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Source: Microsoft Support
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When you make a backup of a virtual machine in Hyper V with a hardware provider Hyper V VSS Writer will stop responding and you will receive an error similar to the following:
Event ID 12366
An unhandled exception was encounteres while processing a VSS writer event callback. the VSS writer infrastructure is in an unstable state. The writer hosting process must be restarted in order to resume VSS functionality.
Writer name: Microsoft Hyper-V VSS Writer Process command line: VMMS.EXE Exception code 0xE06D7363
In the VSS Trace log you would see the following entries:
Hardware providers that want their snapshots to be transportable need to implement this interface (IVSSHardwareSnapshotProviderEx) so that they can be mounted in post snapshot. The block against mounting hardware-based snapshots is done even when the snapshots are not transportable. This causes the Hyper V VSS Writer to fail.
For more information see the following Microsoft Web sites:
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