Exchange 2013 CU4

a while back, the blades where my PDC, MB02, CAS02 are hosted suddenly went down. the other half of my DAG is still online as well as several DC servers. however, the high availability we were expecting with the deployed Exchange didn't happen. everyone is offline with Exchange.

only when the downed servers came online and after several minutes after they became online did our Exchange services returned. in this regards, what did we do wrong that we didn't achieved high availability?

one question keeps haunting me, does Exchange rely heavily on the Windows file cluster?

this is my Exchange block diagram below. the load balancer repositioned is was pointing to the remaining, alive Exchange server.

regards,

Rino

• Edited by Reno Mardo Monday, September 07, 2015 10:00 AM

Hi

Where is your witness server? Did you loose that too?

BR
Steen

• Edited by steenpedersen Monday, September 07, 2015 10:58 AM

Also, check the application event log during the failure. It may be that Exchange did not failover to the other mailbox database copy for some reason. Perhaps due to a long replay or copy queue or failed content index as you say.

Thanks.