A newly designed and implemented automated storage hierarchy management system that operates under MVS is described. The needs for economical archival storage that at the same times makes possible the efficient retrieval of users' data are reviewed. Discussed in detail is the fulfillment of this requirement that is provided by the automated management of MVS/TSO on-line data storage space that includes the Mass Storage System (MSS) and other storage devices in a hierarchy. Experience with the system is summarized.
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