If you send a backup of a database directly to tape, then it will go faster than disk if they are large files (most of the time they are). We setup a disk pool with 0 min and 0 max on the migration, with the next pool being tape.
Specific command entries are used when you back up DB2® databases. The following table summarizes the commands that are associated with backing up DB2 databases according to the various database configurations and corresponding backup types. Table 1.