Advanced Topics › Communication Methods › Cross-system Communication Methods › Virtual Control File Communication Methods › CTCONLY Communication Method › Implement CTCONLY Communication

Implement CTCONLY Communication

To implement the CTCONLY communication method, you customize certain parameters in the MIMINIT member:

To select the CTCONLY communication method

In the MIMINIT member,

1. Define all systems participating in the MIMplex using the DEFSYS statement:

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

2. Define the VCF recovery options and master candidate list:

   GLOBALVALUE ANYELIGIBLE=yes/no,
               MOSTPREFERRED=yes/no,
               NOMASTER=wait/term,
               VCFMASTER=(sysa,sysb,...,sysn)
   

3. Define the CTC device addresses for use in the MIMplex:

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

4. Define the CTCONLY communication method:

   MIMINIT COMMUNICATION=CTCONLY
   

5. Define checkpoint files for use by each system:

   IFSYS sysa
     MIMINIT CHKPTDSN=sysa.dsn
   ENDIF
   IFSYS sysb
     MIMINIT CHKPTDSN=sysb.dsn
   ENDIF
   

   Alternatively, you can use the ALLOCATE command placed in the MIMINIT member to define the checkpoint files to be used by each system:

   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 Statement and Command Reference Guide.