Datacom MUF region gets an SVC dump for an abend in IBM IOS module IECVEXSM

book

Article ID: 129507

calendar_today

Updated On:

Products

CA Datacom - DB CA Datacom CA Datacom - AD CA Datacom - Server CA CIS CA Common Services for z/OS CA 90s Services CA Database Management Solutions for DB2 for z/OS CA Common Product Services Component CA Common Services CA Datacom/AD CA ecoMeter Server Component FOC CA Easytrieve Report Generator for Common Services CA Infocai Maintenance CA IPC Unicenter CA-JCLCheck Common Component CA Mainframe VM Product Manager CA Chorus Software Manager CA On Demand Portal CA Service Desk Manager - Unified Self Service CA PAM Client for Linux for zSeries CA Mainframe Connector for Linux on System z CA Graphical Management Interface CA Web Administrator for Top Secret CA CA- Xpertware

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.    

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. 
 

Environment

Datacom/DB 15.0 or higher on z/OS - applications performing GETIT processing

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.