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ReadyNAS RN 104 Automatic FAN-Control
Hi All, I have a Big Problem with my New (2 Weeks old) ReadyNAS 104. When i have a look at the WEB-UI under the Performance TAB i see the FAN is always running at only ~875 rpm. After a fresh st...
I knocked together a little bash script to try controlling the fan speeds. It's working for me in SSH at the moment but I haven't had chance to 'tune' it. It's below for those who're interested.
#!/bin/bash
## Variables ##
FANPWMPATH=/sys/devices/platform/mv64xxx_i2c.0/i2c-0/0-003e/pwm1
FANSPEEDPATH=/sys/devices/platform/mv64xxx_i2c.0/i2c-0/0-003e/fan1_input
CORETEMPPATH=/sys/devices/platform/axp-temp.0/temp1_input
MAXFAN=100 # Maximum operable speed
MINFAN=0 # Minimum operable speed
MINPWM=75 # PWM Limit
MAXPWM=255 # PWM Limit
MINTEMP=45 # Min temp -> Fan slowest
MAXTEMP=60 # Max temp -> Fan fastest
NEWSPEED=50 # Initial fan speed (%)
## Functions ##
function getReadings {
FANPWM=$(cat $FANPWMPATH)
FANSPEED=$(cat $FANSPEEDPATH)
CORETEMP=$(cat $CORETEMPPATH)
}
function setFanSpeed {
if [ $NEWSPEED -lt $MINFAN ]; then
NEWSPEED=$MINFAN
fi
if [ $NEWSPEED -gt $MAXFAN ]; then
NEWSPEED=$MAXFAN
fi
NEWPWM=$(expr $MAXPWM - $MINPWM)
NEWPWM=$(expr $NEWPWM \* $NEWSPEED)
NEWPWM=$(expr $NEWPWM / 100)
NEWPWM=$(expr $NEWPWM + $MINPWM)
echo $NEWPWM > /sys/devices/platform/mv64xxx_i2c.0/i2c-0/0-003e/pwm1
}
function calcFanPercent {
TEMPRAN=$(expr $MAXTEMP - $MINTEMP)
TEMPREL=$(expr $CORETEMP - $MINTEMP)
TEMPREL=$(expr $TEMPREL \* 100)
TEMPPER=$(expr $TEMPREL / $TEMPRAN)
NEWSPEED=$TEMPPER
}
###################################################################
echo "Automatically controlling fan speed..."
while true
do
getReadings
echo "Temp: $CORETEMP C FAN: $NEWSPEED% [$FANSPEED RPM] [$FANPWM]"
calcFanPercent
setFanSpeed
sleep 10
done
###################################################################
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