To install support for multiregion operation, you must:
Installing support for cross-system MRO (XCF/MRO) requires some additional administration. This is described in Requirements for XCF/MRO.
Multiregion operation with CICS Transaction Server for z/OS® requires MVS/VS Subsystem Interface (SSI) support. You must therefore install CICS as an MVS subsystem. For information about how to do this, see the CICS Transaction Server for z/OS Installation Guide.
You must include the intersystem communication management programs in your system by specifying ISC=YES on the system initialization parameters.
For multiregion operation, there are some modules that, for integrity reasons, must be resident in the shared area or loaded into protected storage.
You must place the CICS Transaction Server for z/OS, Version 3 Release 1 versions of the following modules in the link pack area (LPA) of MVS.
Multiregion operation requires the CICS interregion communication modules to run in supervisor state to transfer data between different regions. CICS achieves this by using a normal supervisor call to this startup SVC routine, which is in the pregenerated system load library (CICSTS31.CICS.SDFHLOAD).
The SVC must be defined to MVS. For information about how to do this, see the CICS Transaction Server for z/OS Installation Guide.
To help you get started with MRO, a CICS job and a CICS startup procedure are supplied on the CICS distribution volume. For each MRO region, you must also create the CICS system data sets needed. See the CICS Transaction Server for z/OS Installation Guide for information about this.