Just a thought. Since you are already using vSphere 5.1, take a look at vSphere Replication to see whether this could be an option for you to move the VM's to the other datacenter with the least required downtime.
André
Just a thought. Since you are already using vSphere 5.1, take a look at vSphere Replication to see whether this could be an option for you to move the VM's to the other datacenter with the least required downtime.
André