If you have data on your DASD that you do not use very often, DFSMShsm can automatically move that data to slower and cheaper devices. For example, DFSMShsm can move your low-activity data sets onto slower DASD or tape volumes. DFSMShsm saves on storage costs by automatically compacting or compressing your low-activity data. You can use OAM to move your low-activity objects onto slower access media such as tape or optical volumes.