The first thing you have to determine is the breakout of the DASD RT. What
is the RT and how much of it is due to connect vs. disc vs. IOSQ vs. pend.
From there you can start understanding if you have an I/O RT problem and
what might be causing it.
Joel Wolpert
Performance and Capacity Planning consultant
WEBSITE: www.perfconsultant.com
----- Original Message -----
From: "Lizette Koehler" <stars...@mindspring.com>
Newsgroups: bit.listserv.ibm-main
To: <IBM-MAIN@bama.ua.edu>
Sent: Wednesday, July 21, 2010 12:39 PM
Subject: Any ROT for DASD Response time
We are running an EMC DMX4500 shared with the open system side. MVS has
9TB and the open side has 500TB. So they win.
We have points in time where our production application (DB2 Stored
Procedures with Native SQL) has slow responses.
The DBAs are using RMF and TMON (DB2 and MVS) to isolate the problem.
However, they see DFHSM and say thats the problem.
I think I am seeing delays on the dasd the DB2 system uses in RMF. But I
am not sure how to interpret the numbers.
Is there a ROT that says if the delay rate is > ? then the dasd is poor
performaing?
Thanks
Lizette
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