You can set up migration thresholds for sequential-access storage pools. Migrating data from one sequential-access storage pool to another might be appropriate in some cases, for example, when you install a tape drive that uses a different type of tape and want to move data to that tape.
You probably will not want the server to migrate sequential-access storage pools on a regular basis. An operation such as tape-to-tape migration has limited benefits compared to disk-to-tape migration, and requires at least two tape drives.
You can migrate data from a sequential-access storage pool only to another sequential-access storage pool. You cannot migrate data from a sequential-access storage pool to a disk storage pool. If you need to move data from a sequential-access storage pool to a disk storage pool, use the MOVE DATA command. For more information, see Moving data from one volume to another volume.
To control the migration process, set migration thresholds and migration delays for each storage pool using the DEFINE STGPOOL and UPDATE STGPOOL commands. You can also specify multiple concurrent migration processes to better use your available tape drives or FILE volumes. (For details, see Specifying multiple concurrent migration processes.) Using the MIGRATE STGPOOL command, you can control the duration of the migration process and whether reclamation is attempted prior to migration. For additional information, see Starting migration manually or in a schedule.