Forum Discussion

Stefan_Klotz_85's avatar
Stefan_Klotz_85
Icon for Cirrus rankCirrus
Dec 11, 2014

Standby LB becomes Active during HA software update

Normally a software update within the same major release and especially just a Hotfix update is a very easy and less critical task without any downtime. We are using the following steps:   relice...
application delivery
LTM
mimlo_61970's avatar
mimlo_61970
Icon for Cumulonimbus rankCumulonimbus

The word from support is that it is recommended to Force Offline the standby unit while you upgrade it. When you are ready to upgrade the primary, Force Offline the primary and Release Offline on the standby. The reason stated is that HA Active/Standby will not work properly on two different versions.

 

I have to say this has happened to me only once through probably 100s of upgrades using network failover all the way back to version 9.4

 

shaggy's avatar
shaggy
Icon for Nimbostratus rankNimbostratus
Dec 15, 2014
i've had the same experience. very rarely (knock on wood) through >100 upgrades have i experienced unexpected failovers. i have, however, had unexpected failovers caused by something in my config, such as unexpected behavior from HA groups/vlan failsafe/bad failover addresses. force-offline is nice, but prevents me from seeing that everything came up successfully post-upgrade