Troubleshooting › Virtual Machine Backup and Restore Related › Agentless Host-based Backup for Hyper-V VM Fails after Upgrading Arcserve UDP

Agentless Host-based Backup for Hyper-V VM Fails after Upgrading Arcserve UDP

Valid for Hyper-V

Symptom

After upgrading Arcserve UDP from Version 5.0 Update 2 or before to the latest version, the agentless host-based backup has started failing with the following error message:

The backup job is cancelled. For a VSS snapshot, the Hyper-V VSS writer needs to save the virtual machine and this is not applied in the current plan. To restart the backup job, change the Hyper-V Snapshot Method setting in the plan. For details on how to set Hyper-V Snapshot Method in a plan, see the product documentation.

The agent-less host-based backup was working before the upgrade.

Solution

In Arcserve UDP Version 5.0 Update 2 or before, when the virtual does not support the online backup method, the default behavior is to adopt the offline backup method. The offline backup method saves the virtual machine while taking a snapshot. In the Saved state, the virtual machine is inaccessible. However, critical virtual machines need to be accessible all the time.

In Version 5.0 Update 3 and later versions, if the virtual machine needs to be placed into the Saved state, the default behavior is to cancel the backup job to avoid any downtime of the virtual machine. If you do not want the backup job to get cancelled, change the Hyper-V Snapshot Method option in the plan. For more details about the Hyper-V Snapshot Method option in the plan, see How to Create a Host-Based Virtual Machine Backup Plan.

You can also refer the Arcserve KB article for more details on this issue.