Installing the modules DFHIRP and DFHCSVC in the LPA

You must install the DFHIRP and DFHCSVC modules to enable your regions to communicate by MRO.

Procedure

  1. Install the current versions of the DFHIRP and DFHCSVC modules into the LPA, as described in Installing CICS modules in the MVS link pack area.
    Notes:
    • If you are running CICS with MRO at different release levels, all communicating CICS regions must use the latest DFHIRP module and the latest SVC module, DFHCSVC, on the same z/OS® image. If a previous version of CICS is already installed on this z/OS image, do not use the dynamic LPA function to replace DFHIRP unless you have a strategy whereby all users of DFHIRP on the z/OS image that is being upgraded can be quiesced. For more information about dynamically updating DFHIRP, see Upgrading MRO. Failure to shut down all users of DFHIRP during the upgrade process can cause incompatibility between control blocks that results in abends that require an IPL of the z/OS image.
    • 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 (CICSTS54.CICS.SDFHLOAD).
  2. Define the SVC module, DFHCSVC, to z/OS, as described in Installing the CICS SVCs.