Have you checked RMF to compare CPU usage and I/O performance before and
after the upgrade; specifically the I/O response time. What about the cpu
usage of individual jobs.
----- Original Message -----
From: "Jousma, David" <[email protected]>
Newsgroups: bit.listserv.ibm-main
To: <[email protected]>
Sent: Thursday, August 13, 2009 12:45 PM
Subject: Degraded I/O performance in 1.10?
All,
I realize this is a really open ended question. We completed our 1.8 to
1.10 upgrade in June, with no known problems. Everything seems to be
running fine. However, I have various people(mostly developers)
occasionally complaining that they "think" the system is slower since
the upgrade. Of course, the upgrade gets blamed for everything. By
slower, the are referring to their batch jobs, those that do a lot of
I/O.
Interestingly, several people, who do not work in the same area(and most
likely do not talk to each other), asked if file buffering has changed
somehow with the upgrade. I tell them, not that I am aware of, and ask
them for specifics to research, and in most cases I compare the jobs
running before and after the upgrade, and the EXCPs all seem to be
inline.
So, all I can say is that there is this gut feeling that something isn't
quite right, but can't put a finger on it.
Has anyone else noticed anything, or have idea's on what to look for?
_________________________________________________________________
Dave Jousma
Assistant Vice President, Mainframe Services
[email protected]
1830 East Paris, Grand Rapids, MI 49546 MD RSCB1G
p 616.653.8429
f 616.653.8497
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