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The system’s LEDs are an important tool for hardware event notification and troubleshooting.

LEDs Symbols

SymbolNameDescriptionNormal Conditions

System Status LEDShows the health of the system.Green/Flashing green when booting

Power Supply Units LEDsShows the health of the power supply units.Green

Fan Status LEDShows the health of the fans.Green

*

Unit Identifier LEDLights up on command through the CLI.

Off or blue when identifying a port

System Status LED

System Status LED - Front Side

Front PanelDescription

The LED in the red rectangle shows the system’s status.

It may take up to five minutes to turn on the system. If the System Status LED shows amber after five minutes, unplug the system and call your NVIDIA representative for assistance.

System Status LED Assignments

LED BehaviorDescriptionAction Required
Solid GreenThe system is up and running normally.N/A
Flashing GreenThe system is booting up. This assignment is valid on managed systems only.Wait up to five minutes for the end of the booting process.
Solid AmberMajor error has occurred. For example, corrupted firmware, system is overheated, etc.If the System Status LED shows amber five minutes after starting the system, unplug the system and call your NVIDIA representative for assistance.

Fan Status LED

Fan Status LED - Front and Rear Sides

Front PanelDescriptionRear Panel


Both of these LEDs in the red rectangles show the fans’ status.



Fan Status Front LED Assignments

LED BehaviorDescriptionAction Required
Solid GreenAll fans are up and running.N/A
Solid AmberError, one or more fans are not operating properly.The faulty FRUs should be replaced.

Fan Status Rear LED Assignments (One LED per Fan)

LED BehaviorDescriptionAction Required
Solid GreenA specific fan unit is operating.N/A
Solid Amber

A specific fan unit is missing or not operating properly.

The fan unit should be replaced.

Risk of Electric Shock! With the fan module removed, power pins are accessible within the module cavity. Do not insert tools or body parts into the fan module cavity.

Power Supply Status LEDs

There are two power supply inlets in the system (for redundancy). The system can operate with only one power supply connected. Each power supply unit has a single 2 color LED that indicates the status of the unit.

Power Status LED

Rear Side Panel

Power Supply Unit Status Front LED Assignments

LED BehaviorDescriptionAction Required
Solid Green

All plugged (one or two) power supplies are running normally.

N/A
Solid AmberOne or both of the power supplies are not operational or not powered up/ the power cord is disconnected.

Make sure the power cord is plugged in and active. If the problem resumes, the FRUs might be faulty, and should then be replaced.

The power supply status LEDs on the rear side of the system are located on the PSUs themselves. Each PSU has a single 2 color LED.

Power Supply Unit Status Rear LED Assignments

LED BehaviorDescriptionAction Required
Solid GreenAll PS units are connected and running normally.N/A
Flashing Green 1Hz

AC present / Only 12VSB on (PSU off) or PSU in Smart-on state.

Call your NVIDIA representative for assistance.
AmberAC cord unplugged or AC power lost while the second power supply still has AC input power.Plug in the AC cord of the faulty PSU.
PS failure (including voltage out of range and power cord disconnected).Check voltage. If OK, call your NVIDIA representative for assistance.
Flashing AmberPower supply warning events where the power supply continues to operate; high temp, high power, high current, slow fan.Call your NVIDIA representative for assistance.
OffNo AC power to all power supplies.Call your NVIDIA representative for assistance.

Unit Identification LED

The UID LED is a debug feature, that the user can use to find a particular system within a cluster by turning on the UID blue LED.

To activate the UID LED on a switch system, run:

switch (config) # led MGMT uid on

To verify the LED status, run:

switch (config) # show leds
Module LED Status
--------------------------------------------------------------------------
MGMT UID Blues

To deactivate the UID LED on a switch system, run:

switch (config) # led MGMT uid off

Port LEDs

Each time you press on the Lane Select Button, the Port LEDs display will switch to a different state, as follows:

Lane Select Button States

State

LED Status

Ports LED Indication

0 (Default)

LED is off

4x || 2xA

1

LED is on

4x || 2xB

The port LEDs behavior indicates the ports’ state, as follows:

Port LEDs in InfiniBand System Mode

LED BehaviorDescriptionAction Required
OffLink is down.Check the cable.
Solid GreenLink is up with no traffic.N/A
Flashing Green

Link is up with traffic.

N/A

Solid AmberLink is up.

Wait for the Logical link to raise. Check that the SM is up.

Flashing AmberA problem with the link.Check that the SM is up.

In InfiniBand system mode, the LED indicator, corresponding to each data port, will light orange when the physical connection is established (that is, when the unit is powered on and a cable is plugged into the port with the other end of the connector plugged into a functioning port). When a logical connection is made the LED will change to green. When data is being transferred the light will blink green.