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  3. October 2009

Re: Performance modeling

Nathan Andelin wrote:
Why not just estimate, based on the CPW ratings for the respective servers?

Well lets take ANY AS/400/iSeries/i5/Power6 system. They all have a published CPW . Now here's a specific example I was give by IBM. To obtain the 4300CPW rating on a Blade IBM needed to use 80+ 15K rpm disks and ( I forget if it was 16GB or more Memory ). IBM told all the BPs Not To Sell CPW starting with the 9406-Mxx and Power6 Systems because unless you have a lot of memory and a largely memory resident job 'you ain't going to see no 4300 CPW' ( my words - not IBM's ) without lots of arms. CPW numbers are listed as Unconstrained ( meaning not I/O Bound ).

So will a 4300 CPW box run faster than a 1000CPW box. Sure, will it run 4 times faster? Maybe then again Maybe Not.



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