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Compacting Volume

    Question

  • Hi all-  this problem is somewhat vague, so apologies in advance...

    I was going to post this in the exchange forum, but the problem really lies within Windows Server Backup on my exchange server.

    problem system:

    WS2012R2 running Exchange 2016 CU9 - running as esxi vm.

    The problem:

    I have this server configured to do a full vss backup nightly of the entire exchange server.   Very small in the grand scheme of things ~ only about 260GB total.

    For about the last 10 days, I've noticed that my server backup is running excessively long, @ roughly 14 hours. It's getting hung up trying to compact the virtual hard disk EVERY night, on my dedicated exchange database volume.

    We ran for months with this configuration with zero problems, backups would take about 1-2 hours, and now all of a sudden...

    The only thing I haven't done is convert the .etl file to text to get some more detail, but here's the latest backup logs from the 4/29 job:  (4/30 is STILL running)

    Backup of volume \\?\Volume{9f60e555-6b42-11e7-80b4-806e6f6e6963}\ succeeded.

    Backup of volume C: succeeded.

    Backup of volume D: succeeded.

    Backup of volume E: succeeded.

    Backup of volume F: succeeded.

    Backup of volume G: succeeded.

    AND associated 'Error log' from 4/29:

    <blank>

    The event logs are clean, I'm not sure where to even start looking.....any help would be greatly appreciated.

    thx

    tm


    Tim Magnuson | MCTS, MCITP | MCCA 2011 |
    Ok, so I changed my name...you can still call me Tom if you like. It's a...jump...to conclusions...mat.
    My Blog Site: http://tmagnuson.wordpress.com

    Monday, April 30, 2018 2:18 PM

All replies

  • Hi Tim,

    Windows Server Backup stores the backups in a virtual hard drive (VHD).

    Windows Server Backup will perform checks against the VHD and determine if the file needs to be compacted.

    If the file needs to be compacted Windows Server Backup will perform the compaction during a regularly scheduled backup.

    Depending on the size of the VHD file, the compaction may take a really long time sometimes in excess of 10 hours.

    The compaction of the VHD files is normal and should occur infrequently. The backup should complete once the compaction is complete.

    For more details, please refer to :

    http://support.microsoft.com/kb/2524602

    Best Regards,

    Mary


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Tuesday, May 01, 2018 2:40 AM
    Moderator
  • I've read that article several times

    It says "Compaction of VHD files is normal and should occur infrequently."  My server has been doing this nightly for the past 10 days.

    thanks,

    tm


    Tim Magnuson | MCTS, MCITP | MCCA 2011 |
    Ok, so I changed my name...you can still call me Tom if you like. It's a...jump...to conclusions...mat.
    My Blog Site: http://tmagnuson.wordpress.com

    Tuesday, May 01, 2018 1:27 PM
  • Hi,

    Thanks for your feedback.

    I'm  sorry for now, I couldn't find more explanation from Microsoft about Compacting Volume message for windows server backup.

    In your scenario, it even doesn't show any error.

    I'm afraid you could consider to contact Microsoft Customer Support Services (CSS) for dedicated support.

    It is also appreciated that the other members in our forum can share their experience with us about this scenario.

    To obtain the phone numbers for specific technology request, please refer to the website listed below:

    https://www.microsoft.com/en-us/worldwide.aspx

    Appreciate your support and understanding.

    Best Regards,

    Mary


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Wednesday, May 02, 2018 4:39 AM
    Moderator