Hi Alex,
You should combine the DASD response time with I/O rate when you check your
DASD's performance.
And see how is the I/O intensity during your batch window..
On Wed, Aug 10, 2011 at 5:39 AM, Hal Merritt hmerr...@jackhenry.com wrote:
In modern DASD, 3390-3, 3390-9, 3390-whatever are just logical constructs.
More, hopefully most all of the I/O looks like it is directed to a volume,
but actually is satisfied in cache or buffers and never really touches the
physical disk.
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On
Behalf Of Alex Wang
Sent: Tuesday, August 09, 2011 5:02 AM
To: IBM-MAIN@bama.ua.edu
Subject: IOPS benchmark
Hi All,
We are now evluating the IOPS for some DASD (3390-3 and 3390-9). Because
the DASD are shared by all LPARs in the sysplex. As per RMF IO activity,
there are a few DASDs which were accessed 2000 per second at a specific
time. We are afraid there may be hotpot problem occur in the near future.
Is there any reference which clearly states the benchmark or thredhold for
the IBM DASD (3390-3 and 3390-9)? The DASD IOPS may be 300 at a specific
time in the sysplex. Is it acceptable or do we need to tune that DASD?
Looking forward to hearing from you. Thanks!
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Cobe Xu
Best Regards
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z/OS Performance Capacity Analyst
z/OS System Programmer
Email: cob...@gmail.com
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