Welcome to DFSMShsm

DFSMShsm is a functional component of the DFSMS family, which provides facilities for managing your storage devices. DFSMShsm is a DASD storage management and productivity tool for managing low-activity and inactive data. It relieves you from manual storage management tasks and improves DASD use by automatically managing both space and data availability in a storage hierarchy. DFSMShsm cooperates with the other products in the DFSMSdfp family to provide efficient and effective storage management.

DFSMSdfp provides a storage management subsystem (SMS) that allows storage administrators to control the use of storage. The storage management subsystem provides storage groups, storage classes, management classes, and data classes that control the allocation parameters and management attributes of data sets. DFSMShsm performs space management and availability management of each data set as directed by the management class attributes of that data set. In addition, the storage group controls the allocation of the data set when DFSMShsm returns the data set to level 0 (L0) storage.