We use snapshots regularly prior to patches or changes to virtual machines. Usually this process works very well.
Today I encountered issues after trying to delete a snapshot to a virtual machine. The Hyper-V manager reported that the merge failed, then all subsequent attempts to merge or remove the snapshot also failed. This appears to related to the core configuraton, as all of the VM's I was working on exhibited the same issues.
In the end I worked around the problem by creating new VM's, manually merging the snapshots and attaching the VHD's to the newly created replacement VM's.
Unfortunately this means the NIC's are no longer the same, so static IP's etc need to be reassigned.
This blogpost has a comprehensive how to for merging single and multiple snapshots manually.
With the VM's now running, I can begin to investigate the root cause of the issue.
The following technet articles detail some of the underlying configuration for a Hyper-V host.
Backing up and restoring Virtual Server
Virtual Server folders and files
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