Checking your cross-system coupling facility (XCF) groups names

• Each shared registry requires a unique XCF group name.
• The DBC creates an XCF group based on the DBC group name specified as the value for the G parameter on the DBC$STC started task.

• The System and SQL Performance for Db2 products use a DOM agent that runs in the DBC. The DOM agent starts an XCF group based on the DOMPLEX option set name specified in the DOMOPTS member located in the data set referenced on the DBCENV DD in the DBC started task JCL.

  This XCF group should not be shared with other processes. If the DOMPLEX option set name is the same as the DBC GROUP name, the DOM code will add $ to the end of the name (or change the last character to $) to make the name unique. Doing so ensures that the XCF group differs from the one used by the DBC, even if the DBC group name matches the DOMPLEX option set name. The XCF group must be the same for all DOM agents in order to show data collected for remote Db2 subsystems.

• The LGC agent starts an XCF group based on the DBC GROUP with the letter L added or modified to the end to make it unique.
  
• The BRD agent starts an XCF group based on what you specify in the BRD option set.

All XCF groups must have different names.

To check XCF group names and enable communication between groups

1. To display XCF groups that are already in use, issue the following console command:

   D XCF,GROUP

   The following sample output displays the list of active XCF groups.

   D XCF,GROUP                                                       
   
   IXC331I  12.30.20  DISPLAY XCF 831                                 
      GROUPS(SIZE):   COFVLFNO(3)       EZBTCPCS(3)       HSFIXC(2)   
                      IGG0CAS(3)        ISTCFS01(3)       ISTXCF(3)   
                      OSZRTCS(2)        RTCS2(3)          SYSATB01(2)
                      SYSATB02(2)       SYSATB03(2)       SYSCNZMG(1)
                      SYSDAE(4)         SYSENF(3)         SYSGRS(3)   
                      SYSIEFTS(3)       SYSIGW00(3)       SYSIGW01(3)
                      SYSIKJBC(3)       SYSIOSPX(3)       SYSIOS01(3)
                      SYSJES(3)         SYSJ2$XD(3)       SYSMCS(8)   
                      SYSMCS2(44)       SYSRMF(3)         SYSTTRC(3)  
                      SYSWLM(3)         SYSXCF(3)          

2. To determine the names of the XCF groups that are in use, review the DBC$STC started task log and search for XCF.
   
   
3. To enable communication across XCF groups for all components from one LPAR to another, observe the following guidelines:
   • Both DBC subsystems should be defined to the same DBC group and should reside in the same sysplex.
   • Both DBC subsystems should join the same XCF group that the DBC uses.
   • Both DOM agents should join the same XCF group as defined by using the same DOMPLEX option set.
   • Both LGC agents should join the same XCF group.
   • Both BRD agents should join the same XCF group.