Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document.
Note: Even the most advanced machine translation cannot match the quality of professional translators.
Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Displaying the Fan Status
Why Can I Not Obtain Fan Information?
On a device that uses natural heat dissipation and has no fan module or built-in fan, the display fan command returns no fan information.
<HUAWEI> display fan
Info: There is no fan.
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
How Can I View Built-in Fan Information?
To view information about built-in fans, run the display fan command. A device has no fan subcard but has built-in fans if both
of the following situations occur:
- No fan information is displayed when you run the display device command.
- The Online field displays Present when you run the display fan command.
<HUAWEI> display device
S5720-52X-SI-AC's Device status:
Slot Sub Type Online Power Register Status Role
-------------------------------------------------------------------------------
0 - S5720-52X-SI Present PowerOn Registered Normal Master
<HUAWEI> display fan ----------------------------------------------------------------------------------------- Slot FanID Online Status Speed Mode Airflow Auto Min-Speed ----------------------------------------------------------------------------------------- 0 1 Present Normal 40% AUTO Side-to-Side 20%