MSC= parameter for procedures

Use the MSC= parameter in procedure to specify whether the Multiple Systems Coupling (MSC) function is initialized. Valid values are N, and Y. The default is N.

When the MSC= execution parameter is omitted, unless MSC resources are defined by the MSC stage-1 system definition macros, MSC=N is the default. When MSC resources are defined during stage-1 system definition, specifying MSC=Y to initialize MSC is optional.

You cannot change the MSC value before a warm or emergency restart. If IMS is either warm started or emergency restarted with a different MSC value, IMS restart abends.

In an XRF or FDBR environment, the MSC value must be the same on the primary and backup IMS systems.

When IMS initialization or restart completes, IMS issues message DFS1929I, which displays the MSC= value that is currently in effect.

N: Prevents MSC from initializing.
Any defined MSC resources or parameters are ignored. If MSC=N and MSLINK, MSPLINK, and MSNAME resources are defined in the IMSVS.RESLIB DFSCLL3X member that is created by the stage-1 system definition, they are ignored.
Y: Initializes the MSC function even if no MSC links have been defined as part of the system definition process.
When MSC=Y, the SYSID= keyword must be specified in the MSC section of the DFSDFxxx member of the IMS PROCLIB data set.