Set up IXMAINT for Datacom failover to Shadow MUF

Products

• Disk Backup and Restore - MVS
• DISK BACKUP AND RESTORE- ADD-ON OPTIO
• DISK BACKUP AND RESTORE

Issue/Introduction

Should IXMAINT be excluded from failover processing to the Shadow MUF ?

Environment

Release: Disk™ Backup and Restore 12.5

Resolution

Yes, IXMAINT should be excluded from failover processing to the Shadow MUF.  
Sysparm DCOMFAIL is normally set to RR (Reopen) in the SYSPARMS member to enable failover processing to the Shadow MUF.  However, Sysparm DCOMFAIL should be overridden with value SS (Shutdown) in the IXMAINT job to stop failover processing because IXMAINT's massive amount of FDB processing should remain with a local MUF rather than failover to a remote MUF with extensive XCF and extended run-times. It is recommended to run IXMAINT with a local MUF in the Tech Guide.

When DCOMFAIL is set to SS, the first S means to exit the IXMAINT as soon as possible at a data set boundary when a LOCAL DISKMUF goes to EOJ.  The second S indicates to do the same when a NON-local DISKMUF goes to EOJ.