How JES2 determines the JES2 XCF group name

To allow the JES2 XCF group members to know about each other, either:

Accept the JES2 defaults
or
Define the members to JES2 through the initialization data set.

XCF needs to know about the groups that use its services. It knows about these groups through their XCF group name. The JES2 XCF group name allows a JES2 MAS to be known to XCF. Define each member to JES2 by assigning each MAS a group name that is unique within its sysplex. This group name defaults to the JES2 local node name, which is defined by the NAME= parameter on the NODE(nnnn) initialization statement. (Note that if you use the JES2 network job entry (NJE) facility, this NAME= parameter matches the OWNNODE= parameter on the NJEDEF statement.)

If you need to refer to the sysplex by the same name, specify the same name on the SYSPLEX= keyword in the COUPLExx member of SYS1.PARMLIB. For example, the sysplex specified below is named POK:

SYSPLEX=POK

This is the IBM® recommended approach. It reduces system complexity by allowing the sysplex name, the node name, and the JES2 XCF group to share the same name.

You can assign a unique name through the XCFGRPNM= parameter on the MASDEF initialization statement if your:

NAME= parameter on the NODE(nnnn) statement conflicts with an existing XCF group name.
Current node name does not meet naming restrictions for a JES2 XCF group name
Sysplex contains more than one MAS.
While IBM does not recommend more than one JES2 MAS in a sysplex, your installation can choose this approach. To avoid the ABEND that results if multiple MAS names default to an XCF group name of N1, all but one MAS member must specify a nodename for the OWNNODE= parameter on their NJEDEF statements.

JES2 determines the XCF group name for your JES2 MAS in the following order:

XCFGRPNM= keyword on the MASDEF initialization statement, if specified:
```
MASDEF ...XCFGRPNM=POK
```
The node name defined by the NAME= parameter on the NODE(nnnn) initialization statement, if specified:
```
NODE(nnnn) NAME=POK
```
The node name defined by the nnnn subscript of the NODE(nnnn) initialization statement, if specified:
```
NODE(POK)
```
N1, the JES2-assigned default node name if a node name or XCFGRPNM= is not specified in the initialization data set.