I have a 2-member DAG and 2-member CA/HT CAS array Exchange 2010 system. CA1 server is designated as the primary DAG witness, CA2 is the alternate witness.
At one time I had used the third CA server CA3 as one of the file share witnesses. This server, CA3, has been powered off for a few months, but not yet removed from the Exchange system.
Even though CA3 is no longer a designated witness, (and it’s not even powered on), I still keep getting the following error with Event ID 1564:
File share witness resource 'File Share Witness (\\ca3.MyOrg.org\DAG.MyOrg.org)' failed to arbitrate for the file share '\\caht1.MyOrg.org\DAG.MyOrg.org'. Please ensure that file share '\\caht1.MyOrg.org\DAG.MyOrg.org' exists and is accessible by the cluster.
Occasionally my DAG is down for some unknown reason, causing mailboxes inaccessible, and I am wondering if the above event could be the cause. How can I fix this?
Thanks and regards.