Sun Microsystems, Inc.   Sun System Handbook - ISO 3.4 June 2011 Internal/Partner Edition
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Enterprise 220R/420R LEDs

Front Panel LEDs

System front panel LEDs provide your first indication if there is a problem with your system. Usually, a front panel LED is not the sole indicator of a problem. Error messages and even other LEDs can help to isolate the problem further.



The two system LEDs consist of a system health indicator and a fault indicator. The system health indicator lights continuously green to show that the system is functioning normally. The fault indicator lights when a problem is detected in the system. Because it is important to know that a fault exists in the system, the fault indicator remains lit whether the system is in normal operating mode, or is switched to Standby mode using the keyswitch.

When you first power on the system, the LEDs are individually toggled on and off to verify that each one is working correctly. After that, the LEDs operate as described in the following table.
 
Name
 Icon Description
Power-on/Activity This green LED lights continuously when the system power is on.
General fault This amber LED lights steadily when a system fault is detected (including a fault reported by a power supply LED fault).

Power Supply LEDs

Power supply LEDs are visible from the front of the system with the doors open. The following figure shows the LEDs on the power supply in bay 0.

The following table provides a description of each LED.

LED Name

Icon

Description

DC Status

This green LED is lit to indicate that all DC outputs from the power supply are functional.

Fault

This yellow LED is lit to indicate a fault in the power supply. The supply is non-functional, and there is no DC output to the system. The amber LED on the system front panel also lights if this LED is lit.

AC present

This green LED is lit to indicate that the primary circuit has power. When this LED is lit, the power supply is providing Standby power to the system.

Disk LEDs

The disk LEDs are visible from the front of the system when the left door is open, as shown in the following figure.

When a disk LED lights steadily and is green, it indicates that the slot is populated and that the drive is receiving power. When an LED is green and blinking, it indicates that there is activity on the disk.

 

 

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