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exchange 2016, DAG, WINDOWS SERVER 2016, PATCHING

Medium Priority
Last Modified: 2020-03-26
i want to do OS patching on DAG  which has 100 exchange servers  which are windows server 2016.

we are deploying vulnerability patch

do we need to put mailbox servers on maintenance mode as well?, will failover occur as well.

do we need to migrate PAM ?

any steps would help
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Network Engineer
Huh? The largest DAG supported is 16 members.

Have you never patched Exchange before?

Steps required depends on your environment. How is load balancing of clients done?

Our experience is that there can be all sorts of mis-configuration issues that can cause disruption when doing failover. If everything is setup well, then at least failover between DAG members in a single site is pretty darn seamless. I think that failover between sites would take more management as clients would likely need to get pointed to a new server/load balancer for access.