W dniu 2011-04-16 10:50, Ken Brick pisze:
The depending answer is 100% correct except when its wrong. :-)
You cannot forecast without knowing the past and it is the that will
tell you whether you need peak or average or more probably a mix.
Hypothetically consider a CEC running at 100% busy. However
simplistically this is a 80/20 split between online (including DBMS) and
batch. The online is peaking at 80 whilst the batch averages 20. If the
forecast is for a 30% increase in online then you probably should be
working of the peak figure moderating it with whatever the batch can
forgo. For a 30% increase in batch the average of 20 could probably be
used.
A highly simplistic arguement that probably wouldn't get a prize in a
Capacity Management/Performance class
Last, but not least: CPU granularity.
You cannot buy 5% CPU more, or 35%, or 41%. You can buy CP, not half of
it. Situation is much better for smaller machines - mix of n-WAY +
subcapacity levels gives you really good granularity. However neither
MSU, nor MIPS should be used for capacity planning beacuse YMMV (IBM words).
So, rough estimations are quite OK here, especially that your business
growth estimates are also rough and are not proportional to CPU
consumtion. Not to mention unplanned, "small" enhancements...
--
Radoslaw Skorupka
Lodz, Poland
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