Hello, As this documentation states: "PAM supports VMware vMotion for live migration of both primary and secondary cluster members running on VMware vSphere.". Your understanding is correct. You should only move a minority of the primary site nodes at any given time, so that there will always be a quorum. If there is no activity requiring database changes at the time, you may get away with moving nodes at the same time, but the note on the page explicitly warns against moving half or more of the nodes in the primary site at the same time.