also, as some very wise people on this list and other lists/papers have
pointed out Know thy data some of our worst dasd response time issues were
eliminated by simply looking at the logical volume placement and the data
sets there on. Moving some DB2 indexes into different array groups and/or
off
that lead to the elongated seek affect that you describe.
Ron
-Original Message-
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On
Behalf Of
J Ellis
Sent: Thursday, July 29, 2010 4:47 AM
To: IBM-MAIN@bama.ua.edu
Subject: Re: [IBM-MAIN] Any ROT for DASD Response time
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
ron.hawkins1...@sbcglobal.net
Newsgroups: bit.listserv.ibm-main
To: IBM-MAIN@bama.ua.edu
Sent: Thursday, July 29, 2010 11:59 AM
Subject: Re: Any ROT for DASD Response time
J,
This is what Pat describes as SIBLING PEND and it is easy to spot the
symptom because it shows up as Disconnect Time.
I sure
Of
Joel Wolpert
Sent: Thursday, July 29, 2010 2:37 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: [IBM-MAIN] Any ROT for DASD Response time
Disconnect time can also show up as synchronous remote copy (SRDF). If the
links are saturated it will elongate the DISC time and therefore the RT.
Joel
Response time
See imbedded.
Hal
-Original Message-
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of
Ron Hawkins
Sent: Thursday, July 22, 2010 10:54 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Any ROT for DASD Response time
Hal,
I should have
See imbedded.
Hal
-Original Message-
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of
Ron Hawkins
Sent: Thursday, July 22, 2010 10:54 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Any ROT for DASD Response time
Hal,
I should have been clear. The statement I
to consider. But
that does not address the OP's question.
-Original Message-
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of
Ron Hawkins
Sent: Wednesday, July 21, 2010 11:29 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Any ROT for DASD Response time
Hal
Ask the DBA's why they say thats DFHSM causing the delay, are there
recalls necessary for DB2 work ?
What kind of delays do you see on the dasd volumes. What is causing the main
delay according to RMF monitor 3 ?
2010/7/21 Lizette Koehler stars...@mindspring.com
We are running an EMC DMX4500
ROT is not important now, the main problem you are having a performance
problem and not meeting your SLA's. Important is to identify what is causing
that problem.
2010/7/21 Lizette Koehler stars...@mindspring.com
We are running an EMC DMX4500 shared with the open system side. MVS has
9TB and
up as a delay unless there is contention.
Ron
-Original Message-
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of
Hal Merritt
Sent: Thursday, July 22, 2010 7:49 AM
To: IBM-MAIN@bama.ua.edu
Subject: Re: [IBM-MAIN] Any ROT for DASD Response time
Short
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
and good luck.
-Original Message-
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of
Lizette Koehler
Sent: Wednesday, July 21, 2010 11:39 AM
To: IBM-MAIN@bama.ua.edu
Subject: Any ROT for DASD Response time
We are running an EMC DMX4500 shared with the open
Your DBA's are not even close. Unless the DB2 address spaces are waiting for
DFHSM services(unlikely), faggedabouditt!
Your normal tuning should insulate DB2 from any vagaries of DFHSM processing.
IMO the most likely cause (if there is DASD interference) would be in the
cache. I don't know if
09:39
To: IBM-MAIN@bama.ua.edu
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
On Wed, 21 Jul 2010 12:36:38 -0500, Staller, Allan allan.stal...@kbm1.com
wrote:
I don't know if EMC has the ability to fence the cache for workload separation
(open systems vs. z/OS).
That would be a no. We now live happily together here again on a VMAX.
Once upon a time in Symmetrix land
YMMV!
snip
That would be a no. We now live happily together here again on a
VMAX.
Once upon a time in Symmetrix land we tried having both on the same box,
but the technology just didn't live up to it's billing. We went to
seperate
boxes until March of this year, where management saw it fit
In this context a ROT for any delay would be zero, IMHO.
That, of course, is totally unrealistic.
2-5ms/IO is reasonable, IMO.
-
I'm a SuperHero with neither powers, nor motivation!
Kimota!
--
For IBM-MAIN subscribe / signoff
In a message dated 7/21/2010 3:02:23 P.M. Central Daylight Time,
eamacn...@yahoo.ca writes:
That, of course, is totally unrealistic.
2-5ms/IO is reasonable, IMO.
The folks over at _www.perfassoc.com_ (http://www.perfassoc.com) do this
for a living. They got White Papers on different
The folks over at _www.perfassoc.com_ (http://www.perfassoc.com) do this
for a living.
Yes, I know that.
But, I was responding to the poster who said delay had to be ZERO.
IMPOSSIBLE!
-
I'm a SuperHero with neither powers, nor motivation!
Kimota!
Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of
Hal Merritt
Sent: Wednesday, July 21, 2010 10:32 AM
To: IBM-MAIN@bama.ua.edu
Subject: Re: [IBM-MAIN] Any ROT for DASD Response time
Point is that you are not meeting your SLA goals. If DASD response time is an
issue, then it can be described
[mailto:ibm-m...@bama.ua.edu] On
Behalf Of
Ed Finnell
Sent: Wednesday, July 21, 2010 8:29 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: [IBM-MAIN] Any ROT for DASD Response time
In a message dated 7/21/2010 3:02:23 P.M. Central Daylight Time,
eamacn...@yahoo.ca writes:
That, of course
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