The clustering team have posted a useful step-by-step guide to setting up Hyper-V with Cluster Shared Volumes on Windows Server 2008 R2 so that you can perform live migrations of virtual machines. The details are here: http://blogs.msdn.com/clustering/archive/2009/02/19/9433146.aspx Cheers, Ben
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Guide to setting up Hyper-V + CSV + Live Migration