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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.
Front panel
Figure 268. Front panel
Table 27. Components on the front panel
Power button with power status LED (green)
1
Network activity LED (green)
2
1
Power button with power status LED (green)
You can press the power button to power on the server when you finish setting up the server. You also can
hold the power button for several seconds to power off the server if you cannot shut down the server from
the operating system. The states of the power LED are as follows:
Status
Off
Flashing rapidly (four
times per second)
Flashing slowly (once
per second)
Lit
Network activity LED (green)
2
The network activity LED on the front panel helps you identify the network connectivity and activity.
Status
On
Blinking
Off
3
System ID button with system ID LED (blue)
Use this system ID button and the blue system ID LED to visually locate the server. Each time you press the
system ID button, the state of the system ID LEDs changes. The LEDs can be changed to on, blinking, or off.
You can also use the Lenovo XClarity Controller or a remote management program to change the state of the
system ID LEDs to assist in visually locating the server among other servers.
Color
Description
None
No power supply is properly installed, or the LED itself has failed.
Green
The server is turned off and is not ready to be turned on. The power button is
disabled. This will last approximately 5 to 10 seconds.
Green
The server is turned off and is ready to be turned on. You can press the power
button to turn on the server.
Green
The server is turned on.
Color
Description
Green
The server is connected to a network.
Green
The network is connected and active.
None
The server is disconnected from the network.
System ID button with system ID LED (blue)
3
System Error LED (yellow)
4
Chapter 5
.
Problem determination
333
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