Discussions specific to the Microsoft Hyper-V hypervisor
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Joined: Jun 15, 2018 7:47 am
Full Name: AP_

Re: The infamous 'VSS_WS_FAILED_AT_PREPARE_SNAPSHOT' problem

Post by ap_ » Jun 15, 2018 8:00 am

Bennon Maina wrote:
Another way around this, although wouldn't recommend it on backups jobs for VMs with high I/O that are failing to create at preparing a snapshot/checkpoint; create one manually from Hyper-V Manager or SCVMM.
Once completed, delete the snapshot. All AVHDX files associated with the VMs will be merged but do check the storage location in case any are left. You should be able to delete them manually and run a backup job.

I haven't had a backup failure since.
Thanks for this information Bennon, very much appreciated! I couldn't find any orphaned AVHDX files (perhaps I was looking in the wrong place) but your solution of creating and deleting a checkpoint (followed by a restart) on the guest vm has fixed my issue.

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