Overview of the z/OS version of IOCP

The z/OS® version of IOCP runs as a job under control of z/OS. Run the z/OS version of IOCP by using z/OS JCL statements. By coding options in the PARM parameter of the EXEC statement, you can request the following IOCP functions:
  • Generate an IOCDS.

    IOCP reads, validates, and checks the syntax of the input statements. It generates an IOCDS based on the configuration defined in the statements. It produces reports of the IOCDS generated, and, when requested, IOCP writes the generated IOCDS to the Support Element hard disk.

  • Produce configuration reports.

    IOCP reads one or more IOCDSs into storage from the Support Element hard disk and prints the IOCP configuration reports. (See IOCP configuration reports for examples.)

See Running the z/OS version of IOCP for a full description of the z/OS version of IOCP. Figure 1 shows an overview of the processing the z/OS version of IOCP performs.

Figure 1. Overview of z/OS version of IOCP
this graphic displays the overview of z/os version of iocp
  1. The card-image input contains IOCP statements.
  2. IOCP processes the IOCP statements, generates an IOCDS, produces reports, and (when requested) writes the generated IOCDS to the Support Element hard disk.
  3. The configuration reports allow you to check the I/O configuration as defined in the IOCDSs.
  4. The IOCDSs reside on the Support Element hard disk. At power-on reset, the I/O configuration data is loaded into the hardware system area (HSA). (Afterward, the I/O subsystem uses the data to control I/O requests.)