Good afternoon
I am operating a two server Exchange 2013 environment with both servers being members of a DAG.
The two systems are installed on 2U 4 servers system that utilises some shared hardware. I need to replace some RAID controller batteries and basically the whole thing is going to have to be turned off and so I cannot put each server into maintenance mode in turn to perform the upgrades.
Is there anything special I need to do to or can I just shutdown the two Exchange servers? I understand there may be some mail loss during the downtime (although hopefully not as it will be a short time and SMTP obviously has retry built into the protocol).
Another thing to note is that the FSW for the DAG is also installed in this 4 server system and that will obviously be offline during the downtime period too.
Any opinions or advice would be greatly appreciated.
Thanks