How HCD works

HCD stores the hardware configuration data you defined in the IODF. A single IODF can contain definitions for several processors (or LPARs) and several MVS or VM operating systems. It contains all information used to create IOCDSs and the information necessary to build the UCBs and EDTs. When HCD initiates the function to build the IOCDS, the IODF is used as input. The IOCDS with the channel subsystem definitions of a processor is then used to perform POR. The same IODF is used by MVS to read the configuration information directly from the IODF during IPL. If your environment includes z/OS and z/VM on different processors or as logical partitions on the same processor, the IODF can also be used to document the z/VM configuration.

Figure 1 shows an example of a configuration using HCD.