HP MSA 30 User Manual page 30

Installing the System in a Rack
— There is no controller on the bus.
— 5.1-V DC power is not available.
— The drive is not correctly installed in the system.
The LED blinks either by itself or in unison with the Activity LED when there is
SCSI bus activity.
Depending on the host controller, the Fault LED blinks when the controller detects an
error condition.
If the host controller can control the illumination status of the drive LEDs, the display
patterns for various conditions can be interpreted as shown in Tables 2-2 and 2-3.
CAUTION: Because some controllers cannot control all the drive LEDs, you could
misinterpret the display. Refer to the controller documentation before using this table
to determine whether the controller is capable of controlling all the LEDs.
2-12 HP StorageWorks Modular Smart Array 30 User Guide