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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:Â 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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00001169Â Â Â Â Â Â Â Â Â Â Â Â 6.48172474Â Â Â Â Â Â Â Â Â [3464] [0000671350,0x000d88:0x0e9c:0x502f1f48] EXITÂ {CVssHardwareProviderWrapper::QueryInternalInterface}: Â Â Â Â Â Â
00001170Â Â Â Â Â Â Â Â Â Â Â Â 6.48176813Â Â Â Â Â Â Â Â Â [3464] hr: 0x80004002Â Â Â <---- E_NOINTERFACE
00001171Â Â Â Â Â Â Â Â Â Â Â Â 6.48180771Â Â Â Â Â Â Â Â Â [3464]Â
00001172Â Â Â Â Â Â Â Â Â Â Â Â 6.48184967Â Â Â Â Â Â Â Â Â [3464] [0000671350,0x000d88:0x0e9c:0x502f1f48] EXITÂ {CVssHardwareProviderWrapper::QueryInternalInterface}: Â Â Â Â Â Â
00001173Â Â Â Â Â Â Â Â Â Â Â Â 6.48188543Â Â Â Â Â Â Â Â Â [3464] hr: 0x80004002Â Â Â <---- 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://msdn.microsoft.com/en-us/library/aa384236(VS.85).aspx)
http://blogs.technet.com/filecab/archive/2008/01/29/what-s-new-in-windows-server-2008-vss-hardware-shadow-copy-scenarios.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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