The following defines common cluster terms.
The node that owns all shared disk resources during backup.
A node that does not own any shared disk resources during backup.
A shared disk used to store cluster configuration database checkpoints and log files that help manage the cluster. This disk is critical to restore the cluster service. The failure of the quorum disk causes the entire cluster to fail.
A shared disk used to store shared resources including data, database, and application information. These disks are used in the typical fail-over scenario so that the data on the non-quorum shared disks information is always available. The failure of the non-quorum disk does not, in general, cause the entire cluster to fail.
A specific type of shared disk. In a partial shared disk configuration, shared disks can have a unique, one-to-one relationship with individual nodes. Some shared disks are owned by one node and some disks are owned by another node during backup.
The following diagram illustrates a typical two-node cluster setting:
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