3.1.1.5 Resource Types

The cluster state, as specified in section 3.1.1, is typically configured by default with several resource types; however, the configured resource types can be modified by implementation-specific methods between servers. For information about the default resource types in the cluster state, see [MSDN-CLUSRESTYPES].

The cluster state includes a resource type that allows alternate IP addresses to be instantiated on a server. A cluster supports a resource type that allows an alternate computer name to be instantiated as an endpoint with which client applications can make authenticated connections. The cluster typically maintains a security principal that is based on the primary cluster name and is made available to services, applications, and resources within the cluster.

The cluster state also includes a resource type that allows storage to be replicated.<53> Storage replication occurs from a volume on a source disk to a volume on a target disk. Multiple source disks can be aggregated in the same replication group and replicated together to a corresponding aggregation of target disks. Storage replication typically uses a log disk associated with the source disks and a log disk associated with the target disks to maintain replication data. Each of these disks is represented by a storage class resource in the cluster state. The mechanisms to replicate storage, to aggregate disks into replication groups, and to determine eligibility of storage class resources for replication are implementation-specific.