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The Find Hardware Information Display (1.2) provides critical information about the hardware used on the system. The type and number of I/O devices are good indicators of the system’s processing capabilities.
The Find Hardware Information Display identifies I/O devices by IBM generic model numbers. Keep this in mind when reviewing billing documents. Plug compatible manufacturers (PCMs) sell IBM‑equivalent disk drives. Although the Find Hardware Information Display can show 3390s, the actual equipment can be another vendor’s version of a 3390.
Each I/O device is represented in z/OS by a unique unit control block (UCB). The systems programmer uses the Hardware Configuration Definition (HCD) facility to customize the exact devices that are to be used by the system. The output of the HCD process is a data set called the Input/Output Definition File, or IODF. While the IODF is initially specified at IPL time, it is possible to refresh the IODF definitions while the system is running. Thus, you may find that CA Auditor displays more UCBs than actual devices.
On the Find Hardware Information Display, you can see the UCBs for all potential hardware installed on the system by reviewing the UCB ADDR and DEVICE STATUS fields of the display. If the DEVICE STATUS field shows that a device is offline, this can indicate the device does not physically exist. However, the only sure method is to perform a physical inventory of the data center.
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