I have been thinking about this. And what you said jogged my memory...

In order to get around this problem, way back when, I used a BUFFER length 
keyword and specified 32760 or something like that on the first DD statement. 
Then it didn’t matter which PDS was specified first. 

Regards
Steve Thompson

--- 00000190521b6517-dmarc-requ...@listserv.ua.edu wrote:

From:         Phil Carlyle <00000190521b6517-dmarc-requ...@listserv.ua.edu>
To:           IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: [IBM-MAIN] Crazy concatenation mystery
Date:         Thu, 2 May 2019 14:03:31 +0000

Has anyone checked to see if the order of the JOBLIB/STEPLIB changed.  If the 
first library has the larger BLKSIZE, then smaller subsequent libraries will 
have no impact.
As for LPA, Linklist, etc., these have no bearing on JOBLIB/STEPLIB.  BTW, what 
error is being received?

PHIL CARLYLE
Information Security | IAM RACF directory services
M: 480-235-2837 | phil.carl...@aexp.com<mailto:phil.carl...@aexp.com>
TEKSystems Consultant

"The Universe is made up of Protons, Neutrons, Electrons & Morons!"


From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Arthur
Sent: Wednesday, May 1, 2019 10:09 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Crazy concatenation mystery

On 1 May 2019 16:51:49 -0700, in bit.listserv.ibm-main
(Message-ID:<byapr01mb4166a8133b83117a5201d0a6bf...@byapr01mb4166.prod.exchangelabs.com<mailto:byapr01mb4166a8133b83117a5201d0a6bf...@byapr01mb4166.prod.exchangelabs.com>>)
jesse1.robin...@sce.com<mailto:jesse1.robin...@sce.com> (Jesse 1 Robinson) 
wrote:

>So this is all absolutely true. The module *is* 32760
>while the PDS *is* 19069-the ancient 3350 track size that
>was fairly standard for load libraries in the Dark Ages.
>So what's the mystery? How on earth did the 13 April and
>*all previous* runs work OK? We cannot find any evidence
>of a change. No IPL that weekend let alone z/OS
>maintenance. The link edit date on the fat module is years
>old. We restored an older version of the skinny PDS from
>HSM. No differences. The DASD upgrade I posted about
>earlier came two weeks later.
>
>It should have failed eons ago. This JOBLIB concatenation
>has other problems as well that are not obviously related.

Did the JCL change? Did the blksize of the 1st dataset in
the JOBLIB concatenation change?

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