WHS 2011 Server Backup fails with error 2155348020 RRS feed

  • Question

  • Windows Home Server 2011 backups had been running fine for about 2 months. 

    About 2 months ago I had a failure on the backups like this and I rebooted the server and the problem "went away."

    Over the past 2 weeks it keeps happening about every-other-day now.  One backup will succeed, but the next night's backup will fail with this error ... and the pattern has mostly repeated like that over the past two weeks.  Sometimes two successes back to back, sometimes two failures back to back...but about 3 successes a week seems about average.

    Yesterday it happened again and I rebooted the server, but last nights backup again generated the same error.

    Looking in Event Viewer I see VSS logging error ID 7001:

    VssAdmin: Unable to create a shadow copy: Either the specified volume was not found or it is not a local volume.

    Command-line: 'C:\Windows\system32\vssadmin.exe Create Shadow /AutoRetry=15 /For=\\?\Volume\[47b8d170-8659-4301-aab6-1e7b708af11f}\'.

    When I go into a command prompt and run "vssadmin list volumes", indeed I do not see the above-referenced volume listed.

    When I bring up the WHS Console and initiate a backup manually, it complete successfully.  Only the timed/overnight backups are now failing (where they had succeeded for months before).

    The settings in the backup are for it to backup "Bare metal recovery, System state, (Disk does not have drive letter)".  The backup is grabbing all of Disk 0 which has the 100MB partition without a drive letter that Windows installer automatically made during installation, plus the C: drive. 

    Disk Management reports C: as Healthy (Boot, Page File, Primary Partition) and the 100MB unnamed partition as Healthy (System, Active, Primary Partition).

    I'm stumped.  Any help you can offer please?  Thank you in advance.

    Wednesday, August 3, 2011 3:29 PM

All replies

  • So I inadvertently posted this in the Windows Server forum and had someone tell me within 2 days it was posted in the wrong spot and to post it here. 

    Now it's been a week since I posted this and not so much as a peep :'(


    Anyone? ... please??? :)


    Tuesday, August 9, 2011 11:47 PM
  • Have you ever left an external drive connected to your server for an extended period of time?
    I'm not on the WHS team, I just post a lot. :)
    Wednesday, August 10, 2011 1:21 PM
  • As a matter of fact, yes I have left an external drive connected to the server.  It's a "permanently" connected external USB drive ... that's the drive that the server is backing itself up to.
    Wednesday, August 10, 2011 2:23 PM
  • Bueller?
    Monday, August 15, 2011 9:09 PM
  • Is the backup drive full or close to it when the errors occur? How large is the drive? How much data is being backed up?
    I'm not on the WHS team, I just post a lot. :)
    Wednesday, August 17, 2011 1:12 PM
  • The USB Drive (used to backup the WHS2011 C: drive) is a 500GB drive...with 95GB used and 369GB free.  

    The actual C: drive itself has 31GB of data on it.


    Wednesday, August 17, 2011 1:18 PM
  • Hi, Kelly

    In the outputs of vssadmin list volumes, what's the value for your external backup disk?

    Best Regards,


    Friday, August 19, 2011 9:34 AM
  • I don't know how to tell which volume is associated with which disk...the entire output of the vss list volumes command is:

    vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
    (C) Copyright 2001-2005 Microsoft Corp.

    Volume path: \\?\Volume{da7868d0-7988-11e0-9e4c-806e6f6e6963}\
        Volume name: \\?\Volume{da7868d0-7988-11e0-9e4c-806e6f6e6963}\
    Volume path: \\?\Volume{671e523b-7e62-11e0-9561-6c626d3b2de0}\
        Volume name: \\?\Volume{671e523b-7e62-11e0-9561-6c626d3b2de0}\
    Volume path: C:\
        Volume name: \\?\Volume{da7868d1-7988-11e0-9e4c-806e6f6e6963}\
    Volume path: D:\
        Volume name: \\?\Volume{16eaee23-3ba4-4316-bd7a-d6fa92c7a00c}\

    Saturday, August 20, 2011 1:58 PM
  • You can log in to the server desktop, then use the disk management tool from there. Select the partition on your backup disk, right click it, look at properties, then the security tab. It's probably the second volume in your listing above.
    I'm not on the WHS team, I just post a lot. :)
    Saturday, August 20, 2011 11:10 PM
  • You nailed it ... it's the 671e523b-7e62-11e0-9561-6c626d3b2de0 volume.
    Sunday, August 21, 2011 12:14 AM
  • Hi, Kelly

    So, the missing volume \\?\Volume\[47b8d170-8659-4301-aab6-1e7b708af11f}\'. is not your external backup disk.

    According to http://support.microsoft.com/kb/833779, it caused by some volume is removed when Shadow Copies of Shared Folders feature is turned on. So, you can follow that KB to remove the missing volume Shadow Copy task. Or, you can reconfig your server backup in dashboard.

    Best Regards,


    Monday, August 22, 2011 2:49 AM
  • Thank you for your response.

    Interestingly, since the last round of Microsoft Patch/Update Tuesday that hit in August, this error has not reoccurred.  (I originally posted this on August 3rd after the issue had been haunting me for the 3-4 weeks prior to that date).

    Now that the error isn't happening after August 9th's Microsoft Patches were released, I'm inclined to just leave things be.

    I have no idea if one of the patches from that day was truly the fix for the issue, or if it is just coincidence.

    If the error re-emerges, I will indeed proceed with the KB article you identified.

    Thank you again.

    Monday, August 22, 2011 3:09 AM