Checking system hardware

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Check the power supplies and LED displays to see if any error codes are displayed. Run the AIX® diag command to test the system unit.

Without an argument, diag runs as a menu-driven program. You can also run diag on a specific piece of hardware. For example:

diag -d hdisk0 -c

Starting diagnostics.
Ending diagnostics.

This output indicates that hdisk0 is okay.