Defining CICS as an MVS subsystem

You define CICS® as an MVS subsystem before you can use any of facilities listed.

  • The console message-handling facility
  • Multiregion operation (MRO)
  • CICS shared data tables
  • External CICS interface (EXCI).

For information about the console message-handling facility, see Administering CICS operations.

For information about MRO, see Multiregion operation.

The definition of CICS as an MVS subsystem involves three members of the SYS1.PARMLIB partitioned data set: IEASYSxx, IEFSSNaa , and DFHSSIyy. You require only member DFHSSIyy if you want the console message-handling facility.

In an IEASYSxx member of the SYS1.PARMLIB library used for MVS initialization, include the parameter SSN=aa, where aa refers to the SYS1.PARMLIB member IEFSSNaa that contains the definitions for all subsystems required for this IPL of MVS, including the definition of CICS as an MVS subsystem.

aa,xx,yy represent suffixes that are used to distinguish different versions of members of the SYS1.PARMLIB library.

To start CICS with the START command:
  • Give the MVS started task procedure a name different from the subsystem name in IEFSSNaa (default 'CICS'),

    or

  • Issue the start command with the parameter SUB=JES2 or SUB=JES3 as appropriate.

For more information about the subsystem interface, see the z/OS MVS Using the Subsystem Interface manual.