I cannot find the proper instructions to perform and upgrade from 10.2 to 10.3 redundant configuration (VE - virtual edition).
The last mentions on upgrading redudant systems are:
- v8 has steps for physical environments and mentions that VE doesn't support redundant configurations
- v9 mentions that there are significant improvements on redudant configuration upgrade process
but basically nothing more.
So far I got this from support:
Previously, upgrading via the VIP upgraded both servers, but with 10.3, you have to:
break the redundancy
power down the secondary
upgrade the primary, and the primary will reboot
WHEN IT HAS FINISHED, power down the primary, and power up the secondary.
Upgrade the secondary, then when it reboots
power up the primary and recreate the redundancy from the primary server.
I'm just not aware of any special precautions and risks. Just that this is a sensitive deployment with AD integration, 400 polycom phones, mixture of Phone profiles and settings for both Skype for Business and Cisco.