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

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Source: Microsoft Support
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Symptom


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.

 

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:

 

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
Cause


 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.
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Article ID: 961984 - Last Review: 01/14/2015 12:07:36 - Revision: 1.0

  • Windows Server 2008 Standard
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Datacenter
  • kbnosurvey kbarchive kbnomt kbrapidpub KB961984
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