RE: Sizing CPU

The first reaction is that your situation is political, not technical.
That is, management simply does not want to hear that an upgrade is
needed. There are no numbers that will ever completely satisfy this
situation, except the number of times SLA's are not met.

But this worked once, and it might be worth a shot:

Using a reporting tool such as MXG, evaluate each RMF interval's
utilization.

Set some arbitrary classification rules, such as 0-50, 50-80, 90-98,
98-100.

Now count the number of intervals that fall into each class, and
multiply by the interval duration. You now have the amount of time spend
at these workload levels.

Perhaps you might refine this by looking only at certain times of the
day such as the afternoon peak or the batch window.

So, if you are spending a lot of time in the 98-100 class, then an
upgrade might be unavoidable. If, on the other hand, you are spending
little or no time in the 98-100 class, then you would have to look
elsewhere for performance opportunities.

HTH and good luck.


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxxx
Behalf Of Guy Gates
Sent: Tuesday, May 01, 2007 5:06 PM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Sizing CPU

Hello,

I am running a Z890 with 5 LPARS (3 Production, 1 Test and 1 SysProg).
I
need to get some Peak CPU numbers to determine if/when I need a New
Processor. I can only seem to get Averages and my Management is not
happy
with those numbers. What are others that are running multiple LPARs on a

Single Processor doing to get these numbers?
We converted from VSE to z/OS about 2 years ago and they were able to
get
these kinds of numbers from Explorer under VSE.
I am not a Performance or Capacity Person and only have SYSVIEW, RMF
and
SMF to get this information from. Can anyone help me?

Thanks,
Guy Gates
TTI System Programmer II

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