This section describes how to upgrade vCenter Servers from 6.7 U3 to 6.7 U3j in Active, Passive, and Witness nodes, if your vCenter Server Appliance is configured in a vCenter High Availability (HA) cluster.
Prerequisites
Attach the upgrade ISO image to all three VMs (Active, Passive, Witness).
Note:
The upgrade sequence of vCenter Server VMs must be Witness => Passive => Active.