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Hyper-V snapshots growing until disk is full?

Posted on 2011-03-07
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Last Modified: 2012-05-11
I have a legacy application that requires Windows 2000 server.  Last September we virtualized the box on Hyper-V.  It was the only VM running on the host.  This past weekend, the host ran out of disk space because two Hyper-v snapshots very suddenly began growing in size until the available disk space on the host was full.   The snapshots in question had both been taken over 4 months ago.   I was unable to delete the snapshot files because the merge process was failing do to lack of disk space.

In order to get the VM back online I was forced to move it to a new host with more disk space.

I understand that my setup did not follow best practices, but I'm looking for insight into why the snapshots began increasing in size.  Any help would be appreciated.
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Question by:gtkdw
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 35062574
You shouldn't really use snapshots in production for more than 2 days.

The reason the snapshots grew, is because all the changes (deltas) in the OS Server, are written to the snapshot AVHD file, until you stop and merge the snapshot.

Snapshots should be used for minor changes, like Patch Management Rollback. Otherwise you'll have issues with disk space.

Snapshots are not a backup.
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by:gtkdw
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@hanccocka

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