RN314 Fan Speed

I know this thread is a bit old, however I thought I would update it.
I originally had a ReadyNAS 104 and got fan control working (based on the thread by moseleypj (Sat Dec 28, 2013 3:51 pm) http://www.readynas.com/forum/viewtopic.php?f=7&t=71587&start=15). On the weekend I bought a ReadyNAS 314 and tried applying the scripts to the 314. Unfortunately it didnt work. However after some tweaking I have been successful getting control of the fans :D

The problem from the 104 script was the location of the sensors and fan control files.Slight tweak to this and we are in business with a script that is adjustable to your needs. The code is as follows:

Create a file called fanoveride at /root/ with the following content:

    #!/bin/bash
	
    ## Variables ##
    FANPWMPATH=/sys/devices/platform/it87.2560/pwm1
    FANSPEEDPATH=/sys/devices/platform/it87.2560/fan1_input
    CORETEMPPATH=/sys/devices/platform/it87.2560/temp1_input
    MAXFAN=100   # Maximum operable speed
    MINFAN=0     # Minimum operable speed
    MINPWM=75    # PWM Limit
    MAXPWM=255   # PWM Limit
    MINTEMP=35   # Min temp -> Fan slowest
    MAXTEMP=70   # 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/it87.2560/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
    ###################################################################

Create a file called fanoveride at /etc/init.d with the following content:

#!/bin/sh
### BEGIN INIT INFO
# Provides: FanOveride
# Required-Start: $local_fs $network $named $time $syslog
# Required-Stop: $local_fs $network $named $time $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Description: FanOveride overides the default ReadyNAS fan control
### END INIT INFO

SCRIPT=~/fanoveride
RUNAS=root

PIDFILE=/var/run/fanoveride.pid
LOGFILE=/var/log/fanoveride.log

start() {
if [ -f /var/run/$PIDNAME ] && kill -0 $(cat /var/run/$PIDNAME); then
echo 'Service already running' >&2
return 1
fi
echo 'Starting service.' >&2
local CMD="$SCRIPT &> \"$LOGFILE\" & echo \$!"
su -c "$CMD" $RUNAS > "$PIDFILE"
echo 'Service started' >&2
}

stop() {
if [ ! -f "$PIDFILE" ] || ! kill -0 $(cat "$PIDFILE"); then
echo 'Service not running' >&2
return 1
fi
echo 'Stopping service.' >&2
kill -15 $(cat "$PIDFILE") && rm -f "$PIDFILE"
echo 'Service stopped' >&2
}

uninstall() {
echo -n "Are you really sure you want to uninstall this service? That cannot be undone. [yes|No] "
local SURE
read SURE
if [ "$SURE" = "yes" ]; then
stop
rm -f "$PIDFILE"
echo "Notice: log file is not be removed: '$LOGFILE'" >&2
update-rc.d -f <NAME> remove
rm -fv "$0"
fi
}

case "$1" in
start)
start
;;
stop)
stop
;;
uninstall)
uninstall
;;
retart)
stop
start
;;
*)
echo "Usage: $0 {start|stop|restart|uninstall}"
esac

Set permissions for these files to 755 and install the service:

chmod +x /root/fanoveride
chmod +x /etc/init.d/fanoveride
update-rc.d fanoveride defaults

The service will then start at next reboot of the NAS however you can use the following manual controls:

service fanoveride start
service fanoveride stop

Within 10 minutes I managed to drop my CPU temp from 54c to 44c and hard drives from 44c to 35c.

Remember if copy and pasting the above code you will need to remove the carriage returns that will be shown in Linux. The easiest way to add these scripts (my personal preference) is to enable SSH on the NAS, use NotePad ++ to paste the text in to a new file without the carriage returns at end of line, and use Bitvise SSH to copy the files over to the NAS

Hope that helps others