How Can I Adjust the Fan Speed?

You are advised to use intelligent fan speed adjustment. Do not manually change the fan speed; otherwise, loud fan noises are generated and low fan speed may cause device faults. If you must change the fan speed, contact Huawei technical support.

Intelligent Fan Speed Adjustment

Whether switches have fans depends on device models. Some devices have fan subcards, some devices have built-in fans, and some devices do not have fans and use natural heat dissipation.

Devices that have fan subcards or built-in fans use the intelligent fan speed adjustment policy by default. That is, fans automatically adjust the fan speed based on the current device temperature.

Reason Why a Fan Does Not Rotate and Solution

If a fan of a device does not rotate, the following situations may have occurred:

Fan blades are blocked: Clean the fan blades.
The fan is not installed properly: Ensure that the fan is connected securely.
The fan has a hardware fault. If other fans are rotating or a new fan can rotate after being installed, the fan experiences a hardware fault and needs to be replaced.

How to Increase the Fan Speed

(Recommended) Run the set fan speed-adjust threshold minus command to set the temperature thresholds for fan speed adjustment so that you can increase the fan speed.
(Used with caution) Run the temperature threshold command to set the temperature alarm threshold Upper(C) to be smaller than the current device temperature Current(C). Subsequently, fans rotate at full speed.

This configuration enables fans to rotate at full speed, and so may generate loud fan noises and a high temperature alarm. Therefore, you are advised to use this command under the instruction of technical support personnel.

Commands Related to Fan Speed

View the fan speed.

<HUAWEI> display fan
-----------------------------------------------------------------------------------------
 Slot  FanID   Online    Status    Speed     Mode     Airflow      Auto Min-Speed
-----------------------------------------------------------------------------------------
 0     1       Present   Normal    30%       Auto     Side-to-Side 20%

View the temperature thresholds for fan speed adjustment.

<HUAWEI> display fan speed-adjust threshold minus
 -----------------------------------------------------------
 Slot     Default Range  Current Range  Speed Rate Adjusted
-----------------------------------------------------------
  0          46 - 50         41 - 45        30%-100%

Set the temperature thresholds for fan speed adjustment.

<HUAWEI> system-view
[HUAWEI] set fan speed-adjust threshold minus 10

View the device temperature thresholds. When the device temperature exceeds the upper threshold, fans on the device rotate at full speed.

<HUAWEI> display temperature all
-------------------------------------------------------------------------------
 Slot  Card  Sensor Status    Current(C) Lower(C) Lower     Upper(C) Upper
                                                  Resume(C)          Resume(C)
-------------------------------------------------------------------------------
 0     NA    NA     Normal     55        0        4         65       61

Set the device temperature thresholds. When the device temperature exceeds the upper threshold, fans on the device rotate at full speed.
```
<HUAWEI> system-view
[HUAWEI] temperature threshold slot all lower-limit 0 upper-limit 45
```