Some troubleshooting for Microsoft Cluster (MSCS)
Cluster Admin cannot connect to the Cluster
- Instead of connect to your cluster using VIRTUAL_HOSTNAME, you may try to connect using "." (a single dot), which means "itself".
Forcing Quorum (What to Do If You Lose
Quorum)
“the secondary site can be
forced to continue even though the cluster software believes it does not have
quorum. This is known as forcing quorum.”
1. Stop Cluster service on ALL
nodes using Cluster Admin
2. One must decide which node
to be the Active Node. Let’s use assume Node X as an example.
3. Setup ForceQuorum registry
key node X:
a. HKLM\SYSTEM\CurrentControlSet\Services\ClusSvc\Parameters
b. Add a new REG_SZ key
“ForceQuorum” and the value should be “NodeX” (without quotes).
4. Start Cluster service on
Node X.
Back to Normal
1. Turn on the other node.
2. Stop Cluster Service on all
node
3. Remove registry key setting
made before.
4. Startup the Cluster Service
on Node X again.
5. Boot the other node.
How to Change Quorum Disk
Designation (KB 280353)
Spilt Brain scenario – loss
of communication between the nodes (RVD case)
To designate another quorum
disk
1. Start Cluster
Administrator (CluAdmin.exe).
2. Right-click the
cluster name in the upper-left corner, and then click Properties.
3. Click the Quorum tab.
4. In the Quorum
resource box, click a different disk resource.
5. If the disk has
more than one partition, click the partition where you want the
cluster-specific data to be kept, and then click OK.
NOTE: If you cannot start
Cluster service because the quorum disk is unavailable, use the /FIXQUORUM switch
to start Cluster service. You are then able to change the quorum disk
designation.
When you change the quorum disk designation, Cluster service does not remove the /Mscs directory from the old drive. For administrative purposes, you may want to delete this old directory, or keep it as a backup. Do not continue running Cluster service with the /FIXQUORUM switch enabled. When the new quorum disk is established, stop the service and restart it without a switch. Then it is safe to bring other nodes online.
When you change the quorum disk designation, Cluster service does not remove the /Mscs directory from the old drive. For administrative purposes, you may want to delete this old directory, or keep it as a backup. Do not continue running Cluster service with the /FIXQUORUM switch enabled. When the new quorum disk is established, stop the service and restart it without a switch. Then it is safe to bring other nodes online.
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