MIM leaves exits ISGNQXITBATCHCND installed

Products

• MIM Resource Sharing (MIM)
• MIM Data Sharing (MII)
• MIM Tape Sharing (MIA)
• MIM Message Sharing (MIC)

Issue/Introduction

You brought your systems down for maintenance, which includes shutting down MII. Found that two GRS exits were still installed at MII termination.

Using the MVS Display command, you receive:

D PROG,EXIT,EXITNAME=ISGNQXITBATCHCND         
CSV461I 07.47.29 PROG,EXIT DISPLAY 891        
EXIT             MODULE   STATE MODULE   STATE
ISGNQXITBATCHCND MIM>XXBC   A   MIM>QXFX   A 

You performed the normal "F MII,SHUTDOWN FREE" command which took MII down, but these exits were still installed.

Shouldn't the exits be removed if MII is shut down?  How do we get the exits removed?

 

 

Resolution

Both ISGNQXITBATCH and ISGNQXITBATCHCND are dynamic IBM exits that are called/invoked by CA MIM at initialization. CA MIM uses these exits to intercept enqueue/dequeue processing.

Both exits remain active following the initial startup of MIM on the system, as shown in the example here:

 

Before Starting MIM:

07:54:58.38 STC00051 00000290  D PROG,EXIT,EXITNAME=ISGNQXITBATCHCND
07:54:58.42 62       00000090  CSV463I NO MODULES ARE ASSOCIATED WITH EXIT ISGNQXITBATCHCND

    

After MIM Synchronization Completes:

08:00:12.81 62S00059 00000290  IEF196I IEF237I JES2 ALLOCATED TO MIMLOG
08:00:27.96 STC00051 00000290  D PROG,EXIT,EXITNAME=ISGNQXITBATCHCND
08:00:27.97 62       00000090  CSV461I 08.00.27 PROG,EXIT DISPLAY 029
                 029 00000090  EXIT             MODULE   STATE MODULE   STATE MODULE   STATE
                 029 00000090  ISGNQXITBATCHCND MIMFXXBC   A   MIMFQXFX   A

After MIM Shutdown:

08:00:52.17 62       00000090  IEF352I ADDRESS SPACE UNAVAILABLE
08:00:52.17 62       00000290  IEF196I IEF352I ADDRESS SPACE UNAVAILABLE
08:00:52.17 62       00000290  IEA989I SLIP TRAP ID=X33E MATCHED.  JOBNAME=*UNAVAIL, ASID=002A
08:00:52.51 STC00051 00000290  D PROG,EXIT,EXITNAME=ISGNQXITBATCHCND
08:00:52.52 62       00000090  CSV461I 08.00.52 PROG,EXIT DISPLAY 080
                 080 00000090  EXIT             MODULE   STATE MODULE   STATE MODULE   STATE
                 080 00000090  ISGNQXITBATCHCND MIMFXXBC   A   MIMFQXFX   A

 

Looking further into why the exit is not set to inactive after the MIM address space ends, the exit code performs a check to see if MIM is active. This allows the exit to be reused for subsequent restarts of MIM.