vinchin has rapidly grown into a global provider of enterprise data protection solutions. Today, the company serves customers in more than 180 countries and regions, supporting over 30,000 deployments and protecting more than 600,000 workloads worldwide. The unified Vinchin backup platform enables organizations to centrally manage backup and disaster recovery across virtual, physical, cloud, and hybrid environments while reducing administrative overhead.

One of the key topics discussed in the LeMagIT interview is Vinchin's implementation of the 3-2-1-1-0-0 backup rule. Building upon the widely adopted 3-2-1 backup strategy, Vinchin incorporates immutable backups, offsite protection, and zero-error verification to strengthen ransomware resilience and ensure backup integrity throughout the recovery process.

By integrating the 3-2-1-1-0-0 backup rule into its backup architecture, Vinchin helps enterprises establish a more resilient data protection strategy while improving compliance with increasingly stringent cybersecurity and regulatory requirements.

Another major advantage highlighted in the interview is Vinchin's agentless backup architecture, which simplifies deployment by eliminating the need to install backup agents inside virtual machines. This approach reduces management overhead while enabling organizations to efficiently protect heterogeneous environments through a unified management platform.

Beyond backup, Vinchin continues to innovate in cross-platform workload migration. Neil Zhuo, Technical Director at Vinchin, explained: "We don't simply convert VM formats. Our migration technology also modifies virtual machine drivers to eliminate compatibility issues after migration—an exclusive capability that sets Vinchin apart from conventional solutions."

This proprietary technology enables organizations to migrate workloads between heterogeneous virtualization platforms with minimal disruption, ensuring higher migration success rates while reducing operational risks. Combined with comprehensive support for VMware, Hyper-V, Proxmox VE, XCP-ng, OpenStack, oVirt, RHV, OLVM, AWS EC2, and many other platforms, Vinchin provides enterprises with a unified solution for backup, disaster recovery, and infrastructure migration.

With flexible licensing models, including perpetual options and subscription-based pricing, Vinchin helps organizations optimize backup pricing strategies while maintaining enterprise-grade protection. As a result, Vinchin is increasingly recognized as a compelling Veeam alternative for enterprises seeking to balance performance with total cost of ownership. Rather than replacing existing infrastructure, Vinchin enables organizations to maximize the value of their current IT investments, leveraging its global resources and partner ecosystem, while adopting a modern, scalable, and future-ready data protection strategy.

The growing demand for cyber resilience, hybrid cloud adoption, and regulatory compliance is reshaping the enterprise backup landscape across Europe. Businesses now require backup platforms that combine reliability, operational simplicity, and advanced security capabilities. Through continuous innovation in agentless backup technology, implementation of the 3-2-1-1-0-0 backup rule, and ongoing investment in the European market, Vinchin is well positioned to support enterprises navigating these evolving challenges.

The recognition from LeMagIT reflects Vinchin's expanding visibility in Europe and reinforces its commitment to delivering modern backup solutions for organizations worldwide. As the company continues to strengthen its regional partner ecosystem and invest in technological innovation, Vinchin remains dedicated to helping enterprises build resilient, secure, and future-ready data protection strategies.

Read more: https://www.lemagit.fr/actualites/366645357/Sauvegarde-Vinchin-le-chinois-qui-veut-remplacer-Veeam

About LeMagIT

LeMagIT is one of France's leading enterprise IT media publications and a member of the TechTarget network. The publication provides authoritative coverage of enterprise infrastructure, cloud computing, cybersecurity, storage, backup, and digital transformation, serving IT professionals and business decision-makers across the French-speaking market.

Understanding ESXi vs Proxmox Architecture

Before starting the migration, it's helpful to understand the key architectural differences between ESXi and Proxmox VE.

VMware ESXi is a proprietary Type-1 hypervisor that uses the VMFS file system and typically stores virtual disks as VMDK files. Virtual machines are managed through vCenter Server or the ESXi Host Client, making it a popular choice in enterprise environments.

Proxmox VE is an open-source virtualization platform built on Debian Linux. It combines KVM for virtual machines and LXC for containers while supporting multiple storage backends such as local storage, LVM, ZFS, Ceph, and NFS. Instead of relying solely on VMDK files, Proxmox commonly uses raw or QCOW2 disk formats.

Understanding these differences helps minimize compatibility issues after migration.

Pre-Migration Checklist

Proper preparation helps ensure a smooth migration and minimizes downtime. Before importing an ESXi VM into Proxmox, check the following:

1. Back up the virtual machine

Create a full backup before migration so you can quickly recover if any issues occur.

2. Check OS compatibility

Most modern Windows and Linux systems are supported, but older operating systems may require additional drivers or BIOS/UEFI adjustments.

3. Verify storage capacity

Ensure the Proxmox host has sufficient storage for the imported VM and future growth.

4. Record the VM configuration

Note the VM's CPU, memory, disk layout, network settings, firmware (BIOS/UEFI), and boot order so they can be recreated in Proxmox.

5. Remove unnecessary snapshots

Delete or consolidate old snapshots to reduce disk size and simplify the migration.

6. Update VMware Tools (Optional)

Updating VMware Tools before exporting the VM helps ensure a clean shutdown and a more consistent disk state. After migration, replace VMware Tools with VirtIO drivers and the QEMU Guest Agent.

Method 1: Export OVA/OVF from ESXi and Import to Proxmox

One of the simplest ways to migrate an ESXi VM is by exporting it as an OVA/OVF package and importing the virtual disk into Proxmox. It preserves the VM configuration while packaging the virtual disks into transferable files.

Steps:

1. Shut down the VM in ESXi.

2. Export the VM as an OVA or OVF package.

3. Transfer the exported files to the Proxmox host using SCP, SFTP, rsync, or another file transfer method.

For example:

scp myvm.ova root@proxmox-ip:/var/lib/vz/template/

4. Create a new VM in Proxmox.

5. Import the VMDK disk into the new VM:

qm importdisk 100 myvm.vmdk local-lvm

Replace 100 with your VM ID and local-lvm with your target storage.

6. Attach the imported disk to a VirtIO SCSI controller, configure the boot order, and start the virtual machine.

Method 2: Convert VMDK to QCOW2 Using qemu-img

For administrators who prefer command-line tools or need greater flexibility, converting the VMDK disk directly into QCOW2 is another popular option.

The qemu-img utility supports conversion between multiple virtual disk formats, including VMDK, QCOW2, RAW, VHD, and VHDX.

Steps:

1. Copy the VMDK file from ESXi to the Proxmox server.

2. Convert the disk:

qemu-img convert -f vmdk source.vmdk -O qcow2 destination.qcow2

If you prefer a raw disk image:

qemu-img convert -f vmdk source.vmdk -O raw destination.raw

QCOW2 supports snapshots and thin provisioning, while RAW generally offers slightly better performance.

3. Create a new VM in Proxmox without adding a virtual disk during the wizard.

4. Import the converted disk:

qm importdisk 100 destination.qcow2 local-lvm

Alternatively, move the disk manually into the target storage if your storage backend supports it.

5. Attach the imported disk and start the VM.

Method 3: Direct Disk Migration

For large virtual machines, directly copying the VMDK from the ESXi datastore to Proxmox can save time and avoid creating intermediate OVA files.

Steps:

1. Enable SSH on the ESXi host.

Navigate to Host > Manage > Services and enable the SSH service if it’s not already running.

2. Copy the VMDK file from the Proxmox server:

scp root@esxi-ip:/vmfs/volumes/datastore1/MyVM/MyVM.vmdk /tmp/

Or use rsync for better resume capability during large transfers.

rsync -av root@esxi-ip:/vmfs/volumes/datastore1/MyVM/ /tmp/MyVM/

3. Import the disk into Proxmox:

qm importdisk 100 /tmp/MyVM.vmdk local-lvm

4. Attach the imported disk and configure VM settings.

Method 4: Migrate VMware ESXi to Proxmox with Vinchin Backup & Recovery

Manual migration methods work well for a small number of virtual machines, but they become increasingly time-consuming when migrating dozens or hundreds of workloads. For enterprise environments, using a professional backup and migration solution can significantly simplify the process.

Vinchin Backup & Recovery provides agentless backup and instant recovery for over 15 virtualization platforms, including VMware and Proxmox.It supports flexible backup strategies with full, incremental, and differential backups. Its built-in cross-platform VM migration allows you to restore VMware backups directly to Proxmox without manually converting VMDK files or rebuilding virtual machines, significantly reducing migration time and effort.

The migration workflow is straightforward:

1. Create a backup job for the source ESXi virtual machine.

2. After the backup is complete, go to the Restore page and select the backup you created as the restore point.

3. Select the Proxmox host as the target destination, then configure the VM settings as needed.

4. Choose whether to restore the VM immediately or schedule the restore for a later time.

5. Review the configuration, click Submit to start the restore task, and verify that the VM boots successfully after the job is complete.

Vinchin Backup & Recovery is trusted by enterprises worldwide and is committed to delivering reliable data protection for virtualized environments. Download the free 60-day trial to explore its features and help protect your critical data from loss and cyber threats.

Bonus Tips for Post-Migration Deployment

After successfully importing the virtual machine, several post-migration tasks should be completed before placing the workload into production.

1. Install VirtIO drivers

For Windows virtual machines, install the latest VirtIO drivers to improve storage and network performance. Linux distributions typically include the necessary drivers by default, although updating the initramfs may be required in some cases.

2. Install QEMU Guest Agent

The QEMU Guest Agent enables better communication between Proxmox and the guest operating system, supporting features such as graceful shutdowns, IP reporting, and backup consistency.

3. Verify network connectivity

Confirm that the virtual NIC is attached to the correct bridge, update network settings if necessary, and verify communication with other systems.

4. Check application functionality

Boot the operating system and verify that critical services, databases, and business applications are functioning correctly.

5. Remove VMware Tools

After confirming the VM operates normally on Proxmox, uninstall VMware Tools and replace them with the QEMU Guest Agent and VirtIO drivers to avoid potential conflicts.

6. Create a new backup

Once the migration has been validated, create a fresh backup under the new Proxmox environment to establish a reliable recovery point.

Import ESXi VM to Proxmox FAQs

Q1: Can Proxmox import VMDK files directly?

Yes. Proxmox can import VMDK virtual disks using the qm importdisk command. Depending on your storage backend, you may also convert the VMDK to QCOW2 or RAW before attaching it to the virtual machine.

Q2: Which disk format is better for Proxmox: QCOW2 or RAW?

QCOW2 supports snapshots, thin provisioning, and compression, making it ideal for most deployments. RAW generally delivers slightly better I/O performance and is often preferred for performance-critical workloads.

Q3: Do I need to reinstall the guest operating system after migration?

No. In most cases, the existing operating system can boot normally after the virtual disk is imported. You may only need to install VirtIO drivers, update boot settings, or adjust firmware options.

Q4: Why won't my migrated VM boot in Proxmox?

Common causes include incorrect boot order, BIOS/UEFI mismatches, missing VirtIO drivers, incompatible storage controllers, or incomplete disk conversion. Reviewing these settings usually resolves most boot issues.

Sum Up

Migrating an ESXi VM to Proxmox can be achieved using OVA/OVF export, qemu-img, direct disk migration, or Vinchin Backup & Recovery. Choose the method that best fits your environment, and always back up, verify compatibility, and test the migrated VM to ensure a smooth and reliable transition.

Nowadays, companies gradually consider migrating XenServer to VMware. Compared to VMware, XenServer offers weaker centralized management, a smaller ecosystem, and lower hardware and software compatibility, along with a more limited talent pool in enterprise environments. Common migration scenarios include:

• Centralized management: Move XenServer VMs to VMware for host, VM, storage, network, and permission management.

• Third-party ecosystem: Migrate when backup, monitoring, security, or disaster recovery tools integrate better with VMware.

• Compatibility: Choose VMware when new hardware, drivers, OS, or applications are better supported on VMware.

• Talent pool: Move to VMware when VMware admins, consultants, and support resources are easier to find.

If you also need to migrate XenServer to VMware, the next sections will walk you through the key preparations, available migration methods, and practical steps.

Preparation Before Migrating XenServer to VMware

Before starting the migration, complete the following checks to improve the success rate and make rollback easier if the migrated VM cannot run properly:

• Record the VM configuration, including CPU, memory, disk size, network settings, firmware mode, and so on.

• For production workloads, confirm the application owner, approved maintenance window, and rollback point.

• Back up the source VM, including virtual disks, snapshots, VM configuration, and critical application data.

• Remove unused virtual hardware, unmount ISO images, delete redundant NICs, and disconnect unnecessary devices.

• Clean up the guest OS by uninstalling Xen Tools, removing temporary files, and checking file system integrity.

How to Migrate Xen VM to VMware?

The following three methods have different advantages and limitations. You can quickly compare them first, locate the best suitable way for you, and click the title to view details directly.

mkdir xen-vm

cat xen-vm/Ref\:1/[0-9]* > xen-vm.raw

qemu-img convert -f raw -O vmdk xen-vm.raw xen-vm.vmdk

Fixes: Common Issues After XenServer to VMware Migration

1. The Migrated VM Cannot Boot    

This issue is usually caused by a firmware mismatch, incorrect boot order, or an incompatible disk controller. To resolve it, ensure the VMware VM matches the source BIOS/UEFI mode, set the converted disk as the primary boot device, switch to a compatible SCSI or SATA controller if needed, and run OS boot repair if the bootloader is corrupted. Before the final cutover, having a reliable XenServer backup and fast recovery plan can also help you restore the source VM quickly if the migrated VM fails to boot.

2. The Network Adapter Is Missing or IP Settings Are Lost    

After migration, the guest OS may detect a new virtual NIC, causing static IP settings to be lost or remain bound to the old Xen adapter. To resolve this, remove unused Xen devices, assign a compatible adapter type such as E1000E or VMXNET3, install VMware Tools or open-vm-tools, and reconfigure IP, DNS, gateway, and VLAN settings.

3. The Converted VMDK Cannot Be Attached or Powered On    

Some VMDK files generated by conversion tools may not match the disk format expected by ESXi. Verify that the conversion completed successfully and ensure all descriptor and extent files are properly uploaded. If ESXi rejects the disk, clone it to a new datastore format using the following command:

vmkfstools -i source.vmdk -d thin target.vmdk

Then attach the newly created VMDK to the VMware VM and retry the boot process.

4. Performance or Driver Warnings Appear After Migration    

Old Xen drivers and missing VMware Tools can cause device warnings, slow storage, clock drift, or lower network throughput. Uninstall Xen Tools if it remains in the guest, install VMware Tools or open-vm-tools, check storage and NIC drivers, and review system logs before returning the VM to production. For deeper troubleshooting, see this guide about VMware log analysis.

FAQs About Migrating Xen VM to VMware

Q1: Should I uninstall Xen Tools before migrating Xen VM to VMware?    

A1: In many cases, yes. Xen Tools may leave drivers or services that are no longer needed after the VM runs on VMware. To avoid driver conflicts, uninstall Xen Tools before migration if possible, or remove them after the VM boots successfully on VMware.

Q2: Can I migrate a running XenServer VM to VMware without shutting it down?    

A2: In most manual migration workflows, no. The VM should be powered off before export or disk conversion to keep the disk data consistent.

Q3: How much downtime is needed to migrate XenServer VM to VMware?    

A3: Downtime depends on the VM size, disk amount, migration method, network speed, and post-migration validation. Manual export and disk conversion usually require longer downtime because the VM must be exported, converted, uploaded, and tested.

Q4: Can I migrate XenServer VM to VMware without manual conversion?    

A4: Yes. A cross-platform migration tool such as Vinchin Backup & Recovery can simplify the process by using a backup and restore workflow instead of asking administrators to manually convert each disk.

Conclusion

When you need to migrate Xen VM to VMware, manual methods such as exporting Xen VMs as OVA/OVF or converting XVA to VMDK can be acceptable for one or two non-critical VMs.  

For production workloads, batch migration, or tight maintenance windows, a V2V migration tool such as Vinchin Backup & Recovery can be a safer choice. It reduces repeated manual operations, keeps backup points available during the process, and provides a guided migration workflow to make VM migration easier and more reliable.

Backup deduplication is a storage optimization technique that eliminates duplicate data before it is written to disk.

Instead of saving every backup as a complete copy, the backup software identifies identical data blocks and stores them only once. Future backups simply reference the existing data.

How does Proxmox Backup Server Deduplication Work?

PBS uses content-defined chunking (CDC) instead of fixed-size blocks. This is an important distinction.

Rather than dividing every file into equal-sized blocks, PBS dynamically determines chunk boundaries based on the data itself.

The process works as follows:

1. VM data is read during backup.

2. Data is divided into variable-sized chunks.

3. Each chunk receives a cryptographic hash.

4. PBS checks whether that hash already exists.

5. Existing chunks are referenced.

6. Only new chunks are stored.

Several advantages are provided:

• Higher deduplication ratios

• Better handling of file modifications

• Efficient incremental backups

• Reduce storage growth over time

How Much Storage Can Deduplication Save?

Actual savings depend on workload characteristics.

Typical environments experience results similar to the following:

The more similar the virtual machines are, the greater the deduplication ratio.

Long-term retention also increases storage efficiency because only changed chunks are added over time.

Real-World Deduplication Ratios: What to Expect

One of the most common questions in the Proxmox community is “Why isn’t my deduplication ratio higher?” The answer is almost always workload composition.

Based on data from the Proxmox Support Forum, cloud-PBS providers, and backup sizing tools across the ecosystem, here’s a practical breakdown:

The more your VMs share common OS bases and application stacks, the better your ratio.

Where Native Proxmox Backup Deduplication Has Limits

PBS is purpose-built for Proxmox VE, and within that context it’s excellent. But there are real scenarios where organizations need more:

1. Multi-hypervisor environments. Most enterprises don’t run Promxox exclusively. If your infrastructure includes VMware vSphere, Hyper-V, or XenServer alongside Proxmox VE, PBS doesn’t back up those platforms. You end up managing separate backup systems, each with their own storage pool, and no cross-platform deduplication.

2. Cross-platform VM migration. Teams migrating workloads between hypervisors (say, from VMware to Proxmox after the Broadcom acquisition) need tools that handle the transition gracefully, not just PBS pointing at Proxmox-native storage.

3. Enterprise compliance and reporting. PBS is powerful but administratively lean. Organizations subject to audit requirements, HIPAA, PCI DSS, and SOC 2 need centralized reporting, RBAC with fine-grained permissions, and formal verification workflows that go beyond what PBS provides out of the box.

4. Cloud archival and 3-2-1-1-0 compliance. While PBS added S3 datastore support in recent versions, integrating it into a complete 3-2-1 or 3-2-1-1-0 backup architecture with object locking for immutability requires additional configuration and tooling.

Enterprise-Grade Deduplication for Proxmox and Beyond

For organizations that need more than PBS alone can provide, Vinchin Backup & Recovery is one of the few enterprise backup solutions with deep, native Proxmox integration alongside support for 15+ other virtualization platforms.

Vinchin’s data reduction stack for Proxmox environments includes:

• Deduplication and compression are applied at the backup job level, reducing storage footprint across both incremental and full backups.

• Changed Block Tracking (CBT) for Proxmox VE, which ensures only modified disk blocks are transferred during incremental backups, keeping daily backup windows small even for multi-TB VMs.

• Unified management console for Proxmox VE, VMware vSphere, Hyper-V, oVirt/RHV, Oracle OLVM, XenServer, KVM, OpenStack, ZStack, and more, all from a single interface.

• Instant VM recovery that mounts backup data via NFS and boots a failed VM in approximately 15 seconds, directly addressing tight RTO requirements

• Ransomware protection through backup storage, write-protection, and encryption, giving organizations a recoverable copy that ransomware cannot reach

Proxmox backup deduplication steps:

Step 1. Choose the Proxmox VM as the source under Backup > Virtualization.

Step 2. Choose the backup destination you want.

Step 3. Configure the backup strategies, you can open the data deduplication in the Data Storage Policy.

Step 4. Confirm your settings, and then click Submit.

For teams evaluating backup solutions for mixed-platform environments, Vinchin offers a fully functional 60-day free trial with no VM count restrictions during the trial period.

FAQs about Proxmox Backup Deduplication

Q1: Does Proxmox VE include deduplication by default?

No. Deduplication is provided by Proxmox Backup Server (PBS), not by Proxmox VE itself. If backups are stored on a standard directory, NFS share, or CIFS/SMB storage, deduplication is not available.

Q2: Is deduplication performed across all backup versions?

Yes. PBS uses global chunk-level deduplication, allowing identical chunks to be reused across different backup versions, virtual machines, and backup jobs.

Q3: Does encryption disable deduplication?

No. PBS performs deduplication before encryption.

Conclusion

Smarter backups start with smarter storage. Whether you're relying on PBS for Proxmox or scaling to a hybrid infrastructure with Vinchin, deduplication is the key to reducing costs, improving efficiency, and keeping your data protected without unnecessary overhead.

The trigger rarely has anything to do with ESXi itself being unstable or outdated. The technology still works fine, what changed is the contract: perpetual licenses are gone, subscription tiers are now mandatory, and renewal quotes no longer fit the budget many teams had planned around.

Organizations are increasingly adopting Proxmox VE as a cost-efficient alternative with strong KVM-based virtualization capabilities and built-in management tools.

At the same time, Proxmox has significantly improved its migration tooling, especially with the introduction of the VM Import Wizard in newer releases.

Method 1: The Built-in ESXi Import Wizard (Recommended for Most Teams)

This is now the path Proxmox itself recommends. Proxmox VE 8.2 introduced a built-in ESXi Import Wizard, and by the 9.x series, it has become the recommended first-choice method for most migrations. Functionally, it’s an integrated VM importer that uses Proxmox’s storage plugin system to import the VM as a whole, mapping most of its configuration directly into Proxmox VE’s config with reduced downtime compared to manual conversion.

Step 1. Confirm version and patch level

Make sure your Proxmox VE installation is on version 8 or higher, with the latest available system updates applied.

Step 2. Add the ESXi host as an import source

In the Proxmox web UI, go to Datacenter > Storage > Add > ESXi, and enter the domain or IP address along with admin credentials. 

If the ESXi instance uses a self-signed certificate, either add the CA to your system trust store or check the Skip Certificate Verification box.

Step 3. Browse, select, and import

The wizard connects to your VMware environment and lists available VMs along with their configurations.

You select the VM, review the mapped settings, and start the import.

Power down the source VM before importing.

Method 2: Manual Export and Disk Conversion (OVF/OVA + qemu-img)

For older ESXi versions, vSAN-backed storage, or situations where you simply want more granular control, the manual route is the reliable fallback. The OVF/OVA method works as a fallback regardless of ESXi version.

Step 1. Export from vSphere

In the vSphere Client, right-click the VM and select Export OVF Template, choosing OVA for a single-file export or OVF for a folder of separate files.

Alternatively, the VMDK files can be accessed directly on the ESXi datastore over SSH or SCP.

Step 2. Transfer files to the Proxmox host

Use SCP, rsync, or a shared NFS mount to move the exported files to the Proxmox host.

Step 3. Convert the disk format

VMware’s VMDK format isn’t natively used by Proxmox storage backends, so it needs to be converted:

Convert to qcow2 (most common, supports snapshots)

qemu-img convert -f vmdk -O qcow2 MyVM-disk1.vmdk MyVM-disk1.qcow2

Or convert to raw for ZFS / LVM-backed storage

qemu-img convert -f vmdk -O raw MyVM-disk1.vmdk MyVM-disk1.raw

These two qemu-img invocations cover the two most common Proxmox storage scenarios: qcow2 for general use, raw for ZFS or LVM storage.

Step 4. Create the VM shell and import the disk

qm importdisk 200 MyVM-disk1.qcow2 local-lvm
qm set 200 --scsi0 local-lvm:vm-200-disk-0

After conversion, create a new VM in Proxmox with the desired configuration, import the converted disk, then attach it, checking the importdisk output for the exact disk name it assigns.

Step 5. Match the original configuration exactly

Create the new VM with the same parameters as the original, CPU, memory, network cards, and virtual disk.

At the OS step, select the same guest OS that was set for the original VMware VM.

Match BIOS or UEFI to whatever boot mode the source VM used, getting this wrong is one of the most common reasons a migrated VM won’t boot.

Method 3. The Easiest Migration with Vinchin Backup & Recovery

In enterprise environments, manual migration is often not enough, especially when multiple VMs, production workloads, or backup consistency are required.

In this case, Vinchin Backup & Recovery provides a V2V workflow layered on top of its core backup engine:

Agentless, cross-platform V2V migration. Vinchin's V2V migration allows agentless, seamless VM migration between any two virtualizations among the platforms it supports, useful whether you're replacing your virtual environment outright or running a hybrid setup during the transition.

Backup-driven migration, not a one-shot script. Rather than converting disks, Vinchin lets you migrate data from one Proxmox host to another virtual platform or back again, whether you're switching workloads for more agile operations or performing a quick recovery in a hybrid environment. This means the same backup you'd take for protection purposes doubles as your migration source.

Built-in data protection during the move. Vinchin's incremental backup support means only data that has changed since the last backup needs to be transferred during migration, which meaningfully reduces bandwidth consumption and storage requirements compared to re-copying full disks every time.

Here is how to migrate VMware to Proxmox:

Tip: Make sure you already have a VMware backup in Vinchin.

Step 1. Go to Data Resilience > Restore and choose VMware VM as the recovery data source.

Step 2. Select Proxmox as the restore destination.

Step 3. Configure the restore strategies as you want.

Step 4. Review and confirm the set is correct, then click Submit.

For teams that want to test the workflow before committing, Vinchin offers a 60-day full-featured free trial, with engineers available to support testing and help troubleshoot the migration directly.

Common Issues After Migration

1. Windows Boot Failure (0x7B)

Usually caused by missing VirtIO drivers.
Fix:

• Temporarily switch the disk to IDE/SATA

• Install VirtIO drivers

• Switch back to VirtIO SCSI

2. Linux Fails to Boot

Cause: missing storage drivers in initramfs
Fix:

Rebuild initramfs (update-initramfs -u or dracut -f)

3. Network Not Working

Cause: NIC mismatch (VMXNET3 → VirtIO)
Fix:

Reconfigure the network adapter in Proxmox

Performance Tips After Migration

Once VMware VMs are running on Proxmox:

• Install QEMU Guest Agent for better integration

• Switch to VirtIO SCSI for disk performance

• Enable CPU type: host for performance parity

• Test network throughput after migration

• Remove VMware Tools safely

FAQs for VMware to Proxmox

Q1: Can I migrate both Windows and Linux VMs from VMware to Proxmox?

Yes, Proxmox supports migration of both Windows and Linux VMware virtual machines, Windows guests need an explicit VirtIO driver step that Linux guests generally don’t.

Q2: Does the Import Wizard preserve old VMware snapshots?

No, the Import Wizard primarily imports the current VM state, old VMware snapshots should be consolidated before migration rather than relied upon to carry over.

Q3: Do I need to uninstall VMware Tools before migration?

Not required before migration, but strongly recommended after switching to Proxmox.

Conclusion

Migrating from VMware to Proxmox is no longer a complex or risky process. Whether you choose Proxmox's built-in Import Wizard for simplicity, manual conversion for greater control, or Vinchin Backup & Recovery for enterprise-scale, backup-driven migration, careful planning is the key to a smooth transition.

Citrix Hypervisor, also known as XenServer, is a virtualization platform for creating, running, and managing virtual machines. Many IT teams still refer to it as XenServer, so when they search for XenServer backup solutions, they are usually looking for reliable ways to protect Citrix Hypervisor VMs. 

Citrix Hypervisor allows enterprises to run multiple virtual machines on a physical server, enabling business applications, databases, file services, and other workloads to run independently while using the same hardware resources. 

Why Backup Citrix Hypervisor VMs Is Important？

Citrix Hypervisor VMs often run databases, ERP systems, file services, and other core business workloads. When a VM crashes, a virus attack damages data, or an administrator deletes files by mistake, these workloads may become unavailable or unrecoverable.

The impact is not limited to the failed VM itself. Business applications can stop running, daily operations may be interrupted, and important data can be permanently lost. Without usable backups, teams may also fail to meet RPO and RTO targets, making recovery slower and more uncertain.

Thus, a reliable backup strategy is important and it helps businesses keep recoverable VM copies, reduce data loss, shorten downtime, and support disaster recovery when unexpected failures happen.

Common Methods About How to Backup Citrix Hypervisor VMs

There are several ways to back up Citrix Hypervisor VMs: export VMs manually, use snapshots, and back up via professional software. These Citrix Hypervisor backup solutions fit different needs, from one-time VM copies to automated protection for production workloads.

Method 1: Export Citrix Hypervisor VMs Manually

Exporting VMs manually is a basic way to backup Citrix Hypervisor VMs when you only need a one-time copy. Although it is not ideal for frequent backup, it can work for small environments or temporary protection.

Here is the command to export a VM manually:

xe vm-export vm=<vm-name> filename=<backup-file>

Manual export is simple, but it is slow for frequent Citrix Hypervisor backup tasks or many VMs.

Method 2: Use Snapshots for Short-Term VM Protection

Snapshots are useful when you need a quick rollback point before making changes to a VM. For example, you can take a snapshot before installing patches, changing application settings, or updating the operating system. Here are the steps to create a snapshot on Citrix Hypervisor VMs:

• Select the VM in the Resources pane > Snapshots

• Click Take Snapshot, right-click the Properties pane > Take Snapshot

• On the VM menu, select Take Snapshot

• Enter the name of the new snapshot and an optional description> specify your Snapshot mode

• Click OK to begin creating the snapshot. Progress is displayed on the status bar and on the Events view under Notifications.

Snapshots are fast and convenient, but they still depend on the original VM and storage. Keeping them for a long time will increase storage usage and affect performance, so they are better for temporary rollback rather than long-term Citrix Hypervisor VM backup.

Method 3: Use Professional Citrix Hypervisor Backup Software

Professional backup software is designed for environments where VMs need regular protection and reliable disaster recovery. Instead of depending on manual export or short-term snapshots, backup software can help create scheduled backup jobs, manage retention policies, monitor backup status, and restore VMs when needed. 

Tools such as Vinchin Backup & Recovery can help automate Citrix Hypervisor VM backup, reducing manual work and making the recovery process easier to manage. 

How Vinchin Backup & Recovery works:

Step 1: Connect the virtual platform: Go to Resources > Infrastructure > Virtual Platform > Add, select Citrix Hypervisor, and enter the connection information.

Step 2: Create the backup task: Go to Backup > Virtualization, select the target VMs, and click Next.

Step 3: Select backup storage: Choose the target node, such as local disks or NAS.

Step 4: Configure the strategy: Set the schedule, backup type, and security options such as WORM Protection or Malware Scan. 

Step 5: Confirm and submit: Review the settings and submit the backup job.

With Vinchin Backup & Recovery, you can ensure fast, reliable data protection and business continuity. Click the Download Free Trial button below to start your 60-day free trial with all features unlocked.

More Tips for Choosing the Most Suitable Method and Tool

Still not sure which method to choose? The table below compares the pros and cons of each Citrix Hypervisor backup solution. For easier operation, scheduled backup, and reliable recovery, professional software such as Vinchin Backup & Recovery is usually the better choice.

In a word: manual export and snapshots help in limited cases, but production environments usually need professional backup software for consistent protection.

Best Practices for Secure Citrix Hypervisor VM Backup

A secure backup strategy needs clear recovery goals, proper scheduling, safe storage, and regular restore testing.

• Define RPO and RTO before setting backup frequency.

• Schedule backups based on workload importance and data change rate.

• Avoid relying only on snapshots for long-term recovery.

• Keep multiple restore points and follow the 3-2-1 backup rule.

• Store at least one copy away from the production environment.

• Test VM restore regularly and fix failed backup jobs quickly.

FAQs About Citrix Hypervisor VM Backup

Q1: Are Citrix Hypervisor snapshots enough for VM protection?

A1: No. Snapshots are useful for short-term rollback, but they are not designed for long-term data protection.

Q2: How often should I backup Citrix Hypervisor VMs?

A2: Backup frequency should match data change rate and acceptable data loss. Critical VMs that run databases, ERP systems, or customer-facing services may need daily or more frequent backup. Lower-priority VMs can use a lighter schedule.

Q3: Does Citrix Hypervisor support incremental backup?

A3: Citrix Hypervisor backup support incremental backup when it is handled by a backup tool, like Vinchin Backup & Recovery. 

Q4: What should a Citrix Hypervisor disaster recovery plan include?

A4: A Citrix Hypervisor disaster recovery plan should include regular VM backups, offsite backup copies, defined RPO and RTO targets, and tested restore workflows to make sure critical VMs can be recovered after hardware failure, ransomware, or accidental deletion.

Conclusion

Citrix Hypervisor VM backup can be handled through manual export, snapshots, or professional backup software. Manual export is useful for one-time protection, snapshots help before updates, and backup software is better for regular VM protection and faster disaster recovery.

For production environments, a planned backup strategy is the safer path. Regular VM backup helps reduce data loss, control recovery time, and prepare for hardware failure, accidental deletion, ransomware, or failed updates. Teams that need a more controlled way to protect Citrix Hypervisor VMs can consider Vinchin Backup & Recovery for automated backup and restore workflows.

"Hi guys, we’re backing up our Exchange Server using Windows Backup on Hyper-V, which stores data in VHDX format. What’s the best way to convert VHDX to VMDK in a VMware environment?" 

This question usually comes up when moving workloads from Hyper-V to VMware, where disk format compatibility becomes a key requirement. This article will cover three common methods for converting VHDX to VMDK, along with post-migration deployment steps and best practices to ensure a smooth transition.

VHDX vs VMDK: Key Differences

VHDX is a modern virtual disk format used by Microsoft Hyper-V, designed to improve reliability, performance, and scalability over the older VHD format.

VMDK is the virtual disk format used by VMware products such as ESXI and VMware Workstation for running virtual machines.

After reviewing the comparison table, you should now have a clear understanding of both formats. Next, let’s dive into the detailed conversion methods.

3 Methods to Convert VHDX to VMDK

There are several ways for the format conversion, ranging from simple GUI-based tools to more advanced manual methods. The right approach depends on your technical experience, VM size, and whether you need a quick conversion or a more controlled migration process.

Method 1: Using StarWind V2V Converter

StarWind V2V converter is one of the simplest and most widely used tools for virtual disk conversion.

1. Download and install StarWind V2V Converter;

2. Select the source file (VHDX);

3. Choose the target format as VMDK;

4. Select conversion type (thin or thick provisioned if required);

5. Start the conversion process and wait for completion.

Best for: quick, user-friendly conversion without complex setup

Method 2: Using qemu-img

This is a powerful command-line utility widely used for converting virtual disk formats between different platforms.

1. Install QEMU tools (which include qemu-img);

2. Open a terminal or command prompt;

3. Run the conversion command:

qemu-img convert -f vhdx -O vmdk source.vhdx output.vmdk

4. Wait for the conversion process to complete;

5. Attach the converted VMDK file to a VMware virtual machine.

Best for: advanced users who need fast, flexible, and scriptable disk conversion.

Method 3: Manual Conversion

This method is more advanced and is usually used when tools are not available.

1. Convert VHDX to VHD if required;

2. Export or attach the disk in Hyper-V;

3. Rebuild or import the VM into VMware;

4. Adjust boot settings and fix drivers if needed.

Best for: complex environments or troubleshooting special cases

Flexible VHDX to VMDK Conversion with Vinchin Backup & Recovery

While the above methods are suitable for individual or small-scale VHDX to VMDK conversion, they can become complex and inefficient in enterprise environments. Vinchin Backup & Recovery provides a unified data protection and migration platform that supports both Hyper-V and VMware, enabling seamless cross-platform VM migration.

Vinchin inherently supports virtual disk conversion between VHDX and VMDK formats during the restore process, and it offers centralized management, batch VM migration, and policy-based automation, making it a good option to minimize downtime and improve data consistency for large-scale environments.

To migrate Hyper-V VM to VMware, you need to create a Hyper-V backup first, and then follow the steps below:

1. After finishing the Hyper-V VM backup task, switch to the Restore page in Vinchin Backup & Recovery.

2. Locate and select the completed Hyper-V backup copy from the backup list.

3. Pick VMware ESXi as the target virtual platform for restoration.

4. Submit the restore task; Vinchin will automatically convert VHDX to VMDK in the background during restoration, with no separate manual disk conversion required.

You can now download the 60-day free trial version to explore Vinchin’s full-featured backup and migration capabilities, and experience a more efficient way to manage VHDX to VMDK scenarios in enterprise environments.

Post-migration Configuration

After converting and importing the VHDX disk into VMware, several post-migration steps are required to ensure the virtual machine runs properly and maintains optimal performance.

• Install VMware Tools

This is essential for improving performance, enabling proper driver support, and ensuring smooth integration with the VMware environment. It helps with display, network, and disk optimization.

• Network Adapter Adjustment

After migration, the virtual network interface may change. Reconfigure network settings to ensure the VM can access the network correctly.

• Startup Repair (Windows / Linux)

If the VM fails to boot, perform a startup repair to fix bootloader or kernel-related issues caused by the platform change.

• Disk Expansion Check

Verify whether the virtual disk size is correctly recognized. If not, extend the partition inside the guest OS to utilize the full capacity.

Best Practices for a Smooth VHDX to VMDK Disk Conversion

To ensure a smooth and safe VHDX to VMDK migration process, it is important to follow several best practices that reduce risk and improve efficiency.

1. Backup the original VHDX file

Always keep a full backup before starting the conversion to prevent data loss in case of failure.

2. Use SSD storage for conversion

Performing disk conversion on SSD storage significantly improves speed and reduces processing time.

3. Maintain the same disk controller type

Keep the virtual disk controller consistent (e.g., SCSI or SATA) to avoid boot issues after migration.

4. Be careful with dynamic disks

Dynamic disks may cause compatibility or conversion issues. It is recommended to convert them to basic disks before migration if possible.

VHDX to VMDK FAQs

Q1: What is the easiest way to convert VHDX to VMDK?

The easiest method is to use a GUI-based tool such as StarWind V2V Converter. It allows users to select the VHDX file and directly export it to VMDK with minimal configuration, making it ideal for quick conversions.

Q2: Can I convert VHDX to VMDK without losing data?

Yes, data can be preserved during conversion if the process is done correctly. However, it is strongly recommended to back up the original VHDX file before starting any conversion to avoid unexpected data loss.

Q3: Does VMware support VHDX files directly?

No, VMware does not natively support the VHDX format. The disk must be converted to VMDK or migrated using tools such as qemu-img, StarWind V2V Converter, or enterprise solutions like Vinchin.

Conclusion

Converting VHDX to VMDK is essential for Hyper-V to VMware migration. Depending on your needs, you can use GUI tools like StarWind, command-line utilities like qemu-img, or manual methods. For enterprise environments, Vinchin Backup & Recovery offers a more automated approach. By selecting the right approach and following the best practices, you can ensure a smooth and reliable virtual machine migration with minimal downtime.

A VMware virtual machine is not a single file, it is a folder on a datastore containing several components that together define the machine’s identify and it’s data.

Delete different file types have different purpose:

• .vmx - VM configuration (hardware, boot order, network)

• .vmdk - Virtual disk data

• -flat.vmdk - Actual disk contents (raw blocks)

• .nvram - BIOS/UEFI firmware settings

• .vmsd - Snapshot metadata

• -delta.vmdk - Snapshot delta files

• .log - VMware log files

VMware surfaces two fundamentally different actions, and confusing them is the most common source of trouble:

Checklists Before You Delete

A short checklist before any deletion:

Verify you have a backup: A VMware snapshot is not a backup, it depends on the original disk chain and is destroyed alongside the VM when you delete from disk.

Check network dependencies: Is the VM running a DNS server, domain controller, database, or load balancer that other systems rely on?

Check for IP/MAC reservations: Static IPs or DHCP reservations associated with the VM may need to be released.

Export or archive if uncertain: An OVF/OVA export preserves the VM in a portable format that can be re-imported later.

Power off: Always shut down the guest OS first. A hard power-off risks disk corruption inside the VM’s file system.

Method 1. vSphere Client

The vSphere Client is the standard interface for environments managed by vCenter Server. This is the most common method in enterprise data centers.

Shut down the VM:
1. Open a browser and log in to the vSphere Client using your vCenter credentials.

2. In the left navigation tree, go to Virtual Machine and Templates or use the Hosts and Clusters view to locate the target VM.

3. If the VM is running, right-click it > Power > Shut Down Guest OS. This sends a graceful ACPI shutdown through VMware Tools. If VMware Tools is unresponsive, use Power Off as a fallback. 

4. Wait until the VM status shows Powered Off in the Summary tab before proceeding.

Delete from Disk:

1. Right-click the powered-off VM in the inventory tree.

2. Select Delete from Disk from the context menu. 

3. A confirmation dialog will appear. Click Yes, vCenter will remove the VM from inventory and delete all associated files from the datastore.

Method 2. ESXi Host Client

If you manage a standalone ESXi host not connected to vCenter, use the ESXi Host Client directly.

1. Open a web browser and navigate to https://<ESXi-host-IP>. Log in with administrator credentials (typically root).

2. In the left sidebar, click Virtual Machines.

3. Select the VM you want to remove. If it is powered on, right-click it > Power > Shut down. Confirm and wait for it to reach the Power Off state. 

4. Right-click the powered-off VM > Delete (some ESXi versions show this as Delete from disk). 

5. Click Yes in the confirmation prompt. The ESXi host will unregister the VM and remove all its files from the local datastore.

Deleting via SSH/ESXi Shell:

When a VM appear as invalid or orphaned and the GUI options are greyed out, SSH access to the host and vim-cmd can resolve it:

1. List all registered VMs and their VMIDs

vim-cmd vmsvc/getallvms

2. Power off the VM (replace 42 with your VMID)

vim-cmd vmsvc/power.off 42

3. Destroy the VM (removes from inventory + deletes files)

vim-cmd vmsvc/destroy 42

Method 3. VMware Workstation & Fusion

VMware Workstation (Windows/Linux) and VMware Fusion (macOS) are used for desktop virtualization and development labs. Deletion here removes files from the local disk rather than a networked datastore.

VMware Workstation (Pro/Player)

1. Open VMware Workstation and locate the VM in the Library panel on the left.

2. If the VM is running, power it off: VM menu > Power > Shut Down Guest. 

3. Right-click the VM in the library > Manage > Delete from Disk. 

Alternatively: Select the VM, then go to the top menu VM > Manage > Delete from Disk.

4. Click Yes to confirm. The VM is moved to the Recycle Bin on Windows. Empty the Recycle Bin afterward to fully reclaim disk space.

VMware Fusion (macOS)

1. Open VMware Fusion. From the Virtual Machine Library, right-click the VM you want to remove.

2. Select Delete from the context menu, then confirm.

Method 4. PowerCLI (Scripted/Bulk Deletion)

PowerCLI is VMware’s PowerShell-based automation framework, ideal for deleting multiple VMs, automating cleanup tasks, or integrating deletion into broader orchestration pipelines.

Delete a single VM:

1. Connect to vCenter

Connect-VIServer -Server vcenter.company.local -User admin@vsphere.local -Password 'YourPassword'

2. Power off the VM if running

Stop-VM -VM "OldWebServer01" -Confirm:$false

3. Delete from disk (permanently removes all files)

Remove-VM -VM "OldWebServer01" -DeletePermanently -Confirm:$false

Bulk deletion: remove all VM matching a naming pattern

1. Delete all VMs whose names start with "Test-" (use caution)

Get-VM -Name "Test-*" | ForEach-Object {
    if ($_.PowerState -eq "PoweredOn") {
        Stop-VM -VM $_ -Confirm:$false
    }
    Remove-VM -VM $_ -DeletePermanently -Confirm:$false
    Write-Host "Deleted: $($_.Name)"
}

Cleaning Up Orphaned Files in the Datastore

Sometimes a VM is removed from the vCenter inventory but its files remain in the datastore. This is common after a failed migration, a host disconnection, or when Remove from Inventory was used instead of Delete from Disk. The result: waste storage space that is invisible from the VM list.

Delete orphaned VM folders via vSphere Client:

1. In the vSphere Client, go to Storage in the left navigation.

2. Select the datastore where the orphaned VM folder resides.

3. Click Datastore Browser.

4. Locate the VM folder by name. Confirm it corresponds to the decommissioned VM, check the .vmx file for the VM name if unsure.

5. Select the entire VM folder and click Delete.

Protect VMware VMs Before Deletion with Vinchin Backup & Recovery

The single most common regret after deleting a VMware VM is discovering there was no backup.

Vinchin Backup & Recovery provides agentless, image-based backup for VMware environments, enabling administrators to protect entire virtual machines, including operating systems, applications, configuration files, and virtual disks, without disrupting production workloads.

• Forever incremental backup with CBT (Changed Block Tracking)

• Instant VM Recovery to reduce downtime

• Granular file-level recovery

• Cross-platform VM migration and restoration

• Automated backup scheduling and retention policies

• Support for immutable backup storage to strengthen ransomware resilience

Step-by-step to protect VMware VMs:

Step 1. Choose your VMware VM to backup under Backup > Virtualization.

Step 2. Select the backup destination (cloud object storage, local disk, NFS share, and iSCSI).

Step 3. Configure backup strategies, like schedule and retention policy.

Step 4. Review and confirm the backup setting, then click Submit.

Integrating backup into your VM lifecycle management allows you to safely remove unnecessary virtual machines while keeping critical workloads recoverable. Now, download Vinchin Backup & Recovery to enjoy the full-featured free trial for 60 days!

FAQs

Q1: What files are deleted when I choose Delete from Disk in VMware?

Delete from Disk removes the entire VM folder from the datastore, including: the configuration file (.vmx), virtual disk descriptor and data files (.vmdk, -flat.vmdk), snapshot delta files (-delta.vmdk), snapshot metadata (.vmsd), NVRAM/BIOS file (.nvram), and VMware log files (.log).

Q2: Is it safe to delete a VM if it has snapshots?

Technically, yes, Delete from Disk will remove the VM along with all of its snapshot delta files.

Conclusion

By distinguishing between Remove from Inventory and Delete from Disk, following the appropriate deletion method for your VMware environment, and verifying dependencies beforehand, you can avoid accidental data loss and unnecessary downtime.

Most importantly, always create a reliable backup before deleting production workloads. With Vinchin Backup & Recovery, you can protect VMware VMs, simplify recovery, and confidently manage your virtual infrastructure throughout its lifecycle.

Why Back up Hyper-V VM to an External Drive?

Backing up Hyper-V VMs to an external drive helps solve several real-world risks that users commonly face.

Data safety: accidental deletion or VM corruption can happen at any time, and an external backup ensures you always have a recoverable copy.

Disaster recovery: In case of a system crash or hardware failure, a backup stored on an external drive enables quick restoration with minimal downtime.

Ransomware protection: keeping backups offline reduces the risk of ransomware encrypting both production and backup data.

Storage flexibility: external drives provide an easy and scalable way to expand backup storage without modifying the main server infrastructure.

Must-Have Preparations

Before backing up the Hyper-V VM, make sure the following requirements are met to avoid  errors and incomplete backups.

1. Windows with Hyper-V enabled

You need a system running Windows Server or Windows 10/11 Pro with the Hyper-V role installed and properly configured.

2. External hard drive (USB / SSD / HDD)

A reliable external storage device is required to store the VM backup files. Make sure it is properly connected and recognized by the system.

3. Sufficient storage space

Ensure the external drive has enough free space to accommodate the full size of the virtual machine, including its virtual disks and configuration files.

4. Administrator privileges

Administrator access is required to perform export, backup, or PowerShell operations in Hyper-V Manager.

5. Run or properly shut down the VM

The virtual machine should be in a stable state. For consistent backups, it is recommended to shut down the VM before starting the backup process.

Overview of 5 Methods: Which One Should You Choose?

In the following parts, we’ll elaborate on these five methods and show you the operation steps in detail.

Method 1: Export Hyper-V VM to External Drive

The built-in Export feature in Hyper-V Manager allows you to create a full backup of a virtual machine, including its configuration, virtual disks, and checkpoints (if selected), and save it to an external drive.

Step 1: Launch Hyper-V Manager on your Windows system and locate the virtual machine you want to back up.

Step 2: Shut down the VM to ensure data consistency and avoid potential corruption.

Step 3: Right-click the target VM and select Export from the menu.

Step 4: Browse and select your external hard drive (USB, SSD, or HDD) as the export location. Make sure the drive has enough free space.

Step 5: The process may take time depending on VM size. Once completed, the backup folder will contain all VM data.

 This method is best for users who want a simple, built-in way to create a full backup without installing additional software.

Method 2: Copy VHDX Files Manually

You can also back up a Hyper-V VM by manually copying its VHDX file to an external drive. This method is suitable for quick backups but does not include the VM configuration or checkpoints.

Step 1: Shut down the VM

Power off the virtual machine to ensure the VHDX file is in a consistent state.

Step 2: Locate the VHDX file

Find the virtual disk file in the folder where the VM is stored.

Step 3: Copy the file

Copy the VHDX file to your external USB drive, HDD, or SSD.

This is best for quickly copying a VM’s virtual disk for temporary storage or migration, but not as a complete backup solution.

Method 3: Use PowerShell Backup Script

PowerShell provides a quick and efficient way to export a Hyper-V virtual machine to an external drive, making it ideal for automation and batch backups.

Step 1: Open PowerShell as Administrator

Launch Windows PowerShell with administrator privileges.

Step 2: Run the Export command

Use the following command to export the VM to your external drive:

Export-VM -Name "VMName" -Path "E:\HypervBackup"

Replace VMName with the name of your virtual machine and E:\HyperVBackup with the destination folder on your external drive.

Step 3: Verify the backup

After the command completes, confirm that the exported VM files are stored in the specified location.

This method is best for administrators who need to automate or batch multiple VM backups.

Method 4: Back Up Hyper-V VM with Windows Server Backup

Windows Server Backup is a built-in feature that allows you to back up Hyper-V virtual machines to an external drive. It supports scheduled backups and is suitable for Windows Server environments.

Step 1: Install Windows Server Backup

Open Server Manager and install the Windows Server Backup feature if it is not already installed.

Step 2: Launch Windows Server Backup

Open the tool and select Backup Once or Backup Schedule.

Step 3: Select the backup items

Choose Hyper-V or the virtual machine you want to protect.

Step 4: Choose the external drive

Select your external USB drive, HDD, or SSD as the backup destination, then start the backup.

This is best for Windows Server environments that require scheduled backups using built-in tools.

Method 5: Easily Back Up Hyper-V with Vinchin Backup & Recovery

While the methods above are suitable for basic Hyper-V backup needs, they often rely on manual processes and offer limited automation and recovery flexibility. For organizations that require a more secure and efficient approach to back up Hyper-V VMs to external drives, Vinchin Backup & Recovery provides a more robust alternative.

Vinchin uses an agentless architecture to enable VM backups without installing agents, reducing overhead and simplifying deployment. It supports 15+ virtualization platforms, including Hyper-V, VMware, and Proxmox, making it suitable for hybrid and multi-cloud environments. It also ensures Hyper-V security with encryption, immutable storage, and ransomware protection.

Here are the Hyper-V backup steps in Vinchin:

1. Go to VM Backup > Backup, and expand the VM list to select the Microsoft Hyper-V host as the backup source.

2. Specify the backup destination by choosing the target node and storage, here you can add the external drive in advance and then select it.

3. Customize the backup strategies, schedule the backup daily, weekly, or monthly combined with incremental, full, or differential backups, and complete the retention policy as well.

4. Check the settings you chose, and click Submit to run the backup task.

Vinchin Backup & Recovery is a trustworthy backup solution designed for both small and large-scale enterprises. To protect your hybrid and multi-cloud environments, you just need to download the 60-day free trial version.

Back Up Hyper-V VM to External Drive FAQs

Q1: Is copying a VHDX file enough to back up a Hyper-V VM?

Not completely. Copying only the VHDX file backs up the virtual disk but does not include the VM configuration, checkpoints, or network settings. For a complete backup, use Export or a dedicated backup solution.

Q2: How much storage space do I need for a Hyper-V VM backup?

The required space depends on the size of the virtual machine. As a best practice, ensure your external drive has at least the same amount of free space as the VM's used storage, plus additional capacity for future backups.

Q3: Can I schedule Hyper-V backups to an external drive?

Yes. Windows Server Backup supports scheduled backups. You can also automate Export-VM with PowerShell and Task Scheduler, or use dedicated backup software for more flexible scheduling and retention policies.

Q4: Can I restore a Hyper-V VM from an external drive?

Yes. If you exported the VM, you can restore it using Import Virtual Machine in Hyper-V Manager. If you only copied the VHDX file, you'll need to create a new VM and attach the existing virtual disk.

Sum Up

External drives offer a simple and reliable way to protect Hyper-V VM backups. This article covered five backup methods, including Hyper-V Manager, PowerShell, Windows Server Backup, manual VHDX copying, and Vinchin Backup & Recovery. For organizations that need automated backups, centralized management, and fast recovery, Vinchin provides a more efficient solution.

Proxmox Backup Server is a dedicated, standalone system for backing up virtual machines, containers, and even physical hosts in a Proxmox environment.

PBS delivers several capabilities that distinguish it from simply copying VM disk files:

• Client-side deduplication

• Incremental backups after the initial full backup

• AES-256-GCM encryption

• Built-in integrity verification

• Remote sync and tape support

PBS integrates into Proxmox VE by appearing as a storage target under Datacenter > Storage > Add > Proxmox Backup Server. Once registered, every node on a PVE cluster can immediately use it for scheduled or on-demand backups.

Prerequisites: What You Need Before You Start

Before walking through the connection steps, make sure the following prerequisites are in place:

Hardware Requirements for PBS:

• CPU: A 64-bit AMD or Intel processor with at least four cores (more cores improve parallel backup performance).

• RAM: At least 4 GB for the OS and Proxmox services, plus approximately 1 GB of RAM per terabyte of datastore capacity.

• Storage: A separate disk (or ZFS pool) dedicated to the PBS datastore, using the OS disk for backup storage is not recommended in production.

• Network: A stable connection between the PBS host and all Proxmox VE nodes. TCP port 8007 must be open.

Deployment Options: Dedicated vs. Co-located

Proxmox supports two deployment approaches for PBS. The recommended production approach is to install PBS on dedicated physical hardware (separate from PVE nodes). For homelabs or resource-constrained environments, PBS can be installed alongside PVE on the same machine at the OS level, not inside a container, by adding the pbs-no-subscription repository and installing the proxmox-backup-server package directly on the host.

Step-by-Step: Connect Proxmox Backup Server to Proxmox VE

Follow this guide to connect and set up Proxmox Backup Server:

Step 1. Install Proxmox Backup Server

Download the official PBS ISO from pbs.proxmox.com, write it to a USB drive using Rufus or balenaEtcher, and boot your target server.

Step 2. Configure a Datastore on PBS

Log in to the PBS web interface, navigate to Administration > Storage/Disks

Select the unused disk, click Initialize Disk with GPT, then create a directory (or a ZFS pool if you need RAID protection). 

Once the filesystem or ZFS pool is ready, navigate to Datastore > Create Datastore

Step 3. Create a Dedicated Backup User and API Token

Rather than using the root account, it is best practice to create a dedicated user with limited privileges. On the PBS host, run:

proxmox-backup-manager user create backup@pbs --password 'StrongPassword'
proxmox-backup-manager token create backup@pbs backup-token \
  --privileges DatastoreBackup,DatastoreAudit

This creates an API token named backup-token with exactly the permissions needed: DatastoreBackup for writing backups and DatastoreAudit for reading and verifying them.

Step 4. Retrieve the PBS Server Fingerprint

When PBS uses its default self-signed certificate, Proxmox VE needs the server’s TLS fingerprint to authenticate the connection and prevent man-in-the-middle attacks.

On the PBS dashboard, look for the Show Fingerprint button in the summary pane. Alternatively, run:

proxmox-backup-client login --repository <PBS-IP>:8007:<datastore-name>

Step 5. Add PBS as a Storage Target in Proxmox VE (GUI Method)

Log in to the Proxmox VE web interface at https://<PVE-IP>:8006. Ensure the Datacenter node is selected in the left-hand sidebar.

Navigate to Storage > Add > Proxmox Backup Server, then fill in the following:

• ID - A unique name for this PBS storage

• Server - IP address or hostname of the PBS host

• Username - backup@pbs!backup-token (token-based) or root@pam (root login)

• Password/Token - The API token value or root password

• Datastore - The datastore name created in Step 2

• Fingerprint - Paste the SHA-256 fingerprint from Step 4 (omit if using a trusted cert)

• Encryption (optional) - Enable client-side encryption for at-rest data protection

Click Add, Proxmox VE will attempt to connect to PBS, fetch available datastores, and register the storage. 

If the connection succeeds, the new PBS storage will appear under every node in your cluster automatically, it does not need to be added per node.

Step 6. Schedule and Run Your First Backup Job

In the Proxmox VE GUI, select Datacenter in the left panel, then navigate to the Backup tab and click Add. 

Then configure:

• Node: Choose All to cover every node in the cluster, or restrict to specific hosts

• Storage: Select the PBS storage ID you just created

• Schedule: Set a cron-style schedule (e.g., daily at 23:59, weekly on Sunday)

• Mode: Snapshot mode is the most common choice for live VMs — it creates a temporary snapshot for consistency without shutting down the VM

• Retention: Set per-job retention policies (keep-last, keep-daily, keep-weekly, keep-monthly) to control how many versions PBS retains

For an immediate test, right-click any VM or container in the sidebar and select Backup > Backup now.

Bonus: Restoring a Virtual Machine

Recovery is just as important as backup.

To restore:

Open Storage > PBS, select Backup > Restore 

Select destination node

Configure VM ID

Start restoration

Recovery speed depends primarily on storage performance and network bandwidth.

When Native PBS Is Not Enough: Introduce Vinchin Backup & Recovery

Proxmox is an excellent native solution for protecting Proxmox VE workloads. But organizations operating mixed virtualization environments manage multiple administrative overheads, creating blind spots in recovery coverage.

Vinchin Backup & Recovery comes to the rescue, it’s an enterprise-grade data protection platform supporting 15+ virtualization platforms from a single web-based console.

Key Features for Proxmox Environments:

• Agentless backup via hypervisor API: No software installed inside guest VMs.

• Instant VM recovery: Restore a VM and bring it online in as little as a few seconds by running it directly from the backup data.

• Ransomware protection: Real-time I/O monitoring blocks unauthorized write operations directly to backup storage.

• Cross-platform VM migration (V2V): Move VMs bidirectionally between any two supported platforms, including from VMware or Hyper-V to Proxmox.

Backup Proxmox environment with Vinchin:

Step 1. In Backup > Virtualization, choose your Proxmox VM to back up

Step 2. Choose the backup destination

Step 3. Configure the desired backup strategies (mode, schedule, retention policy, etc.)

Step 4. Confirm your backup setting, and click Submit

A 60-day full-featured free trial is available via the download button below, allowing teams to evaluate the platform on real workloads before committing.

FAQs

Q1: Do I need the fingerprint if I use a Let’s Encrypt certificate on PBS?

No, when PBS uses a certificate signed by a public CA, Proxmox VE can verify the connection through the system VA trust chain without a fingerprint.

Q2: Can I connect multiple Proxmox VE clusters to one Proxmox Backup Server?

Yes, multiple Proxmox VE nodes and clusters can use the same PBS instance, provided adequate storage capacity and network bandwidth are available.

Q3: Can I use local storage instead of PBS?

Yes, Proxmox VE supports backups to local directories, NFS, SMB, and other storage types. However, PBS provides deduplication, incremental backups, integrity verification, and optimized storage efficiency that general-purpose storage lacks.

Conclusion

A successful backup strategy starts with a reliable backup platform. By connecting Proxmox Backup Server to Proxmox VE, you gain efficient, secure, and scalable protection for your virtual workloads. As your infrastructure grows, solutions like Vinchin Backup & Recovery can provide centralized management and advanced recovery capabilities to keep your business running with confidence.

 "I’m configuring backups for my Proxmox virtual machines, but I’m not sure which backup mode I should use. There are three options: Snapshot, Stop, and Suspend, and each seems to work differently. Any advice may be appreciated."    

Choosing the right backup mode in Proxmox VE is essential to protecting your virtual machines. Each backup mode uses a different approach to create backups, resulting in different levels of VM interruption, backup consistency, and hardware or storage requirements. In this article, we’ll introduce these three backup modes in detail, compare their advantages and limitations, and help you determine which option is best for your data backup strategies.

What Are Proxmox Backup Modes?

Proxmox offers three backup modes for virtual machines: Snapshot, Suspend, and Stop. Here’s an overview of each mode:

The following sections explain how each backup mode works, list their advantages and limitations, and help you select the best option that matches your current business environment.

Snapshot VS. Suspend VS. Stop Backup Mode

Snapshot Mode

How it works: creates a point-in-time image of the VM using storage-level snapshots while the virtual machine continues running. Proxmox then performs the backup based on this snapshot, allowing the VM to remain online throughout the process.

Pros:

• Minimal or near-zero downtime

• Fast backup process with storage snapshot support

• Suitable for most production workloads

• Can work with QEMU Guest Agent for better consistency

Cons:

• Requires snapshot-capable storage (e.g., ZFS, LVM, Ceph)

• May produce crash-consistent backups without proper configuration

• Slight performance overhead during snapshot creation

Suspend Mode

How it works: pauses the VM’s execution state (CPU and memory) while the backup is created. Once the backup process starts, the VM is frozen temporarily and then resumed after completion, preserving its state during the backup window.

Pros:

• Provides consistent backup by freezing VM state

• Works even when snapshot mode is not available

• Better consistency than live snapshot in some environments

Cons:

• VM is temporarily unavailable during backup

• Longer pause time for memory-heavy VMs

• Not suitable for latency-sensitive applications

Stop Mode

How it works: performs a full shutdown of the virtual machine before the backup begins. After the backup is completed, the VM is powered back on, ensuring a clean and consistent state at the file system level.

Pros:

• Highest level of backup consistency

• Eliminate risk of in-flight data corruption

• Simple and predictable backup process

Cons:

• Longest downtime among all modes

• Service interruption during full backup window

• Not suitable for production or always-on services

In general, Snapshot mode offers the best balance between speed and availability, while Stop mode prioritizes consistency over performance.

Which Proxmox Backup Mode Should I Choose?

The best Proxmox backup mode depends on your workload, storage type, and acceptable downtime. Snapshot mode is recommended if your storage supports it, as it provides fast backups with little or no downtime. Use Suspend mode when snapshot functionality is not available but consistent backups are still required. Finally, use Stop mode when data consistency is critical or during maintenance windows, as it fully shuts down the VM, ensuring the highest level of consistency but resulting in the longest downtime.

All in all, choose the mode based on your environment requirements to ensure a balance between performance, availability, and data safety.

How to Configure Proxmox Backup Modes?

Proxmox backup modes can be configured when creating or editing a backup job. You can choose the appropriate mode based on your environment requirements. Below, we list the step-by-step guide:

Method 1: Using GUI

1. In the Proxmox VE web interface, navigate to Datacenter > Backup > Add/Edit Backup Job.

2. Under the backup options, you will find the Mode setting, where you can select one of the three options: Snapshot, Suspend, or Stop.

3. After selecting the desired mode, configure the storage, schedule, and retention policy, then save the job to apply the settings.

Method 2: Using CLI

You can also configure backup mode using the command line by editing or creating a backup job via vzdump.

Example command:

vzdump <vmid> --mode snapshot

Other available options include:

--mode suspend
--mode stop

This allows you to control the backup process directly when running or scheduling backups via scripts or automation tools.

Flexible Enterprise Backup Solution with Vinchin Backup & Recovery

While Proxmox VE provides three built-in backup modes, its native backup features are designed for basic VM protection and may not be sufficient for complex enterprise environments. For organizations that require more flexible backup strategies and simplified management, Vinchin Backup & Recovery is a practical alternative.

Vinchin supports full, incremental, and differential backups, along with snapshot-based technology to ensure consistent and efficient backups with minimal downtime. It also supports hot/live backups, allowing VMs to remain online throughout the backup process. In addition, its unified web console makes it easy to configure backup policies, automate backup jobs, and centrally manage multiple Proxmox environments.

Here you can see how to back up a Proxmox VM in Vinchin:

1. Navigate to Backup > Virtualization, expand the VM list, and select the Proxmox host as the backup source.

2. Specify the backup destination by choosing the target backup storage and node.

3. Customize the backup strategies, choose either to run the task now or schedule it daily, weekly, or monthly, combined with full, incremental, or differential backup modes.

4. Review the options you have chosen, and click Submit to start the backup task.

Vinchin Backup & Recovery is a professional backup solution designed to deliver disaster recovery strategies for both small businesses and large enterprises. Click the Download button below to start a 60-day free trial with full features unlocked.

Proxmox Backup Modes FAQs

Q1: Which backup mode is best in Proxmox?

Snapshot mode is the recommended choice because it creates backups with little or no downtime. If snapshot is unavailable, Suspend is a good alternative, while Stop is best for maintenance windows or non-critical VMs.

Q2: Does Snapshot backup require compatible storage?

Yes. Snapshot mode requires storage that supports snapshots, such as ZFS, LVM-thin, or Ceph. For better application consistency, installing the QEMU Guest Agent is also recommended.

Q3: Can I change the backup mode for an existing backup job?

Yes. You can edit an existing backup job in the Proxmox web interface or update the vzdump command to use a different backup mode.

Q4: Does backup mode affect restore speed?

No, regardless of the selected backup mode, the VM recovery process in Proxmox remains the same. Backup mode only affects how the backup is created, not how it’s restored.

Final Thoughts

Choosing the right Proxmox backup mode depends on your workload, storage, and downtime requirements. While Snapshot, Suspend, and Stop each have their own advantages, Vinchin Backup & Recovery provides a more flexible, automated, and enterprise-ready solution to simplify Proxmox VM protection.

Pre-Checks Before Changing VM Disk Size

Before you start, make sure the following prerequisites are completed.

• Create a full VM backup or snapshot to prevent data loss in case of unexpected failures.

• Check the current disk format (is qcow2, raw, or LVM-thin), as resizing behaviour depends on storage type.

• Decide VM power state: shut down the VM for safest operation, or confirm if online resize is supported.

• Verify filesystem type inside the VM (ext4, xfs, NTFS), since each requires different resizing tools after disk changes.

• Confirm storage performance and stability, especially in production environments, to avoid interruption during resize operations.

How to Expand VM Disk Size in Proxmox VE?

Expanding Proxmox VM disk size is a common and relatively safe operation when additional storage is required. Complete it through the web interface or the command line, then extend the guest OS so it can use the new space.

Method 1: Using the GUI

The easiest way to increase disk size is via the Proxmox web interface:

1. Navigate to Datacenter > Node > VM > Hardware

2. Select the target virtual hard disk

3. Click “Resize disk”

4. Enter the additional size (e.g., +20GB)

5. Confirm and apply changes

Once completed, Proxmox will immediately extend the virtual disk at the hypervisor level. This method is recommended for most users due to its simplicity and reduced risk of syntax errors.

Method 2: via CLI

For advanced users or automation scenarios, the command line method provides more flexibility:

qm resize <vmid> scsi0 +20G

Parameters explained:

• <vmid> is the ID of the target virtual machine.

• scsi0 is the virtual disk to resize (replace it with the appropriate disk identifier if necessary).

• +20G specifies the amount of storage to add.

After execution, you can verify the updated disk size in the Proxmox GUI or by using disk inspection tools inside the VM.

Method 3: Extend Disk Size Inside Guest OS

After expanding the virtual disk, extend the operating system so it can recognize the new space.

Linux (ext4 / xfs):

Use growpart to expand the partition

• For ext4 filesystems:

resize2fs /dev/sda1

• For XFS filesystems:

xfs_growfs /

Windows:

1. Search “Computer Management” in the settings, and choose “Run as administrator”;

2. Open Disk Management and locate the expanded volume;

3. Right-click and choose Extend Volume.

Key Notes: Expanding a disk in Proxmox only increases the virtual disk size. To make the additional space usable, you must extend the partition and filesystem inside the guest OS. For production environments, resizing while the VM is powered off is recommended, and the result should always be verified after completion.

How to Shrink Proxmox VM Disk Size?

Important Warning: Shrinking a VM disk size in Proxmox is officially not supported in-place like expansion. The process is risky because it can lead to data loss or filesystem corruption, and even the virtual machine may fail to boot if not done correctly. To safeguard this operation, you need to:

• take a full backup or snapshot before proceeding

• Verify free space inside the guest OS

• Prefer cloning or migration instead of shrinking when possible

Recommended Safe Method

The safest approach is to create a new smaller disk and migrate data instead of directly shrinking:

1. Create a new smaller virtual disk in Proxmox;

2. Attach it to the VM as a secondary disk;

3. Boot into the guest OS;

4. Use tools like rsync, robocopy, or disk cloning utilities to transfer data;

Linux guest:

# Mount source(old) & target(new) disk partitions
mkdir /mnt/old /mnt/new
mount /dev/vda1 /mnt/old
mount /dev/vdb1 /mnt/new
# Full system sync (exclude virtual system dirs)
rsync -aAXv --progress --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/lost+found"} /mnt/old/ /mnt/new/

Windows guest:

robocopy D:\ E:\ /MIR /Z /R:5 /W:10 /NP

5. Update /etc/fstab or boot configuration if needed;

6. Remove the old large disk after confirming everything works.

This method avoids filesystem-level risk and is the preferred production approach.

Common Issues & Troubleshooting

After resizing a VM disk, the virtual disk and guest OS may not stay in sync. Here are the most common issues and their fixes.

1. Disk Resized but OS Not Showing Space

Fix: The virtual disk has grown, but the partition or filesystem has not. Extend the partition and filesystem inside the guest OS.

2. Filesystem Cannot Expand

Fix: The partition may not have been resized, or the filesystem requires a specific expansion tool. Resize the partition first, then expand the filesystem.

3. LVM Not Detecting New Space

Fix: LVM does not automatically recognize additional capacity. Run pvresize, then extend the logical volume and filesystem.

4. VM Not Booting After Disk Change

Fix: Incorrect boot settings or disk changes may prevent startup. Check the boot order and repair the bootloader if necessary.

5. Permission or Storage Mismatch

Fix: The storage backend may not support resizing, or your account lacks sufficient permissions. Verify storage compatibility and user privileges before retrying.

Back Up Critical Data Before Resizing Disk with Vinchin

Since both incorrect expansion and shrinking carry risks such as data loss and business disruption, it is essential to create a full backup of the VM disk before resizing to ensure data consistency and safety. Vinchin Backup & Recovery is dedicated to providing robust data protection and flexible backup strategies for small and large-scale enterprises.

Vinchin is compatible with over 15 virtualization platforms, including VMware, Proxmox, Hyper-V, XenServer, and OpenStack. It also supports automated and scheduled backups, helping to save significant time and effort. In addition, its built-in encryption, deduplication, and ransomware protection provide a strong security layer for backup data, ensuring immutability and maintaining data consistency.

With Vinchin’s intuitive web interface, it’s easy to back up Proxmox VM data:

1. Navigate to Backup > Virtualization, expand the host list, and checkmark the Proxmox host as the backup source.

2. Then, choose the target backup storage from local disks, NFS shares, or iSCSI block storage, and specify the target node as well.

3. Customize the backup strategies, set a time window to schedule the backup task or run it instantly, and also choose the backup plan (incremental, full, differential), retention policy, and other options.

4. Review all the settings you chose, and click Submit to initiate the current job.

Vinchin Backup & Recovery is a reliable backup solution with strong data protection capabilities. Click the Download button below to start a 60-day full-featured free trial and enhance the protection of your business data.

Proxmox Change Size of VM Disk FAQs

Q1: Can I resize a Proxmox VM disk without shutting down the VM?

Yes. Proxmox supports online disk expansion for many storage backends and guest operating systems. However, the guest OS must still extend its partition and filesystem before the new space becomes usable. For production workloads, shutting down the VM first is generally safer.

Q2: Which storage types support disk resizing in Proxmox?

Most commonly used storage backends, including LVM-Thin, ZFS, QCOW2, and RAW images on Directory Storage, support disk expansion. Available features may vary depending on the storage type and configuration.

Q3: Does resizing a VM disk delete data?

No. Expanding a virtual disk does not normally affect existing data. However, resizing partitions or shrinking disks always carries some risk, so creating a backup before making changes is strongly recommended.

Q4: How can I verify that the disk resize was successful?

After resizing, verify both the virtual disk and the guest OS. On Linux, you can use commands such as lsblk, fdisk -l, and df -h. On Windows, check the updated capacity in Disk Management.

Closing Words

Changing a Proxmox VM disk size is a routine task, but it should always be performed carefully. Disk expansion is usually quick and straightforward, whereas disk shrinking involves additional manual steps and carries a higher risk of data loss. Creating a full VM backup before resizing is the best practice. With Vinchin Backup & Recovery, you can protect your VMs with automated backups and restore them quickly if anything goes wrong, ensuring a safer and more reliable disk resizing process.

A storage snapshot is a point-in-time representation of a volume, file system, LUN, or dataset.

Unlike a full copy, most modern snapshots use:

• Copy-on-Write (CoW)

• Redirect-on-Write (RoW)

Technologies to record only changed blocks, making snapshot creation nearly instantaneous and highly space-efficient.

Typical use cases include: software upgrades, configuration changes, database maintenance, VM patching, and short-term rollback protection.

What Does Backup from Storage Snapshots Mean

Traditional backup workflows often read data directly from production storage.

Snapshot-based backup introduces an additional layer:

• Traditional Backup: Production Data > Backup Software > Backup Repository

• Snapshot-Based Backup: Production Data > Storage > Backup Software > Backup Repository

The backup application first triggers a storage snapshot.

Then, instead of reading active production data, it reads data from the snapshot and transfers it to a backup repository.

Backup from storage snapshots provides several advantages:

• Reduce impact on production workloads

• Faster backup windows

• Consistent recovery points

• Lower risk of backup-related performance bottlenecks

Snapshot vs. Backup: A Practical Distinction

To avoid confusion between snapshots and backups, the core technical differences are laid out below.

Practical Use Case Breakdown:

• Snapshots: Ideal for short-term recovery (accidental deletions, broken app upgrades, configuration mistakes within hours). Fast granular rollback, but tied to the original storage's health.

• Backups: Designed for catastrophic failures: hardware breakdown, ransomware encryption, full site loss, long-term compliance retention. Independent copies survive total loss of production infrastructure.

The Technical Workflow of Backup from Storage Snapshots

The typical workflow of backup from storage snapshots consists of several stages that allow backup software to protect data without directly impacting production workloads.

1. Prepare Application Consistency

Before creating a snapshot, the backup solution may coordinate with applications to ensure data consistency.

This prevents corruption caused by in-flight transactions.

2. Create the Storage Snapshot

The storage array generates a point-in-time snapshot of the volume, datastore, or file system.

Since only metadata and changed blocks are tracked, creation usually takes seconds regardless of data size.

3. Backup Software Reads the Snapshot

Instead of accessing live production data, the backup application reads from the snapshot copy.

4. Transfer Data to Backup Storage

The backup software copies data from the snapshot to a dedicated backup repository.

This step converts a temporary snapshot into a true backup copy.

5. Manage Retention and Deduplication

The backup platform applies: retention policies, compression, deduplication, encryption, immutability

6. Recovery Operations

When data loss occurs, administrators can restore from:

Recent issue

Restore directly from the storage snapshot for very fast recovery.

Major failure or ransomware

Restore from the backup repository, which is independent of the production storage.

Best Practices for Backup from Storage Snapshots

Follow these best practices:
1. Use snapshots for short-term recovery

Ideal snapshot scenarios include:

• Failed upgrades

• Application patches

• Configuration rollbacks

• Accidental changes

2. Export snapshot to independent backup storage

Snapshots become much more valuable when copied to:

• Backup repositories

• Secondary storage

• Cloud object storage

• Disaster recovery sites

This transforms a temporary restore point into a genuine backup asset.

3. Test recovery regularly

A backup is only useful if it can be restored.

Organizations should periodically validate:

• File-level recovery

• VM recovery

• Database recovery

• Full disaster recovery procedures

Vinchin Backup & Recovery Handles Snapshot-Based Protection

Storage snapshots provide a fast and efficient way to capture point-in-time copies of data, but they are only part of a complete data protection strategy. While snapshots excel at short-term rollback and rapid recovery, they typically reside on the same production infrastructure and may not provide sufficient protection against hardware failures, site outages, or ransomware attacks.

Vinchin Backup & Recovery complements snapshot-based protection by creating independent backup copies that can be retained, managed, and restored when snapshots are no longer available. During backup operations, Vinchin leverages hypervisor snapshot technologies to capture consistent recovery points with minimal impact on running workloads. The backup data is then transferred to a dedicated backup repository, ensuring long-term protection beyond the limitations of snapshots.

Steps to protect your environment with Vinchin, take VMware as an example:

Step 1. Choose the VMware VMs you want to protect as the backup source, under Backup > Virtualization

Step 2. Choose the desired backup destination

Step 3. Set your backup strategies, like mode, schedule, and retention policy

Step 4. Make sure the backup settings are all right, and click Submit

By combining rapid snapshot creation with independent backup storage, Vinchin helps organizations achieve both fast operational recovery and reliable long-term data protection, supporting modern business continuity and disaster recovery requirements. Download Vinchin now to get the 60-day free trial!

FAQs

Q1. Can storage snapshots replace backups?

No, storage snapshots provide fast point-in-time recovery but generally reside on the same storage system as production data. They do not offer the same level of protection as independent backups.

Q2. Can storage snapshots protect against ransomware?

Not reliably on their own. Attackers with storage admin access will delete or encrypt all local snapshots. Full ransomware protection requires immutable, physically/logically separated backup storage (WORM/object lock) that threat actors cannot alter or erase. Snapshots serve as a fast short-term recovery, and immutable backups are the last line of defense against full environment compromise.

Q3: Why do enterprises use snapshots before backups?

Snapshots allow backup software to read stable point-in-time data while reducing the impact on production applications and storage systems.

Conclusion

Storage snapshots enable fast recovery and efficient backups, but they cannot replace independent backups. By combining snapshot-assisted backup with secure backup repositories, Vinchin Backup & Recovery helps organizations achieve reliable data protection, ransomware resilience, and disaster recovery.

OVF (Open Virtualization Format) is an industry-standard packaging format developed by the Distributed Management Task Force (DMTF).

An OVF package typically contains:

• Virtual machine configuration files

• Virtual disk references

• Hardware requirements

• Deployment metadata

• Network configuration information

Detailed Steps to Migrate OVF to Proxmox

Below are the most practical and commonly used methods with detailed steps to import OVF to Proxmox.

Prerequisites Checklist

Complete these preparation steps to avoid hours of troubleshooting:
1. Check Proxmox version: Run pveversion on the host. GUI import requires v8.3 or newer; old versions rely solely on CLI.

2. Confirm sufficient storage space: The temporary staging folder needs free space equal to the full size of your virtual disks. Check storage with pvesm status.

3. Install requires tools: qeum-img comes preinstalled. For GUI OVA uploads run apt update && apt install unzip -y.

4. Record the source VM’s firmware: Note if the original VM uses SeaBIOS (legacy BIOS) or UEFI to match boot settings in Proxmox.

5. Back up or snapshot the source VM: Create a restore point before exporting to avoid permanent data loss.

Method 1. GUI Import (Easiest)

Proxmox 8.3 added native one-click OVA/OVF import to the web interface, designed for users unfamiliar with command lines.

Important Warning

This feature is exclusive to Proxmox VE 8.3 and above. All earlier versions must use the CLI workflow.

1. Log in to the Proxmox web console and open Datacenter > Storage from the left menu. 

2. Double-click a file-based storage pool. In the Content dropdown, tick the Import box and save changes. 

3. Navigate to your enabled storage pool and open the new Import tab. Upload an OVA file from your local computer or paste a remote download URL. 

4. Once the file upload finishes, select the OVA/OVF file and click Import to launch the setup wizard. The tool auto-reads hardware specs and generates a new VM.

5. Review and adjust critical settings: CPU cores, memory allocation, boot priority, network bridge, and BIOS/UEFI firmware before powering on the VM.

Method 2. qm importovf CLI Command (Recommended for Production)

The qm importovf utility is Proxmox’s long-standing, most reliable migration tool for production environments. It parses OVF definitions, creates VM configs, and converts disk images in one unified command, with better resilience for large virtual disks and unstable network transfers than the GUI importer.

1. Transfer OVF/OVA Files to Proxmox

Copy via SCP from the source hypervisor:

scp myvm.ova root@proxmox-host:/tmp/

Direct export from VMware ESXi with ovftool:

./ovftool vi://root@<esxi-ip>/<vm-name> /tmp/export/

2. Extract OVA Archives

OVA files are compressed TAR packages; extract to retrieve the .ovf descriptor:

cd /tmp tar xvf myvm.ova # Extracted output files: myvm.ovf, myvm-disk1.vmdk, myvm.mf

3. Run Dry-Run Validation (Mandatory Best Practice)

Test the import workflow without modifying storage or creating VMs to catch missing disks, invalid configs, or manifest errors:

qm importovf 101 /tmp/myvm.ovf local-lvm --dryrun

4. Execute Full Import

Select an unused VMID, target storage pool, and disk format:

# File storage (qcow2 with snapshot support) qm importovf 101 /tmp/myvm.ovf local-lvm --format qcow2 # Block storage (ZFS/LVM raw disks) qm importovf 101 /tmp/myvm.ovf local-zfs

5. Post-Import Hardware Optimization

Adjust CPU and storage controllers for maximum performance:

qm set 101 --cpu x86-64-v2-AES --scsihw virtio-scsi-single

For Windows VMs: Temporarily switch disks bus to IDE/SATA to boot, install VirtIO drivers, then revert to VirtIO SCSI.

Method 3. Manual Disk Conversion with qeum-img

Use this fully manual workflow when qm importovf fails to read corrupted/malformed OVF files, or you require complete custom control over disk placement and VM hardware. This method also handles multi-disk VMs and VMware-proprietary OVF extensions more consistently.

1. Extract OVA and inspect source disk details

tar xvf myvm.ova qemu-img info myvm-disk1.vmdk

This command shows total disk size, actual used space, and source format for storage planning.

2. Convert VMDK VMware disks to Proxmox-compatible qcow2/raw format

# -p flag displays live conversion progress bar
qemu-img convert -p -f vmdk myvm-disk1.vmdk -O qcow2 myvm-disk1.qcow2

3. Create an empty VM shell matching the source hardware specifications

qm create 102 \
--name myimportedvm \
--memory 4096 \
--cores 2 \
--net0 virtio,bridge=vmbr0 \
--scsihw virtio-scsi-single \
--ostype l26

Use win10/win2022 for Windows guest operating systems with the --ostype flag.

4. Import converted disk files to Proxmox storage

qm importdisk 102 myvm-disk1.qcow2 local-lvm

This adds an unattached “unused disk” entry to the VM; repeat for additional disks.

5. Attach disks and configure boot priority

# Attach primary disk with discard optimization
qm set 102 --scsi0 local-lvm:vm-102-disk-0,discard=on
# Set boot sequence
qm set 102 --boot order=scsi0
# Add UEFI EFI disk if source VM uses UEFI firmware
qm set 102 --bios ovmf --efidisk0 local-lvm:1

6. Power on the VM and verify boot functionality

qm start 102

Open the Proxmox console to observe boot behavior and resolve any launch errors.

Efficient Tool: Simplify Migration and Protect Proxmox VM

Manual OVF imports work well for small environments, but enterprises often require bulk VM migration, cross-hypervisor migration, backup before migration, and minimal downtime. That's where Vinchin Backup & Recovery becomes valuable.

Backup is critical before any changes. With Vinchin, it can provide backup solution, and also provide migration solution between supported platforms. In addition to enabling seamless migration, it can protect data before and after the migration through backups.

The following shows you how to protect your Proxmox environment:
Step 1. Select Proxmox VM as the backup source under Backup > Virtualization

Step 2. Choose the desired backup destination

Step 3. Then configure the backup strategies: schedule, mode, and retention policy

Step 4. Review and confirm your settings, and click Submit

Start a 60-day fully functional trial of Vinchin Backup & Recovery with no credit card required.

FAQs about OVF to Proxmox

Q1: What disk format should I choose for OVF imports to Proxmox?

qcow2: Preferred for file-based storage (supports snapshots, thin provisioning space savings)

raw: For high-performance block storage (LVM/ZFS), no snapshot functionality

vmdk: Only for temporary compatibility testing; avoid for production workloads

Q2: What's the difference between OVF and OVA?

OVF is a collection of files describing a virtual appliance, while OVA is a single archive containing the OVF descriptor and associated virtual disks.

Q3: Why does my imported VM not boot?

Common causes include BIOS mismatches, storage controller differences, missing drivers, or incorrect boot device configurations.

Conclusion

Migrating OVF to Proxmox VE can be straightforward when using the right method and proper preparation. Whether you choose GUI import, qm importovf, or manual disk conversion, validating VM settings after migration is essential. For larger environments, Vinchin Backup & Recovery helps streamline migration while providing reliable backup and recovery protection.

"I have two ESXi 5.5 hosts managed by vCenter. Suddenly, all VMs became orphaned, and I saw ‘Cannot synchronize host’. Reconnect fails with vpxa error, but VMs still run on hosts."

This issue is typically caused by broken communication between vCenter and ESXi management agents, often due to network, DNS, certificate, or service failures. This article will explore the causes and practical solutions to restore host synchronization.

Why VMware Cannot Synchronize Host?

The “VMware cannot synchronize host” error usually indicates that vCenter Server has lost reliable communication with the ESXi host management layer, rather than an actual VM failure. As a result, vCenter cannot update inventory data, which leads to orphaned VMs, host disconnection, or synchronization failures.

This problem is typically caused by issues in one or more of the following areas:

1. ESXi management services failure (hostd / vpxa)

The host relies on hostd and vpxa services to communicate with vCenter. If either service hangs, crashes, or fails to start properly, vCenter cannot complete synchronization.

2. Network connectivity issues

Intermittent or broken connectivity between vCenter and ESXi can prevent proper host communication. Common causes include:

• Firewall blocking required ports (e.g., 443, 902)

• Packet loss or unstable links

• Incorrect VLAN or routing configuration

3. DNS or name resolution problems

vCenter depends heavily on correct forward and reverse DNS resolution. If the ESXi hostname cannot be resolved consistently, synchronization may fail.

4. Time synchronization mismatch

Large time drift between ESXi hosts and vCenter can break authentication and certificate validation, preventing successful host sync.

5. Certificate or authentication issues

Expired or mismatched SSL certificates can block secure communication between vCenter and ESXi hosts.

6. Version or compatibility issues

Older environments or mixed-version upgrades (e.g., legacy vSphere 5.x setups) may trigger synchronization problems due to API or service incompatibilities.

In most cases, the issue is not caused by a single factor, but a combination of management service instability and communication breakdown between vCenter and ESXi hosts. The next section will cover practical troubleshooting steps to resolve these problems.

How to Fix “VMware Cannot Synchronize Host”?

Once the root cause is understood, the issue can usually be resolved by restoring communication between vCenter Server and the ESXi host management services. Below are practical troubleshooting steps, starting from the simplest checks.

1. Verify Network Connectivity

Ensure vCenter can reach the ESXi host without interruption:

• Test basic connectivity (ping)

ping esxi01.lab.local
nc -zv esxi01.lab.local 443 902
nslookup esxi01.lab.local
nslookup 192.168.1.20

• Verify DNS resolution (forward and reverse lookup)

• Confirm required ports are open (especially 443 and 902)

2. Check and Restart ESXi Management Services

A common cause is a stuck or failed host management agent (hostd/vpxa).

SSH into the ESXi host and restart services:

/etc/init.d/hostd restart
/etc/init.d/vpxa restart

Or:

services.sh restart

3. Restart vCenter Services

If multiple hosts are affected, the issue may be on the vCenter side. Restarting vCenter services (vpxd, etc.) can restore synchronization.

Execute vCenter Appliance SSH:

service-control --stop --all
service-control --start --all

4. Reconnect the ESXi Host in vCenter

• Disconnect the host from vCenter

• Reconnect it using the correct credentials

• If needed, remove and re-add the host completely

5. Fix DNS and Time Synchronization

Incorrect DNS configuration or time drift between vCenter and ESXi hosts is a common cause of host synchronization failures.

NTP time sync configuration path: Host > Configure > System > Time Configuration > Edit

Ensure:

• ESXi hosts and vCenter Server are synchronized using the same NTP servers

• Time drift is within an acceptable range to avoid authentication or certificate issues

DNS Configuration:
Verify that:

• Forward and reverse DNS resolution are correctly configured

• The hostnames of ESXi and vCenter can be resolved consistently in both directions

6. Check Certificates

Expired or mismatched certificates can block host communication. Regenerate or renew ESXi certificates if necessary.

7. Upgrade or Patch VMware Components

In older environments, especially legacy versions like vSphere 5.x, upgrading ESXi or vCenter can resolve known synchronization bugs and compatibility issues.

Best Practices to Prevent “VMware Failed to Synchronize Host” Issue

Most host synchronization issues can be avoided by maintaining a stable and consistent VMware infrastructure. Below, we summarize some best practices to prevent such issues.

• Ensure correct DNS configuration

Make sure forward and reverse DNS records are properly configured and consistent across vCenter and ESXi hosts.

• Use a reliable NTP time sync

Keep ESXi hosts and vCenter synchronized with the same NTP sources to prevent authentication and certificate issues.

• Keep VMware components updated

Regularly patch ESXi and vCenter to avoid known bugs and compatibility problems.

• Maintain management service health

Monitor and ensure hostd and vpxa services are running normally on ESXi hosts.

• Stabilize network connectivity

Ensure low-latency, reliable network paths between vCenter and hosts, with required ports open.

• Manage certificates properly

Track certificate expiration and renew them in advance to avoid communication failures.

Protect VMware VMs with Vinchin Backup & Recovery

Some synchronization issues require restarting management services, reconnecting hosts, or even removing and re-adding ESXi hosts. Although these operations are generally safe, unexpected failures may still affect VM availability. Creating a recent backup before troubleshooting provides an additional layer of protection.

Vinchin Backup & Recovery offers reliable backup, restore, and migration services to protect your virtual machines from data loss, failures, or unexpected disruption. It supports over 15 virtualization platforms (VMware, Proxmox, Hyper-V, etc.) and enables the data consistency via built-in encryption, deduplication, and ransomware protection. 

Its core features include:

• Agentless backup: Simple deployment with no need for complex agent installation or configuration.

• Incremental backup: Captures only changed data to ensure backups stay up to date while reducing storage usage and backup time.

• Instant recovery: Achieves near-zero RTO and RPO, enabling rapid VM recovery and minimal business disruption.

• Cross-host migration: Seamlessly move virtual machines across different hosts or clusters for flexible workload management.

Vinchin Backup & Recovery is a trustworthy backup vendor and offers a 60-day free trial; click the Download button to get advanced features unlocked.

VMware Cannot Synchronize Host FAQs

Q1: What does “VMware cannot contact host” mean?

It means vCenter Server is unable to communicate properly with the ESXi host, usually due to network issues, failed management services, or configuration problems, while VMs may still be running normally on the host.

Q2: Can VMs still run when the host cannot synchronize?

Yes. In most cases, VMs continue running normally on the ESXi host. The issue is only between vCenter and the host management layer.

Q3: Does restarting ESXi management services affect running VMs?

Restarting hostd or vpxa does not stop running VMs, but it may temporarily disconnect the host from vCenter until services recover.

Q4: Will removing a host from vCenter delete VMs?

No, removing a host from vCenter will not delete the VMs. The virtual machines remain stored on the ESXi datastore and continue running normally on the host. Only the vCenter management connection is removed.

Closing Thoughts

The “VMware failed to synchronize host” issue typically occurs when vCenter loses communication with the ESXi host due to network, DNS, or management service (hostd/vpxa) failures. In this post, we discussed the common causes and provided practical fixes. We also shared best practices to help prevent similar issues. For a more stable and secure production environment, it is recommended to regularly back up critical business data using Vinchin Backup & Recovery.

Proxmox VE supports multiple storage types for saving virtual machine backups. The right option depends on your environment, storage capacity, performance requirements, and recovery objectives. Below is a comparison table of the common backup storage types.

Prerequisites Before Adding Backup Storage

Before adding backup storage in Proxmox VE, make sure your environment is properly prepared. The following checks can help ensure the storage is added successfully and backup jobs run without issues.

• Prepare the Backup Storage

Choose a storage type that fits your environment, such as a local directory, NFS share, SMB/CIFS share, or Proxmox Backup Server (PBS). Ensure the storage has enough free space for your backup data.

• Verify Network Connectivity

For NFS, SMB/CIFS, or PBS, confirm that the Proxmox host can reach the storage server over the network. A stable connection helps prevent backup failures and slow transfer speeds.

• Configure Access Permissions

Make sure Proxmox has the required permissions to access the storage. Depending on the storage type, this may involve configuring NFS exports, SMB credentials, or PBS authentication.

• Plan Backup Capacity

Estimate your storage needs based on the number of VMs, backup frequency, and retention policy. Reserving sufficient space helps avoid backup interruptions caused by a full storage device.

How to Add Backup Storage in Proxmox VE?

Proxmox VE allows you to add different types of backup storage through the web interface. The configuration steps vary slightly depending on the storage type, but the general workflow is similar.

Method 1: Add Directory Storage (Local Path)

A directory storage saves backups to a local file system or a mounted disk on the Proxmox host.

Steps:

1. Log in to the Proxmox VE web interface.

2. Navigate to Datacenter > Storage.

3. Click Add and select Directory.

4. Specify the directory path and assign a storage ID.

5. Under Content, select VZDump backup file.

6. Click Add to save the configuration.

Method 2: Add NFS Storage as a Backup Target

NFS storage enables Proxmox to save backups to a remote NAS or Linux server.

Steps:

1. Go to Datacenter > Storage > Add > NFS.

2. Enter the NFS server IP address or host name.

3. Select the exported NFS share.

4. Specify a storage ID.

5. Enable VZDump backup file under Content.

6. Click Add to mount the storage.

Method 3: Add SMB/CIFS Storage

SMB/CIFS storage is commonly used when backups are stored on a Windows file server or a NAS that supports the SMB protocol.

Steps:

1. Navigate to Datacenter > Storage > Add > SMB/CIFS.

2. Enter the server address and share name.

3. Provide the required username and password.

4. Specify a storage ID.

5. Select VZDump backup file as the content type.

6. Click Add to complete the configuration.

Method 4: Add Proxmox Backup Server (PBS)

PBS is Proxmox's dedicated backup solution and provides incremental backups, deduplication, and faster restore performance.

Steps:

1. Open Datacenter > Storage > Add > Proxmox Backup Server.

2. Enter the PBS server address.

3. Configure the datastore, username, and authentication information.

4. Specify a storage ID.

5. Test the connection to ensure the server is reachable.

6. Click Add to finish the setup.

How to Verify Proxmox Backup Storage?

After adding backup storage in Proxmox VE, it is important to verify that it’s correctly recognized and fully functional before running production backups, ensuring backup tasks run smoothly without failure or data loss.

1. Check Storage Availability

Go to Datacenter > Storage and confirm the storage is listed and marked as Active. If missing or abnormal, recheck the configuration, such as the NFS path, iSCSI target, or PBS connection.

2. Validate Storage Type and Access

Ensure the storage type is correct and accessible:

• NFS/SMB: verify mount status and read/write permissions

• iSCSI/FC: confirm LUN mapping and node visibility

• PBS: check repository connection and credentials

3. Run a Test Backup

Use a non-critical VM to run a manual backup:

• Start backup job

• Check task log for errors

• Confirm backup is successfully created

4. Verify Backup Output

Check the target storage to ensure:

• Backup files are generated and readable

• File size is reasonable

• Incremental backups work if enabled

Effortlessly Add Proxmox Backup Storage with Vinchin

Vinchin Backup & Recovery enables fast integration of diverse storage environments without complex configuration, helping IT teams quickly extend backup capacity, improve resource utilization, and adapt to growing workloads with a unified management console. It supports over 15 virtualization platforms, including Proxmox, Hyper-V, and VMware, while ensuring data integrity with strong encryption and built-in ransomware protection.

To add Proxmox backup storage, just follow these steps:

1. Navigate to Resources > Storage, and choose to create a new backup storage.

2. Then, select from the expanded storage resource types, including local disks, SAN storage (iSCSI, FC), NAS storage (NFS, SMB/CIFS), etc.

Next, you can create a new backup job to store the data in the target storage destination.

1. Go to Backup > Virtualization, and select the Proxmox host as the backup source.

2. Then, choose a target storage device from the storage types you added, and select the target node as well.

3. Customize the backup strategies. Either run the task immediately or schedule it daily/weekly/monthly, combined with incremental or full backup plans.

4. Finally, review all the backup settings, and click Submit to run this job.

Vinchin Backup & Recovery is trusted by customers in over 200 countries and regions, and it has won a reputation worldwide for its robust data protection strategies. Click the Download button below to experience a 60-day free trial with full features.

Proxmox Add Backup Storage FAQs

Q1: Why is my Proxmox backup storage not working after adding it?
This is usually caused by incorrect configuration, network issues, permission errors, or unsupported storage parameters. Always check the logs under the backup task details.

Q2: What is the best storage type for Proxmox backups?
It depends on the use case. PBS is recommended for deduplication and incremental backups, while NFS and SAN are commonly used for performance and shared environments.

Q3: Can I use multiple backup storage in Proxmox VE?
Yes, Proxmox allows multiple backup storage targets, enabling flexible backup strategies and improved data redundancy.

Conclusion

Proxmox VE offers four common storage types: directory storage, NFS share, SMB/CIFS, and Proxmox Backup Server (PBS) to store backup data. You can choose the most suitable option based on your production environment and storage capacity requirements.

After defining a Proxmox backup location, it is important to verify its availability and create a backup job to ensure critical data is securely protected. For a simpler and more flexible approach, Vinchin Backup & Recovery can further streamline this process by unifying multiple storage types and helping ensure reliable, centralized data protection.

Vinchin, a leading provider of enterprise backup and disaster recovery solutions, today announced a strategic partnership with TKBRIG, a specialized technology distribution company serving high-growth markets across the Asia-Pacific region. The collaboration aims to accelerate the adoption of modern data protection technologies while helping organizations strengthen cyber resilience in an increasingly complex digital landscape.

Headquartered in Sri Lanka with working offices in Singapore, TKBRIG is recognized for its knowledge-driven approach to technology distribution. Unlike traditional distributors, TKBRIG combines technical expertise, market intelligence, and coordinated channel execution to help partners and customers successfully deploy enterprise technologies. Its business focuses on four key areas: Cybersecurity, Data Governance & Compliance, Cloud & Infrastructure, and AI & Intelligent Systems—with Vinchin’s advanced backup and disaster recovery solutions anchoring the Cloud & Infrastructure portfolio to ensure robust enterprise business continuity and underlying data availability.

Through this partnership, Vinchin and TKBRIG will work together to deliver comprehensive data protection solutions to enterprises across the Asia-Pacific region. The collaboration will leverage TKBRIG’s extensive regional expertise and partner ecosystem alongside Vinchin’s proven backup and disaster recovery technologies, enabling organizations to better protect critical workloads, ensure business continuity, and address evolving cybersecurity challenges.

As ransomware attacks, regulatory requirements, and hybrid IT environments continue to grow in complexity, enterprises are seeking reliable and scalable solutions that can safeguard their most valuable digital assets. Vinchin’s Backup & Recovery platform provides comprehensive protection for virtual machines, physical servers, databases, cloud workloads, and enterprise applications, featuring capabilities such as immutable backup storage, instant recovery, centralized management, and high-availability deployment.

The partnership will also focus on channel enablement, technical training, solution workshops, and joint market development initiatives. By combining Vinchin’s innovation in data protection with TKBRIG’s deep understanding of regional market requirements, both companies aim to help partners deliver greater value to customers while accelerating digital transformation projects across the region.

“We are excited to partner with TKBRIG as we continue expanding our presence in the Asia-Pacific market,” said a spokesperson from Vinchin. “TKBRIG’s strong technical capabilities, partner-first mindset, and commitment to delivering knowledge-based technology solutions make them an ideal partner. Together, we will empower organizations with robust data protection and cyber resilience solutions that support long-term business growth.”

“Data protection and cyber resilience are no longer optional—they are the foundation of modern enterprise IT strategy,” said Livan Jayasekera, Founder / Director at TKBRIG. “By adding Vinchin’s robust backup and disaster recovery platform to our portfolio, we are equipping our channel partners with a highly scalable, enterprise-grade solution. This partnership perfectly aligns with our mission to deliver specialized, knowledge-driven technology that addresses complex digital risks across the APAC region.”

As organizations continue their digital transformation journeys, Vinchin and TKBRIG remain committed to helping enterprises build secure, resilient, and future-ready IT environments through innovative technologies, expert support, and strong partner collaboration.

About TKBRIG

TKBRIG is a specialized, knowledge-driven technology distribution company serving high-growth regions across the Asia-Pacific. Headquartered in Singapore with deep operational roots in Sri Lanka, the company positions itself not just as a traditional logistics distributor, but as a strategic, expert-backed partner for global vendor channels.

The company's core operational philosophy revolves around three pillars reflected in its name: Technology (curating a high-demand "arsenal" of market-ready solutions), Knowledge (providing technical intelligence and deployment expertise), and Brigade (operating as a highly coordinated, unified force alongside its channel partners).

• Cybersecurity: Delivering prevention-first architecture, automated security validation, threat intelligence, and privileged access management (PAM) 

• Data Governance & Compliance: Providing application-level data protection and AI-driven data tracking to align with strict global regulations 

• Cloud & Infrastructure: Fueling enterprise digital transformation through hybrid and multi-cloud solutions.

• AI & Intelligent Systems: Deploying secure, privacy-first Agentic AI frameworks for enterprise process automation.

Through its structured partner support methodology, TKBRIG guides partners / clients securely through discovery, solution design, and coordinated execution to ensure seamless solution deployment.

About Vinchin

Vinchin offers powerful, agentless data protection solutions for virtual environments, physical servers, NAS, and databases, serving tens of thousands of customers across more than 100 countries. Its flagship product, Vinchin Backup & Recovery, is compatible with a variety of platforms, including VMware, Hyper-V, XenServer/XCP-ng, RHV/oVirt, OpenStack, Sangfor HCI, as well as major databases like PostgreSQL, Microsoft SQL Server, MariaDB, and MySQL.

This error can appear after maintenance windows, vCenter upgrades or randomly during steady-state normal operation. And the core meaning: vCenter Server cannot reach or communicate with the ESXi host elected as the HA cluster's master FDM (Fault Domain Manager) agent.

Without an accessible master node, all vSphere HA functionality is disabled:

• VM will not automatically restart if their ESXi host fails

• No admission control calculations are processed for the cluster

This issue can affect both newly deployed clusters and long-running production environments.

Common Causes of vSphere HA Master Agent not Found

The following lists the common reasons for the error:

Corrupted or Unresponsive FDM Agent: The FDM agent is responsible for HA operations on each ESXi host. If the agent becomes corrupted, outdated, or stops responding, the HA master may no longer function correctly.

Missing HA Configuration Files: vSphere HA depends on several configuration files stored on each ESXi host. If critical files such as Fdm.cfg are deleted or become corrupted, the FDM service may fail to start.

Datastore Heartbeat Problems: In addition to the management, vSphere HA uses shared datastores for the heartbeat monitoring. If heartbeat datastores become inaccessible, HA may struggle to determine host available.

vCenter or ESXi Upgrade Inconsistencies: Many administrators encounter this error shortly after upgrading vCenter Server or ESXi hosts. In some cases, the upgrade environment requires the FDM agents to be redeployed before HA function normally.

Step-by-Step Methods to Solve Cannot Find vSphere HA Master Agent

If you have already met this error, follow the troubleshooting methods below, start with the simplest solutions.

Method 1. Reconfigure vSphere HA

Reconfiguring HA forces vCenter to redeploy the FDM agents and perform a new master election.

1. Log in to the vSphere Client

2. Navigate to Hosts and Cluster, select the affected cluster and right-click > Settings

3. Click Configure > vSphere Availability

4. Click Edit 

5. Disable vSphere HA and click OK

6. Wait until the HA configuration is removed from all hosts

7. Edit the settings again and re-enable vSphere HA

8. Monitor the Recent Tasks pane for successful completion

The Expected Result: A new HA master is elected and the alarm disappears.

Method 2. Verify Network Connectivity Between Hosts

HA relies on uninterrupted communication between ESXi hosts.

1. Open an SSH session to an ESXi host

2. Test connectivity to other hosts using:

vmkping <target-management-IP>

3. Verify DNS resolution:

nslookup <hostname>

4. Confirm all hosts can communicate over the management network

5. Check for:

• VLAN mismatches

• Firewall restrictions

• Incorrect gateways

• Packet loss

6. Correct any network issues found

7. Reconfigure HA if necessary

The Expected Result: Hosts can communicate normally and HA services resume.

Method 3. Restart ESXi Management Services

If HA agents become unresponsive, restarting management services can restore communication.

1. Enable SSH on the affected ESXi host

2. Connect via SSH

3. Run:

services.sh restart

4. Wait several minutes for services to restart

5. Return to vCenter and check HA status

Or you can:

1. Access the ESXi DCUI console

2. Press F2 and log in

3. Select Troubleshooting Options

4. Choose Restart Management Agents

The Expected Result: Hosts communication with vCenter and the HA master agent is restored.

Method 4. Disconnect and Reconnect the Host

This refreshes communication between the host and vCenter.

1. Open the vSphere Client

2. Right-click the affected ESXi host

3. Select Disconnect

4. Wait for the operation to complete

5. Right-click the host again

6. Select Connect

7. Allow vCenter to re-establish communication

8. Verify HA status

The Expected Result: The host successfully rejoins the cluster and HA becomes healthy.

Quick Preventive Steps to Avoid Recurrence

To avoid the Cannot Find vSphere HA Master Agent, follow these actions:

• Always disable vSphere HA before any vCenter upgrade

• Keep uniform DNS, MTU, VLAN & vSAN VMkernel configs across all cluster nodes

• Patch vCenter and ESXi hosts in lockstep (follow VMware interoperability matrix)

• Forward /var/log/fdm.log to centralized syslog to catch heartbeat errors early

Preventing VM Downtime Beyond HA

While VMware HA provides automated recovery during host failures, it is not a backup solution.

If HA configuration becomes corrupted, FDM agents fail, storage issues occur, or multiple hosts become unavailable, virtual machines remain vulnerable.

For this reason, many organizations deploy dedicated VM backup software alongside HA. Vinchin Backup & Recovery is such an efficient tool, providing agentless protection for VMware vSphere environments and can complement HA by ensuring recoverability when cluster-level services encounter issues.

Key capabilities include:

• VMware VM backup and recoevery

• Instant VM Recovery

• Cross-platform migration

• Incremental Forever Backup

• Backup verification

• Ransomware-resistant backup repositories

Simple steps to backup your VMware environments:
Step 1. Choose the VMware backup source under Backup > Virtualization tab

Step 2. Then choose your wanted backup destination (storage and node)

Step 3. Configure the backup strategies like backup schedule, throttling policy, and retention policy

Step 4. Review and configure your backup settings, click Submit to begin backup process

If a VM becomes unavailable due to cluster failures, administrators can rapidly restore workloads without relying solely on HA mechanisms.

For enterprises running business-critical VMware environments, combining HA with independent backup protection creates a more resilient disaster recovery strategy. Download and try Vinchin 60-day full-featured trail for free!

FAQs about Cannot Find vSphere HA Master Agent Error

Q1: Is the error dangerous?

Yes, while running VMs may continue operating normally, VMware HA may no longer be able to automatically restart workloads if a host fails. This reduces fault tolerance until the issue is resolved.

Q2: Can virtual machines continue running when the HA master agent cannot be found?

Yes, existing virtual machines typically continue running normally because the error affects HA management and failover capabilities rather than VM execution itself. However, if an ESXi host fails while the issue persists, HA may not be able to automatically restart affected VMs on other hosts.

Q3: Does the error affect vMotion or Storage vMotion operations?

Not directly, vMotion and Storage vMotion use separate VMware services and can often continue functioning even when HA reports a master agent issue. However, cluster-wide communication problems that trigger the HA error may also impact migration operations in some environments.

Conclusion

The Cannot Find vSphere HA Master Agent error can compromise VMware High Availability and increase the risk of VM downtime. By identifying the root cause and applying the appropriate fixes, administrators can quickly restore HA functionality. For comprehensive protection, combining VMware HA with a reliable backup solution like Vinchin Backup & Recovery ensures both availability and recoverability for critical virtual machines.