Advanced Topics › CTCONLY as the Initial Communications Method › Implement CTCONLY Communication

Implement CTCONLY Communication

To implement CTCONLY as the initial communication method, you customize certain parameters in the MIMINIT member.

Follow these steps:

1. Define the systems participating in the MIMplex using DEFSYS statements:

   DEFSYS(sysa,aa,sysa)
   DEFSYS(sysb,bb,sysb)
   

2. To specify preferred master systems and recovery options use the GLOBALVALUE statement.
3. Define CTC devices for CA MIM communication using CTCPATH statements:

   CTCPATH FROMSYSTEM=sysa ADDRESS=deviceaddress TOSYSTEM=sysb
   CTCPATH FROMSYSTEM=sysb ADDRESS=deviceaddress TOSYSTEM=sysa
   

4. Specify CTCONLY as the initial communications method using the MIMINIT COMMUNICATION statement.
5. Define checkpoint files for each system using the ALLOCATE statement. In your shared CA MIM initialization member use the IFSYS statement to direct commands to specific systems:

   IFSYS sysa
     ALLOCATE DDNAME=MIMCKP00,DSNAME=sysa.primckpt
     ALLOCATE DDNAME=MIMCKP01,DSNAME=sysa.altckpt
   ENDIF
   IFSYS sysb
     ALLOCATE DDNAME=MIMCKP00,DSNAME=sysb.primckpt
     ALLOCATE DDNAME=MIMCKP01,DSNAME=sysb.altckpt
   ENDIF
   

Note: For more information, see the CA MIM Statement and Command Reference Guide.