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In the spirit of Jay's message, we have a long-running cluster 
(diablo/kvm) where about once every 3-4 weeks a user will complain that 
she cannot connect to a vm. Examining the compute node shows that 
libvirt-bin is hung. Sometimes restarting this process fixes the 
problem. Sometimes it does not, but rebooting the compute node and then 
the vm does. I just heard from people in my company operating another 
cluster (essex/kvm) that they have also seen this. I filed a bug about a 
month ago

https://bugs.launchpad.net/nova/+bug/931540

Has any one been running a kvm cluster for a long time with real users 
and never seen this issue?

  -David