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Hyper-V virtual reverted to over a year old version

Posted on 2015-02-22
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Last Modified: 2015-02-25
I have a Windows Server 2008 Standard server running Hyper-V.
All was good until we had a power outage the other day and my UPS batteries were not holding a charge for long (shame on me for not checking).  The servers powered off instead of being shut down.  I powered them all back on and things looked OK, until I realized 1 of my virtual servers reverted back to over a year ago.  
The program I had installed is still there and my credentials log me in, so I thought the program was running fine.  Now, I realize the data on that server is over a year old.
I've setup a number of Hyper-Vs and things have been working great, but I haven't had to do any real troubleshooting on an issue like this.
Any help in determining how this might have happened and, especially, recovering my virtual is greatly appreciated.  I would restore it to a current state, but this virtual is running my backup software, so I have nothing to restore.
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Question by:rickmills
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kevinhsieh earned 500 total points
ID: 40625155
The only way I can think of something like that happening is if you had a snapshot of the VM, probably a Hyper-V snapshot. Do you have any AVHD files on the host? Those are the snapshot files, and you should not have any snapshots  for more than a few days at a time.
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by:rickmills
ID: 40630457
It turns out it was an issue with the software that made it appear as though it had reverted back to an older version of the VHD.  Sorry, as I jumped the gun on that diagnosis.
This can be closed.
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Author Closing Comment

by:rickmills
ID: 40630458
It turns out it was an issue with the software that made it appear as though it had reverted back to an older version of the VHD.  Sorry, as I jumped the gun on that diagnosis.
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