The IEFSSNaa MVS subsystem initialization member

To define CICS® as an MVS™ subsystem, code an entry in the IEFSSNaa member in the SYS1.PARMLIB library. If you want to use the console message handling facility, Start of change or to change the number of pipes that can be allocated in an EXCI address space, End of change code the entry by using one of the following methods:

CICS,DFHSSIN,DFHSSIyy

or

SUBSYS SUBNAME(CICS)
  INITRTN(DFHSSIN)
  INITPARM(DFHSSIyy)

This entry is used for every CICS region, that you have IPLed with this version of the IEFSSN member, that runs under MVS. Start of changeYou do not have to specify both DFHSSIN and DFHSSIyy, however apart from the suffix yy, you must code the entry for each parameter using the exact format given in the example.End of change The meanings of the terms are as follows:

CICS
is the name of the CICS subsystem.
DFHSSIN
is the name of the CICS subsystem routine that initializes the console message-handling facilities, Start of changeand the number of pipes that can be allocated in an EXCI address spaceEnd of change. If you omit this name, CICS is defined as an MVS subsystem, but none of the console message-handling facilities are enabled, Start of changeand the default number of pipes, that can be allocated in an EXCI address space will be used. That default is 100.End of change.
DFHSSIyy
is the name of a SYS1.PARMLIB member, described below, in which you have defined initialization parameters for message-formatting Start of changeand EXCI pipe allocation End of change for the CICS subsystem. If you specify DFHSSIN but omit DFHSSIyy, the DFHSSIN routine tries to use the parameters that are defined in member DFHSSI00.

If the DFHSSI00 member does not exist, the routine uses the default values.

The IEFSSNaa member in the SYS1.PARMLIB library also contains the definitions for all the other subsystems needed for this IPL of MVS, for example JES2, IRLM, and DATABASE 2 (DB2®).

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