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Hardware Diagnostics for Sun Systems: A Toolkit for System Administrators (Doc ID 1005946.1)

Last updated on OCTOBER 04, 2019

Applies to:

Solaris Operating System - Version 8.0 and later
All Platforms


Have you ever stared at the ok prompt on your Sun system, and wondered how to continue Or have you ever wondered why all the LEDs on the system board sometimes appear to flash madly like a broken street light.

Look no further -- read on to find the answer to these questions.

By using OpenBootTM commands, the Power On Self Test (POST) program, and the status LEDs on system boards, you can diagnose hardware related problems on Sun Microsystems TM server and desktop products. With these low-level diagnostics, you can establish the state of the system and attached devices. For example, you can determine if a device is recognized by the system and working properly, or you can also obtain useful system configuration information.

Use this table to locate subjects in this article:

OpenBoot Prom (OBP) Diagnostic Commands and Tools

Describes OBP commands you can use to display the system configuration, test devices attached to the system, monitor network connections, and more.


Shows how you can run tests and perform diagnostics on the main logic board and its interfaces, and on devices such as disk and tape drives.

Power On Self Test (POST)

Explains how POST initializes, configures, and tests the system, and shows you how to capture POST output and interpret the results using the LEDs on the system board and power supply.

System Board and Power Supply LED Status Tables

Provides reference information to help you interpret the meaning of LED status for system boards and power supplies installed on Ultra TM Enterprise Server products.

Solaris Operating Environment Diagnostic Commands

Lists useful OS commands you can use to display the system configuration, including failed Field Replaceable Units (FRU), hardware revision information, installed patches, and more


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