Hyper-V role Windows Server 2019 Standard single VM doesn't backup

[vbtech]

Hello,

Trying to solve this one for myself, but not quite getting there. Customer system that’s running Windows Server 2019 Standard with Hyper-V role using the commercial Hyper-v client. It has 4 VMs on it, and oddly all are backing up except one. It tries to create the checkpoint, gets to 19% then dies. Below is the log message in the client, and the debug log output:

Starting unscheduled incremental image backup of volume “SCSI:0:0”…
Basing image backup on last full image backup
Loading ZIP metadata from urbackup/mbr_data_ADS-2012–SCSI_0_0.zip
GWHV19[ADS-2012]: Loading MBR zip file…
Error loading ZIP file MBR (1): Creating shadow copy failed. See client log file for details.
Time taken for backing up client GWHV19[ADS-2012]: 23s
Backup failed

You get the same message if it’s a full image backup.

Here’s the debug log:
2021-12-08 18:09:49: ERROR: Creating shadowcopy of “hyperv://ADS-2012/SCSI:0:0” failed.
2021-12-08 18:16:07: ERROR: Error creating Hyper-V snapshot of ADS-2012. Output: ProcessWMIJob : Exception of type ‘Microsoft.PowerShell.Commands.WriteErrorException’ was thrown.
At C:\Program Files\UrBackup\hyperv_snapshot.ps1:152 char:13

• ($job | ProcessWMIJob -WmiClass $Msvm_VirtualSystemSnapshotServic ...
  

•         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

  • CategoryInfo : NotSpecified: ( [Write-Error], WriteErrorException
  • FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,ProcessWMIJob

ScriptHalted
At C:\Program Files\UrBackup\hyperv_snapshot.ps1:32 char:14

•          Throw $Job.ErrorDescription
  

•          ~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

  • CategoryInfo : OperationStopped: ( [], RuntimeException
  • FullyQualifiedErrorId : ScriptHalted

2021-12-08 18:16:07: ERROR: Creating shadowcopy of “hyperv://ADS-2012/SCSI:0:0” failed.

Ps running vssadmin list writers does not show any errors

Appreciate any insight!

Thanks!

[uroni]

Googling only finds me this old thread:

Hyper-V VM Snapshot Issue

hi One of my windows 2016 hyper-v vms is not able to create the snapshot for the backup using the latest hyper-v client. When I run the urbackup hyperv_snapshot.ps1 powershell script from powershell cmd I get this output ProcessWMIJob : Exception of type 'Microsoft.PowerShell.Commands.WriteErrorException' was thrown. At C:\Program Files\UrBackup\hyperv_snapshot.ps1:151 char:13 + ($job | ProcessWMIJob -WmiClass $Msvm_VirtualSystemSnapshotServic ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~…

In this case I think the issue is VSS issues within the VM. Perhaps try to create a production snapshot from the UI to confirm it cannot create production snapshots. Then look at the event log within the VM.