> On Jun 8, 2017, at 7:49 AM, Peter Relson <rel...@us.ibm.com> wrote:
> ————————————SNIP———————————————————————————

Peter, good answer.
This reminds me a little of something long long ago. Maybe someone here can 
refresh (correct?) my memory.
From the time CICS came out the sysprogs were always seemingly fighting storage 
overlays (if memory serves me).
After 5-8 years?? CICS’s answer was to use different storage keys to isolate 
and prevent storage overlays.
Can someone correct my memory of this, please?

Ed

> Tony H's response was right on target. Using different user-region 
> subpools does nothing to help prevent overwrites or corruption.
> It does help a bit with someone unintentionally freeing the wrong thing.
> Some applications might choose unique subpools to accommodate a subpool 
> freemain.
> 
> Peter Relson
> z/OS Core Technology Design
> 
> 
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