HA Active/standby License re-activation and howto for upgrade from 11.2.1 to 11.5

Hi Lewis, The reason for the specific upgrade path in version 10.x and v11 is that there were fundamental changes to the partitions and other items. With the ugprade from 11.2.1 to 11.5.1 is pretty much standard upgrade practice you find release notes on 11.5.1. The release notes are very important and they usually tell you what steps to take or what to watch out for and a checklist.

The approach you have already stated is something I use myself or my team

1. Establish a baseline (Check your CPU, Memory, Throughput to make sure you have a known pattern)
2. Upgrade Standby unit
3. Fail over Primary Active unit to Secondary
4. Have your application tested by clients or developers
5. Upgrade the Primary (Standby) unit and then fail over
6. Test failover in both directions

It's important that you do not synchronize until both units are on the same code If you are not very confident then contact F5 support or your FSE and have them run through your upgrade guide. In some cases you could plan it so that a F5 support person works the upgrade with you.

I hope this helps,

-=Bhattman=-