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. http://techgenix.com/creating-failover-clusters/
blog article
CREATING FAILOVER CLUSTERS IN SYSTEM CENTER VIRTUAL MACHINE MANAGER
Before you will be able create a failover cluster from within System Center Virtual Machine Manager, there are a few prerequisites that must be met. First, the Hyper-V hosts that you are going to add to the cluster must all be running the same version of Windows Server. This article also assumes that the Hyper-V role is also installed on those servers, and that the hosts meet the basic requirements for failover clustering. You should also make sure that the Hyper-V hosts belong to a common Active Directory domain. I’m pretty sure that this isn’t actually a Microsoft requirement, but I have found that the odds of success go way up if your Hyper-V hosts are domain joined. READ MORE