This section describes how to upgrade vCenter Servers from 7.0 U3f to 7.0 U3h in Active, Passive, and Witness nodes, if your vCenter Server Appliance is configured in a vCenter High Availability (HA) cluster.
Log into vCenter Server Appliance Management Interface (VAMI).
Verify the status of all vCenter services are healthy and started.
Follow the Prerequisites for Upgrading vCenter Server High Availability Environments.
The upgrade sequence of vCenter Server VMs must be Witness => Passive => Active.
vCenter Server is upgraded successfully and all services are up and running.