DFHIRP coexistence

To use CICS® multiregion operation (MRO) support, install DFHIRP in the link pack area (LPA). DFHIRP can only be used from the LPA. This means that in an MVS™ image there can only be one version of the module named DFHIRP, which must be at the highest release level of the CICS regions that run in that MVS image.

Within a Parallel Sysplex®, where MRO communication between MVS images is through XCF/MRO, the DFHIRP programs installed in the different MVS images can be at different release levels. However, the DFHIRP in an MVS image must be installed from the highest release of CICS running in that MVS image. For example, a CICS/ESA Version 4 DFHIRP can communicate with a CICS Transaction Server DFHIRP across XCF/MRO, but the CICS regions running in the MVS with the Version 4 DFHIRP cannot be later than CICS/ESA Version 4. See Figure 3 for an illustration of valid configurations for MRO with different levels of DFHIRP installed in the sysplex.

Note:
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The CICSPlex SM modules EYU9X310 and EYU9A310, which reside in the MVS linklist, are release specific and are not downward compatible with earlier versions. If you plan to run multiple releases of CICSPlex SM on the same MVS image, you must have the equivalent modules in the MVS linklist for each of the releases you are running.
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