Today, and a couple times in the past, this customers DC/GC(s) have either crashed or rebooted for emergency patching. The Event Viewer shows the DC/GC switchover as expects, then messages begin to randomly queue up in MTA folder, steadily getting worse and worse. The only solution provided by Cisco is to failover to secondary (all the UMR messages dump out at that time) then restart the entire primary server, then failback. Last ticket told me this was "expected" behavior.
There are also many times when the system recovers just fine from DC/GC reboots....
Does anyone else have this unreliable situation?
It is a large Exchange environment (10 DC/GCs and 20 Exchange Servers)