In addition to the resource groups created for each clustered application, a cluster always has a resource group to represent the quorum of the cluster. This resource group, by default named Cluster Group, is created when the cluster is created. In a shared disk quorum, the disk containing the quorum resource is called the quorum disk, and it must be a member of the default Cluster Group. A quorum disk is used to store cluster configuration database checkpoints and log files which help manage the cluster as well as maintain consistency. The quorum resource is used to decide which nodes of the cluster are supposed to form the cluster. Because the cluster configuration is kept on a quorum disk resource, all nodes in the cluster must be able to access and communicate with the node that owns it.
Note: Quorum Disks apply to only Microsoft Cluster Server (MSCS) environments.
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