We tripped over something with z/OS 2.1 maintenance and volcounts. These are some notes I have:
With z/OS 2.1, an enhancement to DFSMS came in which meant that when a dataset (tape in this case) filled 5 volumes, DFSMS automatically created the additional control blocks to extend by another 5 tapes...and then another and so on
Until we applied maintenance to z/OS 2.1, that happened regardless of the VOL,,,x parameter in JCL or in the DATACLAS, After, the system now honours the VOL,,,x parameter or what's in the DATACLAS (and I think the DATACLAS overrides the JCL). A selection of DATACLAS's had VOLCOUNT=1 set (which really means 5 vols), and this caused us some abends.
We raised a PMR with IBM, and one part of the dialogue went:
There was a RAS enhancement to eliminate ABEND837-08 for tape data
sets introduced by APAR= OA46493.
This APAR also has a detailed description how the VOLCNT allocation
z/Series System Programmer
From: IBM Mainframe Discussion List [mailto:IBM-***@LISTSERV.UA.EDU] On Behalf Of Beesley, Paul
Sent: 09 October 2018 13:54
Subject: z/OS 2.3 and VOLCOUNT
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Did something change with VOLCOUNT parameter handling between z/OS 2.1 and 2.3?
We have a job that uses 21 tapes to backup an application's datasets, and has this parameter: VOL=(,RETAIN,,20),
Following the upgrade to 2.3 at the weekend, this job failed S837-08, indicating it has run out of tape volumes, which is quite correct.
However, looking back at the previous runs, they all have used 21 tapes. So they should really have abended as well, but all worked ok.
Hence, wondering if something has changed in volume count processing, or whether there was a bug in 2.1 which was fixed in 2.3.
Would appreciate any suggestions before I face the Spanish inquisition who are claiming that my upgrade broke their job.
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