Custom silent fan profile.

The script will check the CPU temperature ever 2 seconds. Fans will be set to manual and low RPM unless the temperature reaches the UPPER_TEMP value. Upon reaching the upper value, the iDRAC settings kick in and manual fan control is disabled.

For this to work, the script relies on the ipmitool binary. Make sure to install the ipmitool

apt update
apt install ipmitool

Customizations can be applied to the scripts.

1. Update the SENSOR_ID value in the start_fan_supervisor.sh script. To get your sensor id run this after installing the ipmitool.

ipmitool sdr type temperature

Sample output:

Inlet Temp		| 04h | ok  |  7.1 | 26 degrees C
Temp			| 0Eh | ok  |  3.1 | 49 degrees C
Temp			| 0Fh | ok  |  3.2 | 52 degrees C

Select the sensor id to be monitored and update the SENSOR_ID value.

2. Modify the scripts to your needs.

3. Copy the scripts and the service files in their appropriate directories

/opt/fan_supervisor/start_fan_supervisor.sh
/opt/fan_supervisor/stop_fan_supervisor.sh
/etc/systemd/system/fan_supervisor.service

4. Reload systemd

systemctl daemon-reload

5. Enable the service to start on boot

systemctl enable fan_supervisor

6. Start the service for current session or reboot

systemctl start fan_supervisor