User`s guide

Drive Carrier LEDs
007-5759-001 21
Overheat/Power Fail Condition
The overheat LED is illuminated when an “overtemp” condition occurs, see Figure 3-4. A solid
red LED indicates an overheat condition in the system. A flashing red LED that flashes in one
second intervals indicates a fan failure. Check the routing of the cables and make sure all fans are
present and operating normally. You should also check to make sure that the chassis covers and
air shrouds are installed. Finally, verify that the heatsinks are installed properly.
This LED will remain flashing or on as long as the indicated condition exists.
Figure 3-4 Overheat/Fan Failure/Power Fail LED
A flashing red LED which flashes in four second intervals indicates a power failure.
The power fail LED indicates a power supply module has failed or is not functioning properly. In
specific configurations the second power supply module will automatically take the load and keep
the system running - but the failed module will need to be replaced as soon as possible. Refer to
Chapter 6 for details on replacing the power supply. This LED should be off when the system is
operating normally.
LAN Activity LED
When flashing, the LAN activity LED (see Figure 3-3 on page 20) on the system serverboard
control panel indicates network activity on the LAN1 and/or the LAN2 port. This LED will light
up any time there is network traffic on the LAN ports of the serverboard the control panel is
connected to.
Drive Carrier LEDs
Each 3.5-inch hard disk drive carrier has two LEDs, as follows:
• Green: When illuminated, the green LED on the drive carrier indicates drive activity. A
connection to the drive backplane enables this LED to blink on and off when that particular
drive is being accessed. Please refer to Chapter 6 for instructions on replacing failed drives.