IIOP in a sysplex

You can implement a CICS® CORBA server in a single CICS region. However, in a sysplex it's likely that you'll want to create a server consisting of multiple regions. Using multiple regions makes failure of a single region less critical and enables you to use workload balancing. A CICS logical server consists of one or more CICS regions configured to behave like a single server.

Typically, a CICS logical server consists of:

Note:
The listener regions and AORs may be separate or combined into listener/AORs. You must specify the following system initialization parameters:
IIOPLISTENER=YES
Specify this value in a listener region, or in a combined listener/AOR. YES is the default value.
IIOPLISTENER=NO
Specify this value in an AOR that is not also a listener region.