I have a Server 2003 running Virtual Server 2005. It has about 10 servers running off of it.
The host has 16gb of ram.
I had to reboot the host after running some updates.
All the guest came up fine.
I went on a vacation and when I came back I noticed one of my guests wasn't working and the processor usage on the host was maxed out.
Of course my weekly backup ran when the guest went bad.
This is a long shot, any suggestions, before I piss off some developers