Re: Degraded I/O performance in 1.10?

Herman,

Thanks for the response. The files in question are VSAM. I will
re-check the migration guide for info.

_________________________________________________________________
Dave Jousma
Assistant Vice President, Mainframe Services
david.jousma@xxxxxx
1830 East Paris, Grand Rapids, MI 49546 MD RSCB1G
p 616.653.8429
f 616.653.8497


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxx] On
Behalf Of Stocker, Herman
Sent: Thursday, August 13, 2009 1:13 PM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: Degraded I/O performance in 1.10?

Hi David,

Look into increasing the buffers VSAM index. Some catalog changes have
occurred that may be the cause of your slow response. Also SMF and
Logrec
buffering.

Regards,
Herman Stocker
-------< snip>-------
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
-------</snip>-------


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