An error occurred while restarting virtual machine after taking a snapshot.

Summary:
I was receiving the above error usually immediately after netbackup attempted consolidating the backup.

VMware KB:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033571

My particular issue:
Seemed to revolve around the fact that I had "Storage I/O" control enabled on my datastores that was causing this issue.  It was odd that only 1 VM seemed to be affected, but after turning it off the symptoms stopped.  Reading the KB above seems to allude to this fact, but I'm still researching.

My resolution:
Turning off Storage I/O control.

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