IBM OS/390 User Manual
24.2 DFSMSdss - OS/390 Component
DFSMSdss has four functions to help you manage your DASD space:
•
COMPRESS
Compresses your partitioned data sets by taking unused space and
consolidating it at the end of the data set. To make the unused space
available for other data sets, you must use the RELEASE command. This
does not apply to PDSEs.
consolidating it at the end of the data set. To make the unused space
available for other data sets, you must use the RELEASE command. This
does not apply to PDSEs.
•
RELEASE
Releases the unused space in sequential and partitioned data sets for use by
other data sets.
other data sets.
•
DEFRAG
Consolidates the free space on a volume to help prevent out-of-space
abends on new allocations.
abends on new allocations.
•
DUMP/RESTORE
Deletes unwanted data sets and combines data set extents. (The COPY
command can also be used to combine data set extents.)
command can also be used to combine data set extents.)
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