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Back Up VM in a Hyper-V Server Fails

Valid on all Windows operating systems.

Symptom

When performing an online backup for a Volume Shadow Copy Service (VSS), the VSS requires the mounting of snapshot VHDs to revert them back to their proper state. If automount is disabled, VSS cannot mount the snapshot VHDs as required.

To determine if automount is enabled, run DISKPART.EXE from a command prompt and then run the following command without quotes at the DISKPART prompt: "automount".

Backing up the virtual machine fails when the following error message appears in the Activity Log:

AE0603 RMDMISLARCRW009 11/05/2012 05:37:09 PM 2171 1 Failed to create VSS shadow copy for the VM on the Hyper-V host machine.

Solution

Run DISKPART.EXE from a command prompt and then run the following command without quotes at the DISKPART prompt:

"automount enable"

Ensure the “Microsoft Hyper-V VSS Writer” state is Stable and resubmit the job.

http://support.microsoft.com/kb/2004712