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ABCs of z/OS System Programming Volume 10 by Luiz Carlos Orsoni, Alvaro Salla, Paul Rogers

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Hardware Configuration Definition (HCD)
Several hardware components, including PR/SM and the channel subsystem (CSS) together with the IBM z/OS operating system need to know what hardware resources (mainly I/O) and other software information are available in the system and how these resources are connected. This information is called the configuration and it is provided by your installation. You must describe this configuration to be used at IPL by z/OS (software) and to be used at power-on reset by the channel subsystem and PR/SM (hardware). In ...

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