I'm curious about something. I believe the z/900, which I'm sure can be
bought fairly cheaply on the open market, has multiple engines that can be
turned on or off by IBM. What if you buy a 3 engine machine, and 6 months
later you need 5 engines. I'm sure if you pay IBM to upgrade the box, that
you will probably pay more than if you just scrap the 3 engine box and buy a
5 engine one. Is that correct? I know the z/800 works that way, but I
think that only IBM can actually do the upgrade.
Eric Bielefeld
Sr. z/OS Systems Programmer
Milwaukee Wisconsin
414-475-7434
----- Original Message -----
From: "Brian Westerman" <[EMAIL PROTECTED]>
Newsgroups: bit.listserv.ibm-main
To: <IBM-MAIN@BAMA.UA.EDU>
Sent: Saturday, June 10, 2006 12:29 AM
Subject: Re: One or two CPUs - the pros & cons
The proper, (and probably cheaper) answer to this problem is to add
another
smaller CPU to the mix, if you have only 2 CPUs, CICS can't really take
advantage of all of the processor complex as it could. It's almost
certainly cheaper to add more engines than to upgrade, unless you have an
older box or got a really bad deal. Depending on the box, you can pick up
CPU's on the 3rd party market for almost laughably small prices.
In this case, costs should drive your decisions, not misplaced estimates
of
capacity. Do you really have individual CICS tranactions that exceed 50
mips? Probably not, and it could be just a matter of tuning what you
have.
It always surprises me that a lot of sites think upgrade before tune, (not
that you're one of them), but I realize that IBM is a big proponent of the
upgrade instead of tune philosophy. :)
Brian
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