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Consolidating free space and extents on volumes z/OS DFSMSdss Storage Administration SC23-6868-01 |
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Because of the nature of allocation
algorithms and the frequent
creation, extension, and deletion of data sets, free space on DASD
volumes becomes fragmented. This results in:
With the DEFRAG command, you can consolidate the free space on volumes and avoid this problem. The DEFRAG command relocates data set extents on a DASD volume to reduce or eliminate freespace fragmentation, and prints a report about free space and other volume statistics. Also, you can specify which data sets, if any, are to be excluded from data-set-extent relocation. Data set extents are not combined as a result of DEFRAG processing. Note: Data set extents will not be moved
between the track-managed space and cylinder-managed space of an extended
address volume during DEFRAG processing.
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