Non-Transportable Snapshots are blocked from being mounted causing the Hyper V VSS Writer to Fail

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

Source: VSS

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.

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Writer name:� Microsoft Hyper-V VSS Writer Process command line: VMMS.EXE Exception code 0xE06D7363

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In the VSS Trace log you would see the following entries:

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00001169������������ 6.48172474��������� [3464] [0000671350,0x000d88:0x0e9c:0x502f1f48] EXIT� {CVssHardwareProviderWrapper::QueryInternalInterface}: ������

00001170������������ 6.48176813��������� [3464] hr: 0x80004002��� <---- E_NOINTERFACE

00001171������������ 6.48180771��������� [3464]�

00001172������������ 6.48184967��������� [3464] [0000671350,0x000d88:0x0e9c:0x502f1f48] EXIT� {CVssHardwareProviderWrapper::QueryInternalInterface}: ������

00001173������������ 6.48188543��������� [3464] hr: 0x80004002��� <---- E_NOINTERFACE

�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.

Implement IVSSHardwareSnapshotProviderEx

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For more information see the following Microsoft Web sites:

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�http://msdn.microsoft.com/en-us/library/aa384236%28VS.85%29.aspx

http://blogs.technet.com/filecab/archive/2008/01/29/what-s-new-in-windows-server-2008-vss-hardware-shadow-copy-scenarios.aspx

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