Upgrading Db2 servers in HADR environments
Upgrading a single partition Db2 version 10.5 Fix Pack 6 or earlier primary database, a Db2 pureScale® version 10.5 Fix Pack 8 or earlier primary database, or a Db2 pureScale version 11.1 GA primary database to Db2 version 11.5 changes the database role from primary to standard.
Upgrading a single partition Db2 version 10.5 Fix Pack 6 or earlier standby database, Db2 pureScale version 10.5 Fix Pack 8 or earlier standby database, or a Db2 pureScale version 11.1 GA standby database to Db2 version 11.5 is not supported because these databases are in rollforward pending state.
Because of these restrictions, upgrading an HADR environment to Db2 version 11.5 requires that you stop HADR, upgrade your Db2 server where the primary database resides, and then reinitialize HADR.