About NetBackup clustering
Clusters provide high availability of applications and data to users. In a cluster, two or more servers (called nodes) are linked in a network. These servers run the cluster software that allows each node access to the shared disks. If a node becomes unavailable, cluster resources migrate to an available node (this process is called failover). The shared disks and the virtual server are kept available. During failover, users experience only a short interruption in service.
In this documentation, the various cluster solutions are abbreviated as follows:
Windows Server Failover Clustering as WSFC
Veritas Volume Manager as Volume Manager
Veritas Cluster Server as VCS
HP MC/Service Guard as Service Guard
IBM's High Availability Cluster Multiprocessing as PowerHA