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The tape devices managed by CA MIA are a subset of these hardware resources. I/O configurations must be defined to both the operating system software as well as the channel subsystem (hardware). Both the hardware and software I/O configuration processes are consolidated in a single interactive end-user interface called the Hardware Configuration Definition (HCD) component of z/OS.
The output from HCD is an I/O Definition File (IODF), which contains I/O configuration data. An IODF can define multiple hardware and software configurations to the operating system. When an IODF is ACTIVATED, HCD actually defines the I/O configuration to the channel subsystem, the operating system, or both. With the HCD ACTIVATE function or the z/OS ACTIVATE operator command, changes can be made to the current configuration without the need to initial program load (IPL) the software or power-on reset (POR) the hardware. Making configuration changes while the system is running is known as dynamic configuration or dynamic reconfiguration.
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