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Latest version

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Released:

Control system fan speed by monitoring hard drive temperature

Project description

HDD Fan control is a command line tool to dynamically control fan speed according to hard drive temperature on Linux.

This has 3 benefits:

it allows maintaining your hard drives in the ideal temperature range to have maximum longevity and avoid overheating

Because fans will slow down or stop when not needed:

it minimizes noise generated by the fans
it also minimizes power consumption at the same time

When is this useful?

HDD Fan control is useful when you have one or several hard drives with one or several fans close to them, and do not want to let the motherboard control the fan speed, because it does so either statically, or using a temperature sensor unrelated to the real drive temperature (either on the CPU or on some other place on the motherboard).

The ideal use case is for a NAS with several hard drives, a low power CPU (ie. ARM or Intel Atom) with passive cooling (no fans), and a chassis with fans close to the hard drive. It that case the CPU will generate less heat than the hard drives and it makes sense to control fan speed according to the main heat source.

Features

Can run in daemon mode
Can control several fans and/or several drives with a single invocation
Can automatically spin down drives after a customizable period of inactivity
Can adapt to different fan characteristics
Can be set to stop fans or run them at full speed at customizable temperatures
Can be configured to never set the fans below a certain speed (useful if the fans controlled by HDD Fan control are the only ones available in the chassis)
Can also optionally monitor CPU temperature, and control fan speed accordingly

Prerequisites

A Linux distribution
A least one SATA hard drive, that supports:
- Temperature querying
- Power state querying
A motherboard which:
- exposes to the OS a PWM to control fan speed
- exposes to the OS a sensor to query fan speed

Most motherboards and SATA drives fit these requirements.

Installation

HDD Fan control requires Python >= 3.6.

Distribution packages

Some Linux distributions have a hddfancontrol package available in their repository:

Arch Linux (AUR): hddfancontrol
Fedora: hddfancontrol (thanks to TC01)

From PyPI (with PIP)

If you don't already have it, install pip for Python 3
Install HDD Fan control: pip3 install hddfancontrol
Install hdparm and hddtemp.On Ubuntu and other Debian derivatives: sudo apt-get install hdparm hddtemp.

From source

If you don't already have it, install setuptools for Python 3
Clone this repository: git clone https://github.com/desbma/hddfancontrol
Install HDD Fan control: python3 setup.py install
Install hdparm and hddtemp.On Ubuntu and other Debian derivatives: sudo apt-get install hdparm hddtemp.

To query fan characteristics, you may also need pwmconfig. On Ubuntu and other Debian derivatives, it is part of the fancontrol package, that you can install with sudo apt-get install fancontrol. HDD fancontrol and fancontrol are unrelated. The fancontrol daemon is not needed for HDD fan control to operate. If you use both fancontrol and HDD fancontrol, be careful not to make them control the same fans.

Configuration

A word of caution

The default parameters will run fans at 100% speed at temperatures > 50°C, and run them a 20% speed if < 30°C, which corresponds to the usual recommended drive operating temperature. If you are sure that there are no other components in your system that generate significant heat, if you have other fans to cool down your system, or if you have a case optimized for passive cooling, you can set minimum speed to 0%, which will stop the fans if temperature is below the minimum threshold.

Be aware that a misconfiguration of this tool can lead to a failure to cool down your system properly which can damage components or reduce their lifetime.

Before using HDD Fan control unmonitored for long period of time, I recommend keeping a minimum fan speed for security, and checking that the temperature of your system stays in reasonable range as expected.

Fan configuration

To get the value for the --pwm, --pwm-start-value and --pwm-stop-value parameters, you can either:

Use the -t or --test parameter, which will run some tests and detect the values at which the fans start and stop. However you need to have previously identified the PWM file (the --pwm parameter)
use the pwmconfig tool.

Drive auto spin down

SATA drives can be configured to automatically spin down after a certain period of inactivity, which saves power. If your drives are configured to do so, you may notice that they do not spin down when HDD Fan control is running.This is due to the fact that HDD Fan control will query temperature at fixed interval, which the drive will consider an activity and reset the spin down timeout.To fix that, you can either:

Use a value for the -i/--interval parameter higher than your SATA spin down time (not recommended unless your spin down time is very low, ie < 2 min). In that case you do not need to use hddfancontrol's --spin-down-time switch, because the builtin SATA drive timeout (that you can set for example with hdparm -S XXX command) should take effect.
Use the --spin-down-time parameter that will monitor drive activity and spin it down if inactive, independantly of the SATA feature (recommended)

Keep in mind that spinning down and up a drive repeatedly wears it prematurly, so unless you are in a power constrained environement (ie. laptop), do not set the spin down time too low.

Reading temperature while a drive is in low power state will make it spin up, so HDD Fan control will stop querying temperature in that case, and wait for the drive (which will be cooling down in low power state anyway) to spin up.

Some HGST (previously Hitachi) drives support a special way of querying temperature that does not spin up drives, which HDD Fan control will detect and use, however it still prevents them from spinning down, so the above instructions still apply.

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Command line usage

Run hddfancontrol -h to get full command line reference.

As an example, the command line below will instruct HDD Fan control to:

monitor temperature of drives /dev/sda and /dev/sdb
control fan speed using PWM 2 and 3 in /sys/class/hwmon/hwmon1/device/
start both fans using PWM value 200
consider the fans will stop with PWM value 75
never run the fans below 10% of their maximum speed
check temperature at least every minute
automatically spin down drives if they are inactive for 2 hours (7200 seconds)
run in daemon mode
log what is going on to /var/log/hddfancontrol.log

hddfancontrol -d /dev/sda /dev/sdb -p /sys