On 21/03/2016 9:54 PM, John McKown wrote:
On Mon, Mar 21, 2016 at 8:14 AM, R.S. <[email protected]>
wrote:
Well,
I observed 1,3M IOPS on EC12 or z196 machine during WAS installation. With
minimal CPU utilisation (I mean regular CPU, I haven't checked SAP).
IMNSHO a PC server with collection of new shining Emulex cards has waaaay
worse I/O capabilities.
We did some tests of database operations on PC. Effects are unequivocal.
BTW: Typical z/OS I/O workload is very different from PC workload. Much
less IOPS, much more data, much less CPU%.
Just relating a story my boss tells. A major U.S. manufacturer decide to
move all their z/OS work to a SAP distributed platform. A daily job, which
was basically did all the shipping work, ran over a day on the SAP platform
(remember, daily job). On the z/OS system, it runs 45 minutes. So they have
one, very old, IBM mainframe (don't remember what) which they IPL daily to
run this one job, then shut back down until the next day. This is, indeed,
"hearsay". But I trust my boss when he says that it is so.
My wife worked on a couple of mainframe to SAP migration projects and I
can't recall any performance war
stories but they were not big shops. I do recall that the customers had
to change their work processes to fit
around SAP and not the other way round, which is bad!
--
Radoslaw Skorupka
Lodz, Poland
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
