Fan Control for NAS

fan-control

#!/bin/bash
# case is closed
echo 0 > /sys/class/hwmon/hwmon2/device/intrusion0_alarm

# space seperated list of hdd's
HDDS="/dev/sdb"

CASE_FAN=0
for disk in $HDDS
do
  HDSTATE=$(hdparm -C $disk)
  HDTEMP=$(smartctl -A $disk | grep Temperature_Celsius | awk '{print $10}')
  if [[ $HDSTATE != *standby* ]]; then
    CASE_FAN=100
  fi
  # echo $disk
  # echo $HDSTATE
  # echo $HDTEMP
done

if [ $HDTEMP -ge 55 2>&- ]; then
  CASE_FAN=255
fi

# echo $CASE_FAN

# Enable manual fan control
echo 1 > /sys/class/hwmon/hwmon2/device/pwm2_enable

# set manual fan control PWM
echo $CASE_FAN > /sys/class/hwmon/hwmon2/device/pwm2

# Set the fan to full speed for one second. If we need the fan to rotate and
# the current RPM is zero
if [ $CASE_FAN -ne 0 2>&- ]; then
  CURRENTRPM=$(sensors | grep fan2 | awk '{print $2}')
  if [ $CURRENTRPM -eq 0 2>&- ]; then
    echo 2 > /sys/class/hwmon/hwmon2/device/pwm2_enable
    sleep 1
    echo 1 > /sys/class/hwmon/hwmon2/device/pwm2_enable
    sleep 1
  fi
fi