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Datacom MUF region gets an SVC dump for an abend in IBM IOS module IECVEXSM
Article ID: 129507
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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.
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.
Datacom/DB 15.0 or higher on z/OS - applications performing GETIT processing
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.
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.