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.