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Light path diagnostics
Light path diagnostics is a system of LEDs on various external and internal components of the server that
leads you to the failed component. When an error occurs, LEDs are lit on the front operator panel on the front
of the server, then on the failed component. By viewing the LEDs in a particular order, you can often identify
the source of the error.
Operator panel light path LEDs
The following illustration shows the light path diagnostic LEDs for the server, which are located on the
operator information panel.
Figure 148. Operator information panel LEDs
Table 38. Light path diagnostics: Operator information panel LED status and actions
LED
Power button and
1
power LED
Network activity LED
2
System ID LED (blue)
3
System-error LED
4
(amber)
Rear light path LEDs
The following illustration shows the light path diagnostic LEDs located on the rear of the server.
Description
Indicates power status of the server.
Indicates activity between the server and
the Ethernet LAN.
This LED is used as a presence detection
LED. You can use Lenovo XClarity
Controller to light this LED remotely.
LED on: An error has occurred.
Action
Not used for troubleshooting server beyond
providing power status. See "Front
operator panel" on page 26 for additional
information.
Not used for troubleshooting server beyond
providing network activity status. See
"Front operator panel" on page 26 for
additional information.
Use this LED to locate the server among
other servers visually.
1. Check the system-locator LED and
check log LED and follow the
instructions.
2. Check the Lenovo XClarity Controller
event log and the system-error log for
information about the error.
3. Save the log if necessary and clear the
log afterward.
.
Chapter 10
Problem determination
245
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