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Before you can uninstall Cluster Server from a node, perform the following steps:

1.Take all resource groups off-line or move them to the other node.

2.Evict the node from the cluster by right-clicking the node icon in Cluster Administrator and selecting Evict Node from the menu.

3.Close Cluster Administrator on the node.

4.Stop the Cluster Service running on the node.

5.Uninstall Microsoft Cluster Server using the Add/Remove Programs utility in the Control Panel.

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When removing a node from a cluster, you must power down the node before remov- ing any of the cluster cabling. Likewise, when rejoining a node to a cluster, attach all cables before starting the node.

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A quorum resource is typically a hard-disk drive in the shared storage subsystem that serves the following two purposes in a cluster system:

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Acts as an arbiter between the two nodes to ensure that the specific data neces- sary for system recovery is maintained consistently across the nodes

Logs the recovery data sent by the nodes

Only one node can control the quorum resource at one time, and it is that node that remains running when the two nodes are unable to communicate with each other. Once the two nodes are unable to communicate, the Cluster Service automatically shuts down the node that does not own the quorum resource.

With one of the nodes shut down, changes to the cluster configuration database are logged to the quorum disk. The purpose of this logging is to ensure that the node that gains control of the quorum disk has access to an up-to-date version of the cluster configuration database.

Configuring the Cluster Software 3-13