Benyamin Dissen wrote:

> I would expect unless you have a huge amount of memory 
> and a very quiet system that all real memory will be
> in use in some way.

I've run into a number of situations where dumps have stressed memory. In 
the worst cases dumping has stressed aux, too.

I've also looked at lots of customer systems and in my experience the 
memory situation varies very widely - from the tens of gigabytes unused on 
an LPAR to the extremely overcommitted during dumping - and many points in 
between. I would say that a "high robustness in the face of dumping" 
stance is an entirely valid one but one that requires provisioning to and 
beyond the peak dumping memory requirement. (And so it might be (or 
appear) unaffordable.)

It's a stance an installation has to take for themselves - and so I don't 
get judgemental about it... I merely point out the dynamics. :-)

Martin

Martin Packer,
Mainframe Performance Consultant, zChampion
Worldwide Banking Center of Excellence, IBM

+44-7802-245-584

email: [email protected]

Twitter / Facebook IDs: MartinPacker





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