Light Path Diagnostics - Lenovo ThinkSystem SN850 Product Manual

Once connected you can see the following information:
Server status including error logs (read only, no login required)
Server management functions (XClarity login credentials required)

Light Path Diagnostics

The SN850 includes light path diagnostics. If an environmental condition exceeds a threshold or if a
system component fails, XCC lights LEDs inside the server to help you diagnose the problem and find the
failing part.
For quick problem determination when you are physically at the server, the server offers the following
three-step guided path:
Illuminate the Fault LED on the front panel.
Identify the fault in the light path diagnostics panel, as shown in the following figure.
If a DIMM is faulty, the LED next to it is illuminated.
The SN850 light path diagnostics panel is inside the server near the front panel, as shown in the following
figure.
Figure 10. Location of SN850 light path diagnostics panel
To illuminate the light path diagnostics LEDs, power off the server, slide it out of the chassis, and press
and hold the power button. The power button doubles as the light path diagnostics reminder button when
the server is removed from the chassis.
The meanings of the LEDs in the light path diagnostics panel are listed in the following table.
Lenovo ThinkSystem SN850 Server 32