By default, if you shut down a cluster host, say, because you're deploying a Windows Update, or a new version of a backup or monitoring client, the situation is different. Windows will use Quick Migration to move the virtual machines from one host to another. "Improve your Hyper-V Virtual Availability - Live Migrate VMs on Shutdown" article describes how to use PowerShell and Group Policy and take all the virtual machines on thr host and distribute them across the cluster.
Recently, I've upgraded all my Hyper-V host in my lab to Windows 2012 and I realized, that this solution doesn't work anymore out of the box.....
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