CICS CEMT PERFORM SNAP includes supervisor and SVA address spaces

Troubleshooting

Problem

You coded the z/VSE JCL statement with //OPTION PARTDUMP to exclude the Supervisor and Shared Virtual Area (SVA). The supervisor and SVA storage areas were included in the dump. You issued CEMT PERFORM SNAP.

Cause

CICS CEMT PERFORM SNAP and cancel abend IDUMPs always include the z/VSE supervisor and SVA.

Diagnosing The Problem

The following JCL statements are used in CICS to obtain a dump including the Supervisor and SVA ( Shared Virtual Area ).

// OPTION DUMP,SYSDUMP,SADUMP=8
// LIBDEF DUMP,CATALOG=SYSDUMP.CICSA

This dump was too large to download so the JCL is changed to use OPTION PARTDUMP.

// OPTION PARTDUMP,SYSDUMP,SADUMP=8
// LIBDEF DUMP,CATALOG=SYSDUMP.CICSA

The output in the dump is the same, Supervisor and SVA dumped. The same scenario with a batch job and the PARTDUMP option results in much smaller dump output.

CICS module DFHFFSP honors the specification of the //OPTION dump specifications. The IDUMP parameter list field IDMPFLG1 is set to X'00' by DFHFFSP however, there is an additional dump option flag byte in the IDUMP parmlist where the application requesting the IDUMP can request additional options. DFHFFSP specifies the following as the default for a full IDUMP:

Note: CICS always requests the Supervisor, Supervisor control blocks, and SVA. The only time CICS does not request supervisor control blocks and SVA is if a user application issues an EXEC CICS DUMP with an address range.

Resolving The Problem

Issue the z/VSE AR DUMP partition id command if you only want the CICS address space storage in the dump.

[{"Type":"MASTER","Line of Business":{"code":"LOB70","label":"Z TPS"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSGMGV","label":"CICS Transaction Server"},"ARM Category":[{"code":"a8m3p000000LRasAAG","label":"CICS Transaction Server"}],"ARM Case Number":"","Platform":[{"code":"PF038","label":"z\/VSE"}],"Version":"All Versions"}]

Product Synonym

CICS/VSE CICS VSE z/VSE CICS/TS CICS TS CICS Transaction Server

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Document Information

Modified date:
15 May 2024

UID

swg21026738

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