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Abends using up address spaces?


 
IBM Mainframe Forums -> ABENDS & Debugging
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John Poulakos

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Joined: 13 Jun 2012
Posts: 180
Location: United States

PostPosted: Tue Apr 23, 2019 8:34 pm
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We have a systems programmer who says application abends are using up address spaces, so he has to IPL. I have never heard of this before and he isn't very informative. Can anyone explain this to me? I have looked all over the internet and can't find a thing about this.
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enrico-sorichetti

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Joined: 14 Mar 2007
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PostPosted: Tue Apr 23, 2019 8:57 pm
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google with
address space not reusable reason
and you will get a few links whit the explanation
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steve-myers

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Joined: 30 Nov 2013
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PostPosted: Tue Apr 23, 2019 9:10 pm
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Most ordinary ABENDs do not damage an address space, or at least do so little damage they can recover.

I've long had the theory that the storage map in the main part of an address space and/or its LSQA can be damaged, but you should be able to recover that by a $PI and $SI.

What can be difficult is CSA and SQA can be damaged either as really damaged or just storage allocated and never freed. This is a conceptual weakness in the MVS model. Fortunately it's pretty rare, unless you have your applications or vendor applications that screw things up. Finding them can be daunting. THAT pretty much needs an IPL.
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Robert Sample

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Joined: 06 Jun 2008
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Location: Dubuque, Iowa, USA

PostPosted: Tue Apr 23, 2019 10:13 pm
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We use ADABAS and it marks address spaces non reusable when a database is brought down (we bring them down for offline backups for a clean disaster recovery). We bumped up RSVNONR in SYS1.PARMLIB(IEASYS00) to ensure we didn't run short between IPLs.
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John Poulakos

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PostPosted: Thu Apr 25, 2019 7:46 pm
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Thank you, gentlemen.

I believe the root cause of the abends and address space "loss" is some authorization errors trying to access a TEST unix directory tree. Why on Earth TEST is locked down makes no sense to me! I am frequently at odds with things our systems programming staff do, so this is nothing new. I only have to deal with them for a few more months until I retire again.

I was able to view SYS1.PARMLIB(IEASYS00) and found they updated it when they did the last IPL... they didn't say anything though.
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enrico-sorichetti

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Joined: 14 Mar 2007
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PostPosted: Thu Apr 25, 2019 8:08 pm
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You believe wrong ...


quoting IBM

Quote:
In some scenarios, address spaces that use cross-memory services prevent their ASIDs from being reused and increase the possibility of an ASID shortage.


once upon a time it was pretty common with the IRLM address space ( both for IMS and DB2 )
and for the DB2 MSTR address space

IIRC the relevant IMS and DB2 manuals used to suggest to adjust properly
RSVNONR, RSVSTR, and MAXUSER

init and tuning guide,
Use [URL] BBCode for Links

init and tuning reference
Use [URL] BBCode for Links
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John Poulakos

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Joined: 13 Jun 2012
Posts: 180
Location: United States

PostPosted: Fri Apr 26, 2019 1:20 am
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Why do I believe wrong?

There are no abends related to the user ID in question for anything but trying to update test unix folders with IKJEFT01 and getting JCL errors.
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