Volume Any individual bit of media - tape, OPTICAL disk, etc.

Volume Pool: A logical grouping of volumes to be USED for a specific application. For instance, Oracle backs up to a certain pool, the OS to a different pool, and product code to a third pool.

Volume Group: A logical grouping of volumes based on physical location. Whereas the pool is used for actual DATA, the group is used for administrative work. If you wanted to move all the volumes from one robot to another, you can EITHER move the volumes one at a time or, if they're all in the same group, move the group.

Volume Any individual bit of media - tape, optical disk, etc.

Volume Pool: A logical grouping of volumes to be used for a specific application. For instance, Oracle backs up to a certain pool, the OS to a different pool, and product code to a third pool.

Volume Group: A logical grouping of volumes based on physical location. Whereas the pool is used for actual data, the group is used for administrative work. If you wanted to move all the volumes from one robot to another, you can either move the volumes one at a time or, if they're all in the same group, move the group.