Upgrade load balanced SEPMs
To upgrade load balanced SEPMs, stop the SEPM services on both SEPMs before the upgrade. Do not upgrade both SEPMs at the same time. Once the first SEPM has upgraded it will start services again. Stop the SEPM services on this SEPM before starting the upgrade on the second SEPM.
Doing the upgrade in sequence will avoid having the database schema update running from both SEPMs. It will also avoid database locks. The second SEPM upgrade will be quicker as the database schema is already upgraded.
All the information shared in Upgrading and Migrating to the Latest Release of Symantec Endpoint Protection (SEP) is still applicable.