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  3. April 2009

Re: Measure CPW used

Mark S. Waterbury wrote on Mon, 27 Apr 2009 19:29:31 GMT:

Also, if you read the "fine
print" you will see that IBM specifically states that CPW
ratings were obtained on "a maximally configured" system --
this means a system with the absolute maximum amount of disk,
cache, IOPs/IOAs, and main storage. Only the very largest IBM
customers will ever come close to having such a configuration.

Well, maximally configured has different meanings to different
folks ....

Is the maximum memory for a given model used? Yes.

Is the absolute maximum disk used? Not necessarily. Although it
used to be.

I would disagree that only the largest customers can come close
to having configurations that match what is used to develop CPW
ratings. There are probably many 550 (and 520) customers that
may not have the same amount of main storage (memory) but much
more disk.


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