- Veeam Support Knowledge Base
- Backing Up Hyper-V Guest Cluster Based on VHD Set
Backing Up Hyper-V Guest Cluster Based on VHD Set
| KB ID: | 2709 |
| Product: | Veeam Backup & Replication |
| Published: | 2018-08-22 |
| Last Modified: | 2026-03-24 |
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Challenge
Cause
Please make sure the following requirements are met:
- Each guest VM should have the cluster feature installed.
- All members of the guest cluster should be online.
- VHD Set shouldn't be used as a Cluster Shared Volume (CSV)
- The CSV folder containing the VHD Set files should have sufficient permissions.
Note: See the instructions for configuring the missing permission in the Event 19100 section below. - The guest operating system should be Windows 2016 or later.
- All VHD Set files must reside on CSV or SMB shares.
- Microsoft supports legacy shared VHDX on Windows 2016, but this feature cannot be used as a workaround because it cannot be included in application-consistent checkpoints, therefore, Veeam doesn't support backup of such disks on Windows Server 2016 and later.
- If your VMs reside on a CSV, ensure the ConfigStoreRootPath cluster parameter is defined.
Otherwise, the backup job might fail during checkpoint creation due to one of the errors listed below.
Solution
Error code: 32768 - Failed to create checkpoint on collection 'Hyper-V Collection'
This issue occurs because Windows can't query the cluster service inside the guest VM. To fix this issue, ensure that the cluster feature is installed on all guest VMs and the cluster service is running.
Error code: 32770 - Active-active access is not supported for the shared VHDX in the VM group
This issue occurs because the VHDS disk is used as a Cluster Shared Volume (CSV), which cannot be used for creating checkpoints. To fix this issue, use each disk as a shared disk rather than a Cluster Shared Volume. You can do this by using the "Remove from Cluster Shared Volume" option in the cluster manager GUI.
Error code: 32775 - More than one VM claimed to be the owner of shared VHDX in VM group 'Hyper-V Collection'
This issue occurs because the shared drive was offline in the guest cluster. To fix this issue, make sure that all shared drives in the cluster that are part of the backup are online.
Error Event 19100 - Hyper-V-VMMS 19100 'BackupVM' background disk merge failed to complete: General access denied error (0x80070005)
This issue occurs because of a permission issue. To fix this issue, the folder containing the VHDS and snapshot files must be modified to grant the VMMS process additional permissions. To do this, follow these steps:
- Determine the GUIDS of all VMs that use the folder. To do this, start PowerShell as an administrator, and then run the following command:
get-vm | fl name, idExample output:
Name : BackupVM Id : d3599536-222a-4d6e-bb10-a6019c3f2b9b Name : BackupVM2 Id : a0af7903-94b4-4a2c-b3b3-16050d5f80f
- For each VM GUID, assign the VMMS process full control by running the following command:
icacls <Folder with VHDS> /grant "NT VIRTUAL MACHINE\<VM GUID>:(OI)F"Example commands:
icacls "c:\ClusterStorage\Volume1\SharedClusterDisk" /grant "NT VIRTUAL MACHINE\a0af7903-94b4-4a2c-b3b3-16050d5f80f2:(OI)F" icacls "c:\ClusterStorage\Volume1\SharedClusterDisk" /grant "NT VIRTUAL MACHINE\d3599536-222a-4d6e-bb10-a6019c3f2b9b:(OI)F"
- If the issue persists after the icacls permissions are corrected, place cluster nodes in different backup jobs.
More Information
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