How do you do software upgrades without downtime in DB2 HADR?

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 You can perform DB2 Fixpack update on the servers configured with HADR setup.

 Please follow the below steps to do that task 

Steps to acheive it :

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1) First verify HADR is in peer state for both DB2 Primary and Standby.

2) Deactivate the HADR on the standby server.

3) Upgrade the standby server with the needed Fixpack version.

4) Start the standby again until it catches up with the primary server.

5) Issue a TAKEOVER command so that servers will change roles.

6) Suspend the new standby server.

7) Upgrade the new standby server.

8) Reactivate the new standby until it catches up with primary server.

9) Again operate the TAKEOVER command so that they will come back to their original primary and standby roles.

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