Datacom MUF region gets an SVC dump for an abend in IBM IOS module IECVEXSM
Article ID: 129507
Updated On:
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DATACOM - AD
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Issue/Introduction
One of the following messages can be found on the Datacom Multiuser (MUF) joblog:
DUMP TITLE=COMPON=EXCP - STORAGE MANAGER ,COMPID=SC1C6,ISSUER=IECVEXSM,IECVSMFR,PROGRAM ERROR
or
DUMP TITLE=COMPON=EXCP - STORAGE MANAGER ,COMPID=SC1C6,ISSUER=IECVEXSM,IECVSMFR,ABEND= C0D
but the region doesn't crashes.
DUMP TITLE=COMPON=EXCP - STORAGE MANAGER ,COMPID=SC1C6,ISSUER=IECVEXSM,IECVSMFR,PROGRAM ERROR
or
DUMP TITLE=COMPON=EXCP - STORAGE MANAGER ,COMPID=SC1C6,ISSUER=IECVEXSM,IECVSMFR,ABEND= C0D
but the region doesn't crashes.
Environment
Datacom/DB 15.0 or higher on z/OS - applications performing GETIT processing
Cause
The problem is actually in the IBM code and it occurs when one or more applications are actively performing GETIT processing, which causes sequential read-ahead in MUF.
Resolution
IBM APAR OA56384 (title: ABEND C0D IN IECVEXSM ABEND 0C4 IN IECVEXSM) has been opened for this problem. The related IBM PTF must be applied to solve the error.
Additional Information
Workaroud: if the IBM PTF cannot be applied, the Read-ahead feature of Datacom sequential processing can be disabled using the console-like command:
DIAGOPTION 17,1,ON
To enable it again, the following command must be issued:
DIAGOPTION 17,1,OFF
NOTE: Disabling this feature could adversely affect the performance of the applications using sequential commands, as Read-ahead is a sort of "prefetch" that can reduce the number of I/O operations.
In order to use these console-like commands, Datacom/DB 15.0 SO05768 must be applied.
DIAGOPTION 17,1,ON
To enable it again, the following command must be issued:
DIAGOPTION 17,1,OFF
NOTE: Disabling this feature could adversely affect the performance of the applications using sequential commands, as Read-ahead is a sort of "prefetch" that can reduce the number of I/O operations.
In order to use these console-like commands, Datacom/DB 15.0 SO05768 must be applied.
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