I was told a little while ago to watch out for this patch from Microsoft. It improves how Hyper-V works in a clustered host environment. KB951308 can be downloaded once you accept a EULA. You should have a read because there is a long list of improvements.
- If you apply this update to a computer that is functioning as a Windows Server 2008 failover cluster, the failover cluster service must be restarted before the changes will take effect.
- If you apply this update to a system that is running the Failover Cluster Management console (the Cluamin.msc file), any open versions of this management console be closed and reopened before the changes will take effect.
Make sure you test this update before you or your company decide to install this update.