Discussion:
IDCAMS REPRO very slow on z/OS 2.3
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Frank Swarbrick
2018-06-12 15:51:13 UTC
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We just upgraded from z/OS 2.2 to z/OS 2.3 on Sunday morning. This appears to cause IDCAMS REPRO jobsteps to do a lot more I/O and take a lot longer:


PROCSTEP RC EXCP CONN TCB SRB CLOCK SERV RECORDS PROCESSED

CPCOPY3 00 255K 929K 2.658683 0.159647 15.5 3103515 52662441

CPCOPY3 00 256K 967K 2.679822 0.186634 16.9 3156197 52760628

CPCOPY3 00 256K 1014K 2.693045 0.191031 17.6 3175500 52812944

CPCOPY3 00 257K 1071K 2.698492 0.190811 18.7 3181257 52834640

CPCOPY3 00 257K 1014K 2.706506 0.195671 18.0 3195359 52842738

CPCOPY3 00 258K 909K 2.687564 0.163270 16.3 3139318 52852559

After z/OS v2.3 implementation:

CPCOPY3 00 18M 2363K 6.493965 1.100855 101.3 10081297 52859452

CPCOPY3 00 18M 2406K 6.123753 1.018400 100.5 9588445 52888383

So from 15-20 minutes for 5.2 million records to 100 minutes. Anyone know of a system level "tuning" parameter we might need to tweek?

Thanks,
Frank

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Lizette Koehler
2018-06-12 15:55:56 UTC
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I would open an SR - you may have found a "new" behavior

Lizette
-----Original Message-----
Frank Swarbrick
Sent: Tuesday, June 12, 2018 8:51 AM
Subject: IDCAMS REPRO very slow on z/OS 2.3
We just upgraded from z/OS 2.2 to z/OS 2.3 on Sunday morning. This appears
PROCSTEP RC EXCP CONN TCB SRB CLOCK SERV RECORDS PROCESSED
CPCOPY3 00 255K 929K 2.658683 0.159647 15.5 3103515 52662441
CPCOPY3 00 256K 967K 2.679822 0.186634 16.9 3156197 52760628
CPCOPY3 00 256K 1014K 2.693045 0.191031 17.6 3175500 52812944
CPCOPY3 00 257K 1071K 2.698492 0.190811 18.7 3181257 52834640
CPCOPY3 00 257K 1014K 2.706506 0.195671 18.0 3195359 52842738
CPCOPY3 00 258K 909K 2.687564 0.163270 16.3 3139318 52852559
CPCOPY3 00 18M 2363K 6.493965 1.100855 101.3 10081297 52859452
CPCOPY3 00 18M 2406K 6.123753 1.018400 100.5 9588445 52888383
So from 15-20 minutes for 5.2 million records to 100 minutes. Anyone know of
a system level "tuning" parameter we might need to tweek?
Thanks,
Frank
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Sri h Kolusu
2018-06-12 16:10:21 UTC
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Frank,


Please make sure that you have OA54007 installed.

http://www-01.ibm.com/support/docview.wss?uid=isg1OA54007

Thanks,
Kolusu
Date: 06/12/2018 08:51 AM
Subject: IDCAMS REPRO very slow on z/OS 2.3
We just upgraded from z/OS 2.2 to z/OS 2.3 on Sunday morning. This
appears to cause IDCAMS REPRO jobsteps to do a lot more I/O and take
PROCSTEP RC EXCP CONN TCB SRB CLOCK SERV
RECORDS PROCESSED
CPCOPY3 00 255K 929K 2.658683 0.159647 15.5 3103515
52662441
CPCOPY3 00 256K 967K 2.679822 0.186634 16.9 3156197
52760628
CPCOPY3 00 256K 1014K 2.693045 0.191031 17.6 3175500
52812944
CPCOPY3 00 257K 1071K 2.698492 0.190811 18.7 3181257
52834640
CPCOPY3 00 257K 1014K 2.706506 0.195671 18.0 3195359
52842738
CPCOPY3 00 258K 909K 2.687564 0.163270 16.3 3139318
52852559
CPCOPY3 00 18M 2363K 6.493965 1.100855 101.3 10081297
52859452
CPCOPY3 00 18M 2406K 6.123753 1.018400 100.5 9588445
52888383
So from 15-20 minutes for 5.2 million records to 100 minutes.
Anyone know of a system level "tuning" parameter we might need to tweek?
Thanks,
Frank
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Sri h Kolusu
2018-06-12 16:34:49 UTC
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Sri,
Can you provide any information as to what introduced this error? The
APAR description seems to indicate this was "always there".

Alan,

It is NOT always there, the issue was introduced only in z/OS 2.3. The
error description and problem determination explains the problem.

Thanks,
Kolusu


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Frank Swarbrick
2018-06-12 16:51:18 UTC
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Thanks Sri. I'm having the systems group check on this. I'll try the JCL AMP buffers override to see if I can get around it for now.

Do you know why the APAR says it applies to "Software Version 210" instead of 230?
________________________________
From: IBM Mainframe Discussion List <IBM-***@LISTSERV.UA.EDU> on behalf of Sri h Kolusu <***@US.IBM.COM>
Sent: Tuesday, June 12, 2018 10:34 AM
To: IBM-***@LISTSERV.UA.EDU
Subject: Re: IDCAMS REPRO very slow on z/OS 2.3
Sri,
Can you provide any information as to what introduced this error? The
APAR description seems to indicate this was "always there".

Alan,

It is NOT always there, the issue was introduced only in z/OS 2.3. The
error description and problem determination explains the problem.

Thanks,
Kolusu


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Sri h Kolusu
2018-06-12 17:02:58 UTC
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Post by Frank Swarbrick
Do you know why the APAR says it applies to "Software Version 210" instead of 230?
Frank,

Even though the issue is introduced in z/OS 2.3 , We built PTFs for the
other releases(2.1 and 2.2) to forestall future problems that might have
been exposed by later PTFs

Thanks,
Kolusu


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Frank Swarbrick
2018-06-12 19:26:53 UTC
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The fix for APAR OA54007 was just implemented on our system and has resolved the issue. Great!!
________________________________
From: Frank Swarbrick <***@outlook.com>
Sent: Tuesday, June 12, 2018 9:51 AM
To: ibm-***@listserv.ua.edu
Subject: IDCAMS REPRO very slow on z/OS 2.3

We just upgraded from z/OS 2.2 to z/OS 2.3 on Sunday morning. This appears to cause IDCAMS REPRO jobsteps to do a lot more I/O and take a lot longer:


PROCSTEP RC EXCP CONN TCB SRB CLOCK SERV RECORDS PROCESSED

CPCOPY3 00 255K 929K 2.658683 0.159647 15.5 3103515 52662441

CPCOPY3 00 256K 967K 2.679822 0.186634 16.9 3156197 52760628

CPCOPY3 00 256K 1014K 2.693045 0.191031 17.6 3175500 52812944

CPCOPY3 00 257K 1071K 2.698492 0.190811 18.7 3181257 52834640

CPCOPY3 00 257K 1014K 2.706506 0.195671 18.0 3195359 52842738

CPCOPY3 00 258K 909K 2.687564 0.163270 16.3 3139318 52852559

After z/OS v2.3 implementation:

CPCOPY3 00 18M 2363K 6.493965 1.100855 101.3 10081297 52859452

CPCOPY3 00 18M 2406K 6.123753 1.018400 100.5 9588445 52888383

So from 15-20 minutes for 5.2 million records to 100 minutes. Anyone know of a system level "tuning" parameter we might need to tweek?

Thanks,
Frank

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