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CICS Short On Storage issue

 
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simmimahajan

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Joined: 27 Mar 2007
Posts: 30
Location: USA

PostPosted: Thu Mar 18, 2010 5:24 pm    Post subject: CICS Short On Storage issue
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Hi All,

We are executing CICS in one of our region. We are experiencing following issue with the region:

DIPQ:EVE603W SUBSYSTEM CICDP3X0 IS UNDER STRESS - SHORT ON STORAGE


Can anybody pls guide me on how can we resolve the same? Any pointers would help


Thanks!
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Robert Sample

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Joined: 06 Jun 2008
Posts: 7989
Location: Bellevue, IA

PostPosted: Thu Mar 18, 2010 5:55 pm    Post subject:
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Short answer (which is always true for S-O-S problems): figure out what's eating up the storage and change the program(s) to resolve it -- or add more memory to the region.

Run a STAT in the region and find out which storage pool is having the problem. If it's one of the above-the-line pools like ECSA, and you can increase the memory to that pool, that could be a quick fix. If it's one of the below-the-line pools, and the problem just recently started, you need to look at application program changes recently and identify which program(s) are using up the storage. Getting the application to run above the line is often the best way to resolve below-the-line S-O-S issues.

If someone recently made a region change (say increasing max tasks from 50 to 250, for example), without changing the memory allocation for the region appropriately, that could also cause S-O-S issues.

So it could be an application OR a system issue -- without doing investigation on site, you cannot really say which, nor how to fix it. But you definitely don't want S-O-S situations to continue as they have big impacts on response times.
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simmimahajan

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Joined: 27 Mar 2007
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Location: USA

PostPosted: Thu Mar 18, 2010 6:11 pm    Post subject: Reply to: CICS Short On Storage issue
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Thanks Sure, trying to gather more information on this.
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Bill O'Boyle

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Joined: 14 Jan 2008
Posts: 2502
Location: Atlanta, Georgia, USA

PostPosted: Thu Mar 18, 2010 7:29 pm    Post subject: Reply to: CICS Short On Storage issue
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Is the SOS occurring on below-the-line or above-the-line DSA?

Issue a CEMT INQUIRE SYSTEM (if you're authorised) and capture the values set to DSAlimit (below-the-line) and EDsalimit (above-the-line).

I have to assume that this SOS is occurring on User-DSA?

Please post the DFH message and exact verbiage associated with the SOS condition and someone may be able to assist further.

However, there's no magic bullet in determining SOS. It takes research.

If you have TMON for CICS, you may be able to find the culprit transaction/program.

Ask your CICS Sysprog and/or Tech Support folks for assistance.

Bill
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