IBM DS3500, Installation, User & Maintenance Manual

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Power-on LED (green)
When this 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 DS 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 hard disk drive.
Standby power LED (green)
Future use only.
Hard disk drive activity LED (green)
Each hard disk drive has an activity LED. When this green LED is flashing,
it indicates drive activity.
Hard disk drive status LED (amber)
Each hard disk 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 69. DS3524 storage subsystem and EXP3524 expansion enclosure front LEDs
Chapter 4. Operating the storage subsystem and expansion enclosure
75