You can use DFSMShsm to keep DASD space available. DFSMShsm can automatically and periodically move low activity data sets from user DASD volumes to DFSMShsm-owned volumes. DFSMShsm also reduces the space occupied by data on both the user DASD volumes and the DFSMShsm-owned volumes.

To provide you with more control, daily space management is divided into automatic primary and automatic secondary space management functions. Each of these functions can have a processing cycle. Each can be started at a specified time of day and end when all data that is managed by DFSMShsm is processed, or end when the ending time of day (storage administrator specified) is reached.