Is it necesary to purchase two Datacenter licences if your virtualization infrastructure includes two physical servers? [closed]

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http://serverfault.com – Possible Duplicate: Can you help me with my software licensing issue? We are looking to set up a virtualization environment. As I assume is standard this will include more than one physical server to run the virtual machines. As I also think is standard (I could be wrong, please correct me if I'm wrong) the servers will be in a master/failover type arrangement. Meaning the virtual machines will run on one, and if the server should fail the virtual machines are switched to the other. My question is, do I need to purchase two data center licences for Windows Server (probably 2008 (HowTos)