IBM DS3500, Installation, User'S, And Maintenance Manual

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Power-on LED (green)
LED is lit, it indicates that the power supply is turned on and is supplying both 5-volt and
12-volt dc power.
System locator LED (blue)
This blue LED can be lit by the Storage Manager software to aid in visually locating the storage
subsystem.
Overtemperature LED (amber)
When this amber LED is lit, it indicates that the storage subsystem is in an over temperature
condition.
System error LED (amber)
When this amber LED is lit, it indicates that the unit has a fault, such as in a power supply,
controller, or drive.
Standby power LED (green)
Future use only.
Drive activity LED (green)
Each drive has an activity LED. When this green LED is flashing, it indicates drive activity.
Drive status LED (amber)
Each drive has a status LED. When this amber LED is lit continuously, it indicates a drive failure.
When it is flashing, it indicates that the controller is identifying or building a drive.
Controller LEDs
This section describes the controller LEDs on the rear of the storage subsystem.
Power-on LED
System locator LED
System error LED
Overtemperature LED
Standby power LED
Hard disk
drive status
LED (amber) Hard disk
drive activity
LED (green)
Figure 4-6. DS3524 storage subsystem and EXP3524 storage enclosure front LEDs
Figure 4-7. Controller LEDs
Chapter 4. Operating the storage subsystem and storage enclosure
4-9