LED Notifications

NVIDIA NVLink SGXLS10 Switch Systems User Manual

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

LEDs Symbols

Symbol

Name

Description

Normal Conditions

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System Status LED

Shows the health of the system.

Green/Flashing green when booting

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Power Supply Units LEDs

Shows the health of the power supply units.

Green

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Fan Status LED

Shows the health of the fans.

Green

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*

Unit Identifier LED

Lights up on command through the CLI.

Off or blue when identifying a port

System Status LED - Front Side

Front Panel

Description

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

Important

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 Behavior

Description

Action Required

Solid Green

The system is up and running normally.

N/A

Flashing Green

The 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 Amber

Major 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 - Front and Rear Sides

Front Panel

Description

Rear Panel

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

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Fan Status Front LED Assignments

LED Behavior

Description

Action Required

Solid Green

All fans are up and running.

N/A

Solid Amber

Error, one or more fans are not operating properly.

The faulty FRUs should be replaced.

Fan Status Rear LED Assignments (One LED per Fan)

LED Behavior

Description

Action Required

Solid Green

A 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.

Important

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.

The Lane Select LED is nonfunctional in the system and its status should be disregarded.

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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

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Rear Side Panel

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Power Supply Unit Status Front LED Assignments

LED Behavior

Description

Action Required

Solid Green

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

N/A

Solid Amber

One 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 Behavior

Description

Action Required

Solid Green

All 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.

Amber

AC 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 Amber

Power supply warning events where the power supply continues to operate; high temp, high power, high current, slow fan.

Call your NVIDIA representative for assistance.

Off

No AC power to all power supplies.

Call your NVIDIA representative for assistance.

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:

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switch (config) # led MGMT uid on

To verify the LED status, run:

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

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

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switch (config) # led MGMT uid off

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

Port LEDs

LED Behavior

Description

Action Required

Off

Link is down.

Check the cable.

Solid Green

Link is up with no traffic.

N/A

Flashing Green

Link is up with traffic.

N/A

Solid Amber

Link is up.

Wait for the logical link to raise. Make sure that the fabric manager is up.

Flashing Amber

A problem with the link.

Check the cable, and make sure that the fabric manager is up.

In the NVLink4 system mode, the LED indicator, corresponding to each data port, will light amber 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 color will change to green. When data is being transferred, the light will blink green.

Each OSFP port has two port LEDs, and a total of four logical NVLink4 ports connected. Therefore, each two LEDs per OSFP connector represent two logical links.

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© Copyright 2023, NVIDIA. Last updated on Dec 13, 2023.