I found the other week that my Hyper-V server, running Server Core and nothing else was restarting all of its own accord. As this is just a server at home, and the monitor is switched off 99% of the time I had not noticed it blue screening.
So looking in the event log (remotely of course, as it was running Server Core) to see why, I noticed it had done the same thing every day at a few minutes past 1pm - one of my scheduled backup times during the day.
I was getting Event ID 1001 at about 1:03pm each day. So I changed the time of the backup (using Windows Server Backup, command line) to 11pm and I got 1001 bugchecks at 11:03pm each day.
There was nothing else recorded in the event log, apart from the usual system start/TCP-IP etc messages and no clue as to the reason for the failure. All I had was the BugCheck, an example being 0x0000007e (0xffffffffc0000047, 0xfffff80003676b48, 0xfffffa60019ff5c0, 0xfffffa60019ff660.
A bit of research later, and ignoring most of the posts regards VSS and Hyper-V I came across http://support.microsoft.com/kb/958662/en-us and http://support.microsoft.com/kb/960038/en-us (the latter of these is a hotfix) which I applied and solved the problem.
It would seem that Hyper-V and VSS based backups have an issue with some backups if a virtual machine is in a running state. It is possible to save the Hyper-V guest machine and then back it up without issue, but of course this kicks people of the virtual machine - a bit pointless really unless its a development machine. To turn off backup for a Hyper-V machine, so that the server does not bluescreen then either disable the Backup (volume snapshot) option in the guest machine settings, under Integration Services or install the hotfix and reboot once.
permalink posted by Brian Reid : 3:57 PM
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