Maintaining IMSplex-wide parameters

The PLEXPARM parameters, GSTSAREA=, GSTSDB=, and GSTSTRAN=, define whether or not global status is maintained. Values for these parameters are maintained in the RM resource structure.

This ensures that all IMS systems in the IMSplex have the same values for the global PLEXPARM values. The first IMS system that starts in an IMSplex writes its global PLEXPARM values from its DFSCGxxx or DFSDFxxx PROCLIB member data set to the RM resource structure. IMS systems that subsequently start use the values defined in RM. If the PLEXPARM values in the IMS system starting up do not match the PLEXPARM values in RM, message DFS3425I is issued, indicating that the IMS values are overridden by the RM values.