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DPM2010 - Backup using Child partition snapshot not working

Answered DPM2010 - Backup using Child partition snapshot not working

  • Mittwoch, 21. September 2011 22:31
     
     
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    I have a VM that is being backed up using the "Backup Using Child Partition Snapshot".  The problem is, when the backup runs, it runs as it if were doing a "Saved State" backup.  It first saves the machine then bring it back online roughly 30sec later.  Any idea why this is occurring and how I can get this backup to function as designed?  The only thing that is worth to note about this machine is that it has multiple iSCSI disks connected to it from within the Guest OS.

    Thanks

     

     

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  • Donnerstag, 22. September 2011 00:11
     
     
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    Hi,

    try to remove the machine from the Protection Group and readd it. It will probably be named "Saved State".

    If a parameter is changed after the VM is add to a PG then the change will not reflect on the name shown in the console.

    Check if there is something new on your VM like dynamic disks.

     
  • Donnerstag, 22. September 2011 00:21
     
     
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    This server doesn't have any dynamic disks.  I did install the Failover Cluster Manager on the Host Server, but am not currently running anything on a CSV.  Is there anything else you can suggest I look for?  Is there a list of features that the Child Partition Snapshot doesn't support?

    Thanks


    • Bearbeitet Caleb44 Donnerstag, 22. September 2011 00:23 added question
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  • Donnerstag, 22. September 2011 11:34
     
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    Hi,

    take a look at this page : http://technet.microsoft.com/en-us/library/ff399205.aspx

    • Backup (Volume Snapshot) Integration Service is disabled or not installed.

    • VM has one or more dynamic disks.

    • VM has one or more non-NTFS based volumes.

    • The VM Cluster Resource Group in a cluster setup is offline.

    • VM is not in a running state.

    • A ShadowStorage assignment of a volume inside the VM is explicitly set to a different volume other than itself.

     

    Can you try to remove the protection and readd it to see which type of backup is offered ?

    • Als Antwort markiert Caleb44 Donnerstag, 22. September 2011 17:53
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  • Donnerstag, 22. September 2011 17:53
     
     
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    You found it!  

    - A ShadowStorage assignment of a volume inside the VM is explicitly set to a different volume other than itself. 

    I'm a little bummed that is a limitation, but I should be able to work around it easily in this scenario.  I have not tested this yet.  Do you think the server needs to be restarted after making this change?

    Thanks for the help Jeremy!

    • Als Antwort vorgeschlagen K Phung Dienstag, 19. Juni 2012 21:34
    • Nicht als Antwort vorgeschlagen K Phung Dienstag, 19. Juni 2012 21:35
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  • Samstag, 24. September 2011 23:22
     
     
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    Do this did the trick.  I did not have to restart the machine. I did notice that while performing the backup, the Hyper-V Host reads the entire VHD file from disk and then only transfers changes.  It was my thought only changes would have been read and transferred.  Is there something else that is configured wrong or is this by design?

    Thanks

     
  • Donnerstag, 26. Januar 2012 20:28
     
     
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    Do this did the trick.  I did not have to restart the machine. I did notice that while performing the backup, the Hyper-V Host reads the entire VHD file from disk and then only transfers changes.  It was my thought only changes would have been read and transferred.  Is there something else that is configured wrong or is this by design?

    Thanks

    regarding my comment, I confirmed that this is by design.  It looks like in DPM2012, only changes will be read and transferred.  Nice perk for 2012.
     
  • Donnerstag, 26. Januar 2012 23:36
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    Hi,

    <SNIP>
    It looks like in DPM2012, only changes will be read and transferred.
    >SNIP<

    The above is true for standalone Hyper-V servers, DPM will use it's filter driver to track block level changes to .VHD's and only transfer changed blocks without having to read the entire VHD for a VM.  However, Hyper-v clusters using CSV will still use the method used in DPM 2010 today.

    Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.
     
  • Donnerstag, 26. Januar 2012 23:49
     
     
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    good to know.  Thanks Mike.