Managing Space

Allocation algorithms and the frequent creation, extension, and deletion of data sets cause free space fragmentation on DASD volumes. The result is an inefficient use of DASD space, an increase in space-related abends (abnormal endings), and degraded performance.

With DFSMSdss, you can effectively manage space by reducing or eliminating free-space fragmentation. DFSMSdss provides features that help you perform the following space management tasks:

Compress partitioned data sets.
Release unused space in physical sequential, PDSs, PDSEs, and extended-format VSAM data sets.
Consolidate free space on DASD volumes.