Hi-
We have Exchange2010 with 3 CAS/Hub servers and 3 mailbox servers in a DAG - all are VMWare VMs. One of the mailbox servers just has some passive copies; two of the mailbox servers have active and passive copies and do the backups. We use EMC Networker 8.1 with the Networker Module for Microsoft Applications for backups. Those backups run successfully most of the time.
I'm experiencing the following issue:
Occasionally, the backups fail, and the next morning the system logs on the mailbox servers have cluster related errors. Also, VSSadmin shows the Exchange writer in a retryable error state. The backups will continue to fail until the writers are reset with a reboot.
This morning, the backup did NOT fail, but there were cluster related errors, causing me to check the writers on the mailbox servers. They were again in the error state.
The event logs point to a network error, but I assume the failure of the cluster could be related to unresponsive machines. I've asked our infrastructure team to investigate, and they have found no indication of a problem at the network, vm, or storage level.
Has anyone seen this, or could point me to diagnostic information?
Thanks