To test UIMs with HCD, use the procedures detailed in z/OS HCD User's Guide to:

• Initialize HCD. This checks that the UIMs have been loaded by HCD.
• With the HCD function Query supported hardware and installed UIMs you can verify whether the control unit and device defined in your UIM are displayed.
• Use the HCD batch utility "Print Supported Hardware Report" to verify whether the control units and devices defined in your UIM are shown.
• With the HCD function Define, modify, and view configuration data you can check whether the control unit and device specified in your UIM can be defined in the dialog.
• Use the report facility against the IODF to detect certain errors before using the IODF during system IPL. For example, this can detect errors in a UIM's device features table (DFT) build process.

If no errors are encountered during these tests, there are probably no errors in the UIMs.