The system’s LEDs are an important tool for hardware event notification and troubleshooting.
LEDs Symbols
| Symbol | Name | Description | Normal Conditions |
|---|---|---|---|
| System Status LED | Shows the health of the system. | Green/Flashing green when booting |
| Power Supply Units LEDs | Shows the health of the power supply units. | Green |
| Fan Status LED | Shows the health of the fans. | Green |
| Unit Identifier LED | Lights up on command through the CLI. | Off or blue when identifying a port |
System Status LED
System Status LED - Front Side
| Front Panel | Description |
|---|---|
| The LED in the red rectangle shows the system’s status. |
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
Fan Status LED - Front and Rear Sides
| Front Panel | Description | Rear Panel |
|---|---|---|
 | Both of these LEDs in the red rectangles show the fans’ status. |  |
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. |
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 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. |
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 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. Check that the SM is up. |
| Flashing Amber | A 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.
