Yesterday installed a new update "Update Rollup 6 for Exchange Server 2010 Service Pack 3" to the mail server. The update is available on the link "http://support.microsoft.com/kb/2936871/en-us". Today I want to warn error encountered during an installation . My DAGFileShareWitnesses placed on one of the CAS servers. CAS servers on NetScaler balanced.
1. When installed on a server with the role mailboxes restart service on CAS servers. And as it was supposed to make everything transparent to the user - the first surprise flurry of calls - "but what about the mail?"
2. Second surprise : when you install on a server with the role of CAS permissions to update DAGFileShareWitnesses were changed because of what the mail databases started driving mailboxes between servers. Then open Event Viewer/System you found errors event id 1564 "File Share Witness (): Failed is offline.". To fix this add the right group Exchange Trusted Subsystem on shared folder in DAGFileShareWitnesses as shown in Figure and Stop/Start Cluster Service in Failover Cluster Manager.
1. When installed on a server with the role mailboxes restart service on CAS servers. And as it was supposed to make everything transparent to the user - the first surprise flurry of calls - "but what about the mail?"
2. Second surprise : when you install on a server with the role of CAS permissions to update DAGFileShareWitnesses were changed because of what the mail databases started driving mailboxes between servers. Then open Event Viewer/System you found errors event id 1564 "File Share Witness (): Failed is offline.". To fix this add the right group Exchange Trusted Subsystem on shared folder in DAGFileShareWitnesses as shown in Figure and Stop/Start Cluster Service in Failover Cluster Manager.
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