I have a question regarding a migration, I want few Esxi host (version 5.1) from vCentre 6.0 to get it migrate on on Vcentre 5.1. I would be preparing new cluster and then adding Host. I had questions though I have the same network LAN and storage on the vCenter (version 5.1). Do I need to directly disconnect the host and add to the cluster or do i need to first poweroff all the VMs and then disconnect the host? Please let me know ASAP.