Pauven

Thanks Guzzi and aiden, I didn't find that script in my searching. Setting up a cron job in my go script wasn't too hard, but obviously not a one-liner. I looked at the code, and it seems both scripts have a common origin, as many of the variable names are exactly the same, though your script does appear to be newer, more polished and user friendly. Wish I had found it earlier.

NEW VERSION OF THE unraid-fan-speed.sh SCRIPT! NEW v0.5: By Pauven: Added linear PWM logic to slowly ramp speed when fan is between HIGH and OFF. I'm picking up where xamindar left off - thank you xamindar for an excellent script! When I first used the script, I was surprised when the fans instantly changed from the Low speed value to the High speed value when there was only a single degree temperature increase. Looking at the code, I did not see any linear speed ramping logic... so I added it! Here's an example of the new logic, based upon the current values in the script posted below: With an FAN_OFF_TEMP of 30 and a FAN_HIGH_TEMP OF 40, and with a FAN_LOW_PWM of 80 and a FAN_HIGH_PWM of 255, the new logic will perform some math and figure out that there are 9 PWM increments of 19 between 80 and 255, corresponding to temps 31-39. Using the above values, the fan speed would ramp as follows: 31 degrees = 80 PWM 32 degrees = 99 PWM 33 degrees = 118 PWM 34 degrees = 137 PWM 35 degrees = 156 PWM 36 degrees = 175 PWM 37 degrees = 194 PWM 38 degrees = 213 PWM 39 degrees = 232 PWM 40 degrees = 255 PWM The math is automatic, you just need to set the user variables the same as before. Enjoy! -Paul unraid-fan-speed.sh #!/bin/bash # unraid_array_fan.sh v0.5 # v0.1: By xamindar: First try at it. # v0.2: Made a small change so the fan speed on low doesn't fluctuate every time the script is run. # v0.3: It will now enable fan speed change before trying to change it. I missed # it at first because pwmconfig was doing it for me while I was testing the fan. # v0.4: Corrected temp reading to "Temperature_Celsius" as my new Seagate drive # was returning two numbers with just "Temperature". # v0.5: By Pauven: Added linear PWM logic to slowly ramp speed when fan is between HIGH and OFF. # A simple script to check for the highest hard disk temperatures in an array # or backplane and then set the fan to an apropriate speed. Fan needs to be connected # to motherboard with pwm support, not array. # DEPENDS ON:grep,awk,smartctl,hdparm ### VARIABLES FOR USER TO SET ### # Amount of drives in the array. Make sure it matches the amount you filled out below. NUM_OF_DRIVES=15 # unRAID drives that are in the array/backplane of the fan we need to control HD[1]=/dev/sdb HD[2]=/dev/sdc HD[3]=/dev/sdd HD[4]=/dev/sde HD[5]=/dev/sdf HD[6]=/dev/sdg HD[7]=/dev/sdh HD[8]=/dev/sdi HD[9]=/dev/sdj HD[10]=/dev/sdk HD[11]=/dev/sdl HD[12]=/dev/sdm HD[13]=/dev/sdn HD[14]=/dev/sdo HD[15]=/dev/sdp #HD[16]=/dev/sdq #HD[17]=/dev/sdr #HD[18]=/dev/sds #HD[19]=/dev/sdt #HD[20]=/dev/sdu #HD[21]=/dev/sdv #HD[22]=/dev/sdw #HD[23]=/dev/sdx #HD[24]=/dev/sdy # Temperatures to change fan speed at # Any temp between OFF and HIGH will cause fan to run on low speed setting FAN_OFF_TEMP=30 # Anything this number and below - fan is off FAN_HIGH_TEMP=40 # Anything this number or above - fan is high speed # Fan speed settings. Run pwmconfig (part of the lm_sensors package) to determine # what numbers you want to use for your fan pwm settings. Should not need to # change the OFF variable, only the LOW and maybe also HIGH to what you desire. # Any real number between 0 and 255. # # FAN_OFF_PWM=100 # FAN_LOW_PWM=150 # FAN_HIGH_PWM=255 FAN_OFF_PWM=70 FAN_LOW_PWM=80 FAN_HIGH_PWM=255 # Fan device. Depends on your system. pwmconfig can help with finding this out. # pwm1 is usually the cpu fan. You can "cat /sys/class/hwmon/hwmon0/device/fan1_input" # or fan2_input and so on to see the current rpm of the fan. If 0 then fan is off or # there is no fan connected or motherboard can't read rpm of fan. # ARRAY_FAN=/sys/class/hwmon/hwmon1/device/pwm2 ARRAY_FAN=/sys/class/hwmon/hwmon1/device/pwm2 ### END USER SET VARIABLES ### # Program variables - do not modify HIGHEST_TEMP=0 CURRENT_DRIVE=1 CURRENT_TEMP=0 # Linear PWM Logic Variables - do not modify NUM_STEPS=$((FAN_HIGH_TEMP - FAN_OFF_TEMP - 1)) PWM_INCREMENT=$(( (FAN_HIGH_PWM - FAN_LOW_PWM) / NUM_STEPS)) echo "Linear PWM Range is "$FAN_LOW_PWM" to "$FAN_HIGH_PWM" in "$NUM_STEPS" increments of "$PWM_INCREMENT # while loop to get the highest temperature of active drives. # If all are spun down then high temp will be set to 0. while [ "$CURRENT_DRIVE" -le "$NUM_OF_DRIVES" ] do SLEEPING=`hdparm -C ${HD[$CURRENT_DRIVE]} | grep -c standby` if [ "$SLEEPING" == "0" ]; then CURRENT_TEMP=`smartctl -d ata -A ${HD[$CURRENT_DRIVE]} | grep -m 1 -i Temperature_Celsius | awk '{print $10}'` if [ "$HIGHEST_TEMP" -le "$CURRENT_TEMP" ]; then HIGHEST_TEMP=$CURRENT_TEMP fi fi #echo $CURRENT_TEMP let "CURRENT_DRIVE+=1" done echo "Highest temp is: "$HIGHEST_TEMP # Enable speed change on this fan if not already if [ "$ARRAY_FAN" != "1" ]; then echo 1 > "${ARRAY_FAN}_enable" fi # Set the fan speed based on highest temperature if [ "$HIGHEST_TEMP" -le "$FAN_OFF_TEMP" ]; then # set fan to off echo $FAN_OFF_PWM > $ARRAY_FAN echo "Setting pwm to: "$FAN_OFF_PWM elif [ "$HIGHEST_TEMP" -ge "$FAN_HIGH_TEMP" ]; then # set fan to full speed echo $FAN_HIGH_PWM > $ARRAY_FAN echo "Setting pwm to: "$FAN_HIGH_PWM else CURRENT_SPEED=`cat $ARRAY_FAN` # set fan to full speed first to make sure it spins up then change it to low setting. if [ "$CURRENT_SPEED" -lt "$FAN_LOW_PWM" ]; then echo $FAN_HIGH_PWM > $ARRAY_FAN sleep 2 fi # Calculate target fan PWM speed as a linear value between FAN_HIGH_PWM and FAN_LOW_PWM FAN_LINEAR_PWM=$(( ((HIGHEST_TEMP - FAN_OFF_TEMP - 1) * PWM_INCREMENT) + FAN_LOW_PWM)) echo $FAN_LINEAR_PWM > $ARRAY_FAN echo "Setting pwm to: "$FAN_LINEAR_PWM fi