Thread: JCL and JCL Utilities

KSDS reorg - how many CI splits before you bother?

Started by Val • user4 replies191 viewsLast activity 1 month ago
Post #1
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Val
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Posted: May 21, 2026, 1:18 PM

Ops wants thresholds for when to REPRO a big KSDS versus leaving it alone. LISTCAT shows CI and CA splits climbing on a few hot files.

I have heard reorg can make things worse if splits happened for a reason. What rules do you use?

Post #2
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Bill
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Posted: May 21, 2026, 6:18 PM

We track splits plus elapsed time on the key paths. Blind reorg just because LISTCAT looks ugly burned us. FreESPACE on define matters more than constant REPRO.

Post #3
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Jen
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Posted: May 22, 2026, 4:18 PM

If inserts land in the same key range every day, splits are doing their job. Reorg removes that space and you split again next week.

Post #4
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Val
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Posted: May 23, 2026, 8:18 PM

Fair point. Pushing back on the weekly reorg cron for two files.

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