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DPM 2007 hyper-V backup problem

Posted on 2010-09-08
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Last Modified: 2012-05-10
I'm using DPM2007 for backing up a hyper-V guest server. Since few days the backup cannot run with the following error:
DPM encountered a retryable VSS error. (ID 30112 Details: Unknown error (0x800423f3) (0x800423F3))

I have found on the microsoft site a fix for this problem but it seems my hyper-v host is on a newer patch level since I cannot install the fix. It says the update does not apply to your system

http://support.microsoft.com/kb/959962

Is there any other workaround I could try?

thanks in advance...

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Question by:Papa_Shango
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by:dax_bad
ID: 33625447
What version of hyper V are you running? sp1,sp2 or R2?
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Expert Comment

by:dax_bad
ID: 33625477
And is the VSS writer listed when you run?

cmd prompt:: vssadmin list writers

Did you try to restart the Hyper-V Virtual Machine Management service on the VM?
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Author Comment

by:Papa_Shango
ID: 33625599
I'm using the Hyper-V on a Server 2008 SP2 the exact Hyper-v version is the following: 6.0.6002.18005

The VSS writer is listed but it is in failed state

Writer name: 'Microsoft Hyper-V VSS Writer'
   Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
   Writer Instance Id: {6a351919-481c-49e9-ad5d-8f069c8d5711}
   State: [8] Failed
   Last error: Retryable error

I will try to restart the VMM service at a later scheduled time because this is a production server.
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by:dax_bad
ID: 33626056
sorry its the Hyper-V volume shadow copy requestor service you need to restart on the VM, this wont affect the server availability.
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Author Comment

by:Papa_Shango
ID: 33626212
O.K. I have restarted the Volume Shadow Copy service, but unfortunately the result is the same the state of the VSS writer is still Failed.
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Expert Comment

by:dax_bad
ID: 33626226
Any related events in the system & App log on the VM?

/Daniel
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Expert Comment

by:dax_bad
ID: 33626239
And what OS is running on the guest VM?
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Expert Comment

by:dax_bad
ID: 33626390
Hey again,

Here's some more interesting stuff on this issue:

http://blogs.technet.com/b/askcore/archive/2009/07/30/dpm-2007-troubleshooting-protection-for-hyper-v.aspx

Check the resolution steps, especially step 2(below):

    1.  Hyper-V Integration components is installed and is running the latest version

    NOTE: (On the Host/Parent partition you can check VMMS.exe = 6.0.6001.22352 (or newer) and in the guest, check vmbus.sys version 6.0.6001.22334 (or newer)

    2. No Dynamic disks inside the guest.

    3. All volumes are NTFS

    4. All NTFS volumes must be >1GB and have >300MB free space.

    5. Shadow copies within the VM are on the same volume or are Disabled

    6. VM is in running state.on host

    NOTE: Offline Backups of Windows 2000 Guest VMs fail. Cause: A synthetic SCSI Controller was configured for the VM with no drives attached. Windows 2000 Guests do not support the SCSI Controller, so it is not needed.
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Accepted Solution

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dax_bad earned 0 total points
ID: 33626423
A backup of virtual machines fails when you use the Hyper-V VSS writer to back up virtual machines concurrently on a computer that is running Windows Server 2008

http://support.microsoft.com/default.aspx?scid=kb;EN-US;971394

This one is related to win2k8 SP2
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Author Comment

by:Papa_Shango
ID: 33626936
Thanks, I just installed succesfully the hotfix you linked above (KB971394) on the host machine, but I can restart it only tomorrow. I hope it will help.
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Author Comment

by:Papa_Shango
ID: 33661329
After a server restart, the VSS writer state is seems to be O.K. but when I start a retry of the backup on the DPM server it failed and the VSS writer state is becomes failed state again.
Finally I deleted the whole protection group in the DPM server and recreate it from scratch and now the backup runs succesfully.
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