If any of the shared disk resources used by the groups in the cluster are damaged, you may need to replace the failed hard disk and restore the contents of the lost disk from backups. A cluster server relies on disk signatures to identify and mount volumes. If the disk signature for a shared disk resource should change, it could prevent the Cluster service from starting.

For more information about how to resolve this problem, see Microsoft Knowledge Base article Q280425, "Recovering from an Event ID 1034 on a Server Cluster" (http://go.microsoft.com/fwlink/?LinkId=3052&ID=280425).

If any drives containing database files or transaction log files are lost, you must use your Exchange database backups to recover those drives.
To restore a backup of the Exchange 2000 cluster node databases, you must perform steps that are similar to restoring Exchange databases to a stand-alone member server. The only difference between these processes is that, when restoring the cluster node databases, you use the computer (NetBIOS) name of the Exchange virtual server computer instead of the Windows 2000 computer name of the cluster node.

The NetBIOS name of the Exchange virtual server is located in the Restore to text box of the Windows 2000 Backup utility. The virtual server's NetBIOS name is the same computer name that users use to connect to their Exchange 2000 virtual server running in the cluster. You can back up and restore the Exchange databases of an Exchange 2000 virtual server from any node within the cluster, or from any other Exchange 2000 server in the domain.
For detailed information about how to restore Exchange databases, see "Restoring Exchange 2000 Databases" .

The quorum disk resource is a shared disk resource that contains details of all the changes that have been applied to the cluster database. The quorum disk resource is accessible to other cluster resources. Therefore, if one node fails over to another, all cluster nodes have access to the most recent database changes.
If the drive containing the quorum disk resource is lost, you can use the Backup utility and the Cluster Quorum Restore utility (Clusrest.exe) to recover the drive. First, you use Backup to restore the quorum data to the node that owned the quorum disk. Specifically, you restore either a full computer backup or Windows backup to the node that owned the quorum disk resource.
When you restore either of these backup sets, the System State data, which includes the quorum disk resource data, is restored. For information about how to back up the quorum disk resource, see "Backing Up the Quorum Disk Resource" .
After the quorum data is restored to the node that owned the quorum disk resource, you use Clusrest.exe to move the quorum data from that node to the new quorum drive resource drive.

To restore a quorum disk resource

1. If the signature of the hard disk to which you are going to restore the quorum has changed since it was backed up, use the Dump Config tool to restore the signature. The Dump Config tool is located in Microsoft Windows 2000 Server Resource Kit.
2. Stop the Cluster service on all nodes except the node that is performing the restore.
3. Use Backup to restore the Windows backup set or full computer backup set to the replacement node. (Restoring the System State data creates a temporary folder under the Winnt\Cluster\Cluster_backup folder and populates that folder with quorum disk resource data). After the backup set is restored, restart the computer. Important Because the System State data is specific to the hardware and configuration on a computer, you can only restore a Windows backup set or full computer backup set to the computer where the backup was created. For more information about how to restore a Windows backup set, see "Restoring Windows 2000 Backup Sets".
4. On the node where you restored the Windows backup set or full computer backup set, use the Cluster Quorum Restore utility (Clusrest.exe) tool to restore the contents of the Winnt\Cluster\Cluster_backup folder to your quorum disk resource. For step-by-step instructions about how to restore the contents of this folder to your quorum disk resource, use the Help files that are included with the Clusrest.exe tool. The Clusrest tool is located in Microsoft Windows 2000 Server Resource Kit.
5. Close the command prompt, and then restart the computer. After the computer restarts, the quorum disk resource should be fully restored.
6. After you complete the process, and the Cluster service has successfully started on the newly restored node, restart the other nodes.

If the restore process fails, or if the necessary backups are not available, there are two methods you can use to rebuild the quorum disk resource:

• Restart the Cluster service as "clussvc ûdebug ûresetquorumlog"
• Follow the instructions in Microsoft Knowledge Base article Q224999, "How to Use the Cluster TMP file to Replace a Damaged Clusdb File" (http://go.microsoft.com/fwlink/?LinkId=3052&ID=224999).

The information in this article applies to:

• Microsoft Exchange Server 2003 Enterprise Edition
• Microsoft Exchange Server 2003 Standard Edition
• Microsoft Windows Small Business Server 2003, Premium Edition
• Microsoft Windows Small Business Server 2003, Standard Edition
• Microsoft Exchange 2000 Server