Single Cluster Storage Device

Single Storage Clustering Consulting Services

The quorum resource maintains the cluster configuration data on the single cluster storage device to which all nodes in the cluster are connected. Setup of this model ratifies the Physical Disk resource type (or other storage class resource type). The cluster installation will fail if this resource time does not test true as a viable quorum. This cluster model prescribes the quorum resource maintains all cluster configuration data on a single cluster storage device that all nodes have the potential to control. As mentioned earlier, this is the cluster model available in previous versions of Windows.

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The Quorum Resource

Every cluster requires a resource which is designated as the quorum resource. The idea of the quorum is to provide a place to store configuration data for the cluster. Thus, when a cluster node fails, the quorum lives to service the new active node (or nodes) in the cluster. The quorum essentially maintains the configuration data the cluster needs to recover. This data in the quorum is saved in the form of recovery logs. These logs store the changes that have been saved in the cluster database. Each node in the cluster depends on the data in the cluster database for configuration and state.

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Single Clustering and Cluster Database

A single cluster cannot exist without the cluster database. For example, a cluster is created when each node that joins the cluster updates its private copy of the cluster database. When you add a node to the existing cluster, the Cluster service retrieves data from the other active nodes and uses it to expand the cluster. When you create the first node in a cluster, the creation process updates the cluster database with details about the new node. The quorum resource is also used by the cluster service to ensure the cluster is composed of an active collection of communicating nodes. If the nodes in the cluster can communicate normally with each other (across the cluster interconnect), then you have a cluster. Like all service databases on the Windows platform, the cluster database and the quorum resource logs can become corrupt.

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