About NetBackup on a Veritas Cluster Server on UNIX/Linux
Veritas Cluster Server (VCS) is a high-availability solution for cluster configurations. VCS enables you to monitor systems and application services and to restart services on a different system when hardware or software fails.
NetBackup can be configured in a cluster as a non-failover server and as a standalone media server with virtual storage units. Refer to the NetBackup in Highly Available Environments Administrator's Guide for more information.
https://www.veritas.com/support/en_US/article.DOC5332
NetBackup supports the use of the Global Cluster Option (GCO) with VCS. For information on how to configure and use GCO with NetBackup, refer to the NetBackup in Highly Available Environments Administrator's Guide.