IODF used at IPL

After you complete the input of your configuration data, you have to build a production IODF. The production IODF is used by the operating system to build the configuration data (for example, control blocks) at IPL time. This active production IODF is also used for building the IOCDS.

Figure 5 illustrates the build phase of a production IODF and of an IOCDS.

Figure 5. Building a production IODF and an IOCDS

The production IODF cannot be updated (read-only). This ensures that the data in the production IODF used at IPL remains the same during the run time of that system.