How to Remove a System from the MIMPLEX when COMMUNICATION=CTCONLY

In this example, we are going to remove the system GK23 from the MIMPLEX.
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In this example, we are going to remove the system GK23 from the MIMPLEX.
1.First, enter the DISPLAY SYSTEMS command and verify that GK23 is currently FREED:
@D SYSTEMS                                                                GPK0067I Command DISPLAY 101                                          GPK0108I SYSTEMS DISPLAY                                                 INDEX ALIAS SYSTEM   RELATION STATUS      OPSYS     LAST ACCESS        01    03   GK03     LOCAL    MASTER      zOS  2016.117 08:53:49.44     02    13   GK13     EXTERNAL ACTIVE      zOS  2016.117 08:53:49.04     03    23   GK23     EXTERNAL FREED       zOS  2016.117 08:53:46.22     04    49   GK49     EXTERNAL ACTIVE      zOS  2016.117 08:53:49.24     05    62   GK62     EXTERNAL ACTIVE      zOS  2016.117 08:53:49.36
2.Next, enter the DISPLAY GLOBALVALUE command and determine if GK23 is present in the VCFMASTER list:
 @D GLOBALVALUE                                                           GPK0067I Command DISPLAY 203                                          GPK0373I MIM GLOBALVALUE display:                                        ANYELIGIBLE=YES       MOSTPREFERRED=YES     NOMASTER=WAIT             VCFMASTER=( GK03, GK13, *GK23, GK49, GK62 )                           ELIGIBLE MASTER LIST: GK03, GK13, GK49, GK62  
3.Since GK23 was in the list, it needs to be removed. This can be done by entering the GLOBALVALUE command without GK23:  
@GLOBALVALUE VCFMASTER=(GK03,GK13,GK49,GK62)                          GPK0067I Command GLOBALVALUE 210                                       GPK0193I GLOBALVALUE command processing initiated                     GPK0363I GLOBALVALUE command changes pending on external systems      GPK0362I GLOBALVALUE command processing complete                      @D GLOBALVALUE                                                             GPK0067I Command DISPLAY 223                                          GPK0373I MIM GLOBALVALUE display:                                        ANYELIGIBLE=YES       MOSTPREFERRED=YES     NOMASTER=WAIT             VCFMASTER=( GK03, GK13, GK49, GK62 )                                  ELIGIBLE MASTER LIST: GK03, GK13, GK49, GK62 
4.Next, Change GK23 to a DISABLED status:
 @ALTERSYS GK23,STATUS=DISABLED                                        GPK0067I Command ALTERSYS 257                                         GPK0712I Processing ALTERSYS command...                               GPK0706I System GK23 attribute altered: DISABLED                      GPK0711I ALTERSYS Command Succeeded    
5.Next, confirm that GK23 is now missing from the DISPLAY SYSTEMS command output:
@D SYSTEMS                                                                GPK0067I Command DISPLAY 262                                          GPK0108I SYSTEMS DISPLAY                                                 INDEX ALIAS SYSTEM   RELATION STATUS      OPSYS     LAST ACCESS        01    03   GK03     LOCAL    MASTER      zOS  2016.117 08:56:22.54     02    13   GK13     EXTERNAL ACTIVE      zOS  2016.117 08:56:22.03     04    49   GK49     EXTERNAL ACTIVE      zOS  2016.117 08:56:21.57     05    62   GK62     EXTERNAL ACTIVE      zOS  2016.117 08:56:22.16
6.Next, update necessary MIMPARMS, including:
>Remove the checkpoint file allocation, unless system symbolics are used as part of the dataset name.
>Remove any IFSYS statements(if used)
>Remove the system from the GLOBALVALUE VCFMASTER list.
>Comment out or delete any CTCPATH statements containing the system being removed.
>Do *not* remove the old system from the DEFSYS statement as this may cause inconsistencies between the control file and the checkpoint file.
 
This procedure hides the old system from the DISPLAY SYSTEMS command. If you really want to completely remove the system from the control file, you will need to update the DEFSYS statement and restart MIM globally with a control file format.