Managing containers
Containers are any holders that store multiple media volumes on your system. You can also manage containers with Backup, Recovery, and Media Services (BRMS).
Containers typically hold one media pool, although you can
specify any media pool. Using containers adds complexity to your storage
management system and is optional. You can specify that you want to
store media in physical containers at specified locations, and use
these containers to move volumes in the container according to a move
policy.