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Chapter 8: Troubleshooting

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See page 167 for more information about field-replaceable components. 
See page 228 for a discussion of critical and offline logical drives.

There are two LEDs on each Drive Carrier. They report the presence of power 
and a disk drive, and the current condition of the drive. 

Power

System Off

Normal

FRU*

System Off

Normal

Fan, battery 

or PSU 

Problem

Fan, battery 

or PSU 

Failed

Logical 

Drive

System Off

Normal

Logical 

Drive Critical

Logical 

Drive Offline 

Controller 

Activity

No Activity

Activity

Controller 

Heartbeat

System Off

Normal**

* Field Replacement Unit: includes fan, battery and power supply unit (PSU).

** Blinks green seven times in three seconds, goes dark for six seconds, then 

repeats the blink pattern.

Disk Status

Power/Activity