IOCP and system generation of a z/VSE operating system

You must define your I/O configuration to both software and hardware. VSE builds the ASI Procedure file, which contains the statements that define the I/O configuration to your z/VSE® operating system.

To define the I/O configuration to hardware, use a set of I/O statements in a separate IOCP file. IOCP uses the I/O statements in the IOCP file to define the I/O configuration to the CPC.

Figure 1 shows an overview of the processing performed by the z/VSE version of IOCP.

1. For VSE system generation, the ASI Procedure file defines the I/O configuration information to the system control program.
2. The input file contains the IOCP statements used to define the I/O configuration to IOCP.
3. IOCP processes the IOCP statements, generates an IOCDS, produces reports, and, when requested, writes the generated IOCDS to the Support Element hard disk.
4. The configuration reports allow you to check the I/O configuration as defined in the IOCDSs.
5. The IOCDSs reside on the Support Element hard disk. At power-on reset, the Support Element loads the I/O configuration data into the hardware system area (HSA). (The I/O subsystem uses the data in the hardware system area (HSA) to control I/O requests.)