We recently installed Exchange 2010 in our environment and ran a site DR test today. We have DAG with 2 CAS/HUB/MBX servers at the primary site and 1 MBX server at the DR site. The DR site is a primary for a different office and has 3 CAS/HUB/MBX servers. The DR failover worked just as it should, we turned off the two Exchange servers at the primary site, and evicted them from the DR server. The MBX server is on line with the alternate FSW and servicing email. When we tried to failback, we started the 2 primary email servers and cannot start the cluster service one either server. We get the following error when starting the cluster service:
Log Name: System
Event ID: 1090
Task Category: Startup/Shutdown
The Cluster service cannot be started. An attempt to read configuration data from the Windows registry failed with error ’2'. Please use the Failover Cluster Management snap-in to ensure that this machine is a member of a cluster. If you intend to add this machine to an existing cluster use the Add Node Wizard. Alternatively, if this machine has been configured as a member of a cluster, it will be necessary to restore the missing configuration data that is necessary for the Cluster Service to identify that it is a member of a cluster. Perform a System State Restore of this machine in order to restore the configuration data.
We tried to force cleanup of the cluster from both servers and tried to start the DAG on both servers but neither is working.
Can someone please assist?