In our data center we have two separate vSphere vCenter clusters (but they do share the same VM and VMkernel LANs). One is running vSphere Standard 5.5 and the other is running vSphere Enterprise Plus 6.5. Both have their own SAN. Each cluster can not "see" the other cluster's SAN.
NOTE: We wish to accomplish the following without lowering the EVC mode on the new cluster. The new cluster IS running at a higher EVC mode than the old.
1) Is it possible to "disconnect" a host from the old 5.5 Standard cluster and "connect" it to the new 6.5 cluster, and then vMotion + Storage vMotion any VMs it may be managing over to a host + storage in the new 6.5 cluster - without any VM down time?
2) After performing the procedure in question 1), would it then be possible to "disconnect" that same host from the 6.5 cluster and "connect" it to the old 5.5 cluster once again?
3) Are there risks / consequences / other things we should be aware of? We do know that we should disable HA on the old cluster before attempting this.