Because we have an updated plan for our entire virtual system (From 4.1 to 5.1) I created new vCenter and Clusters enable with the same version of EVC. If you need to move the hosts without downtime, you need to do these step carefully.
1. Make sure both cluster (4.1 and 5.1) have the same version of EVC. Just created a new empty cluster within vCenter 5.1 and enable EVC feature.
2. Remove hosts from old cluster.
3. Add the hosts to vCenter 5.1. Under Data Center not the cluster
4. Drag the hosts into your cluster.
That's it !
Seems easy, but if you have difference version of EVC, you might need to follow the step from KB which may requires downtime if you don't have enough resource to hold your virtual machines.
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