Advanced Topics › XCF as the Initial Communication Method › Implementing XCF Communication

Implementing XCF Communication

To implement XCF 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 the following DEFSYS statements:

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

2. To specify preferred master systems and recovery options use the GLOBALVALUE statement.
3. Specify XCF as the initial communications method using the MIMINIT COMMUNICATION statement.
4. 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
   

5. To provide addition redundancy, you can also define CTC devices for CA MIM communication using CTCPATH statements:

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

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