A disk pool represents disk volumes on the underlying disk storage. The disk appliance exposes one or more units of storage (disk volumes). NetBackup aggregates that storage into a pool of storage or multiple pools of storage. You then use the disk pool or pools for backups. If the disk appliance exposes multiple disk volumes, you can divide the volumes and assign them to separate disk pools.

A disk pool is the storage destination of a NetBackup storage unit.

When NetBackup sends backup data to a disk pool, NetBackup selects disk volumes based on available capacity and predicted size of the backup. NetBackup tries to write backup data to a single volume. If necessary, backup images span disk volumes in a disk pool. Backup images do not span across multiple disk pools.