Sysparm IOTRACKS also affects PDS directory processing. Tests have also shown that for directories in the range of one track or less (which is 46 directory blocks or less on a 3380), setting IOTRACKS to 1 can improve performance. If tests verify this in your environment, supply this value as a permanent sysparm override to the PDS Compress function.
Previous recommendations to exclude SMP/E data sets still being kept as PDSs (rather than VSAM data sets) are no longer applicable. The revisions allow all partitioned data sets to be processed equally well.
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