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You should make several operational decisions when adding devices.
For each device defined to the server, the server creates a storage pool, a collection of media for the device, for each device type detected. Determine the backup device for a client's data when that client is associated with a storage pool.
Tape drive performance often depends on the way that devices are positioned in the storage hierarchy and whether the server is a stand-alone implementation or a networked implementation. A Tivoli Storage Manager server in a stand-alone implementation can go directly to tape to reduce contention for disk resources. Networked Tivoli Storage Manager servers benefit from a storage hierarchy where files are backed up to disk and migrated to tape later. See Chapter 14, Implementing Policies for Client Data and Overview: The Storage Pool Hierarchy.