Upgrade Db2 High Availability Disaster Recovery (HADR) environments

For Db2 Enterprise Server Edition users upgrading from Db2 Version 10.5 Fix Pack 7 or later, and for Db2 pureScale® users upgrading from Db2 Version 10.5 Fix Pack 9 or later, high availability disaster recovery (HADR) environments can now be upgraded without the need to reinitialize the standby database after performing an upgrade on the primary database. Reinitialization of the standby is still an option if the user wants, but is no longer the recommended option.

The supported HADR upgrade procedure requires the primary and standby databases both to be at a minimum of Db2 version. Any other prior level is not supported and attempts to use the documented procedure fails. For these prior level databases, the standby must be reinitialized by a backup image that is shipped from the primary after upgrade. The HADR upgrade procedure requires that one system/instance be identified to contain all primary databases and the second system/instance be identified to contain all standby databases. Where necessary, issue graceful takeover to achieve this layout of primary and standby databases.