Hello,
Device pools can consist of standalone drives, drives in single or multiple drive robotic libraries, fixed backup-to-disk folders, and removable backup-to-disk devices. Creating drive pools overcomes the limitation that arises when using the same drives individually.
Note: Tape drives that are in a cascaded drive pool are not available to be placed in another device pool unless they are deleted from the cascaded drive pool first.
A drive pool is a collection of multiple tape drives in a single pool. When a drive pool is created using multiple drives, a single virtual device (Pool 1 in this case) is formed. Targeting a job to this drive pool (Pool1) rather than targeting the job to an individual device will provide fault tolerance and maximize hardware efficiency.
Thank You,
Shweta