W dniu 04.06.2020 o 15:46, Lizette Koehler pisze:
Do you have any tools like EASYEXIT? Or ACC? Or BMC Tools (use to be Stop-X37
or PROSMS)?
In ISMF You can set up a class to include dynamic volume count.
In SMS environment we see Seq and VSAM regularly take up to 100's of extents
when a dataset is poorly allocated.
Do you use SMS for these datasets?
Do you work with your users on how to properly allocate a dataset?
My rule of thumb is small Primary and large Secondary with RLSE where possible.
Lizette
My advice for typical PS datasets:
1. Use Extended Format - that gives you 123 extents (per volume) and
other features.
2. Use DVC - that gives you n*123 volumes. It also give yet another
chance when the volume is full. And it is easy to change, not like
static mult-vol.
3. Use Space Constraint Relief with Reduce Space Up To.
4. Use zEDC compression whenever possible.
5. Obviously use DFSMS.
6. Be generous when specifying secondary space. First extent should be
sufficient, so secondary means a mistake in calculation.
7. Run some tool (it may be your own) for reporting datasets with
multiple extents. Fix it (consolidate space) and investigate the reasons.
8. Sleep safe. B37 is not your nightmare.
--
Radoslaw Skorupka
Lodz, Poland
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