TheCUS N5550 video howto for DSM 6.2

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  • 1 month later...

Hi gquiring,


Thanks for showing how to install DSM on the N5550. I just installed DSM on my NAS.

Have you managed to control the fan-speed? Because the thing is blowing at full speed.

I have two N5550's and this way, they will produce a lot of noise....




Edited by Arno_0071
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The only issue that I don't like about those fan mods are is how long is it going to last before a DSM update comes along and steps on the changes that were made?  

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4 hours ago, Bogey said:

I’ll post the steps from the above thread that work for me. They’ve survived a couple of updates so far (also from 6.1 to 6.2).

Please read everything first before doing the actual stuff!


I logged in as root: sudo -i

Then, from the thread above, I followed post #36 by 'gdw1963'.


* I did not edit the .profile

* I created file in /volume1/@optware/etc/init.d/


Do note that running pwmconfig will overwrite the contents of /etc/fancontrol.

The contents of my /etc/fancontrol are:

# Configuration file generated by pwmconfig, changes will be lost
FCTEMPS=hwmon1/device/pwm1=hwmon1/device/temp2_input hwmon1/device/pwm3=hwmon1/device/temp2_input
FCFANS=hwmon1/device/pwm1=hwmon1/device/fan1_input hwmon1/device/pwm3=hwmon1/device/fan3_input
MINTEMP=hwmon1/device/pwm1=20 hwmon1/device/pwm3=20
MAXTEMP=hwmon1/device/pwm1=60 hwmon1/device/pwm3=60
MINSTART=hwmon1/device/pwm1=150 hwmon1/device/pwm3=150
MINSTOP=hwmon1/device/pwm1=70 hwmon1/device/pwm3=70
MINPWM=hwmon1/device/pwm1=70 hwmon1/device/pwm3=70
MAXPWM=hwmon1/device/pwm1=255 hwmon1/device/pwm3=255

As you can see I assigned the temp and fan monitors different than gdw1963 so the result of running sensors are:

It's summer now and the temperature outside is near 25 degrees C, inside it's a little cooler: 23 degrees C. The fans are NOT rotating at max speed.

Current disk temperatures (not shown but can be found in Storage Manager >HDD/SDD > Health info) are 34-35 degrees C.

root@N7510:~# sensors
Adapter: ISA adapter
Core 0:       +42.0 C  (crit = +100.0 C)
Core 1:       +42.0 C  (crit = +100.0 C)

Adapter: ISA adapter
in0:          +1.20 V  (min =  +1.93 V, max =  +2.28 V)  ALARM
in1:          +1.54 V  (min =  +0.44 V, max =  +0.07 V)  ALARM
in2:          +3.02 V  (min =  +1.86 V, max =  +2.38 V)  ALARM
in3:          +2.84 V  (min =  +0.65 V, max =  +2.72 V)  ALARM
in4:          +2.03 V  (min =  +2.38 V, max =  +0.54 V)  ALARM
in5:          +1.07 V  (min =  +2.65 V, max =  +0.48 V)  ALARM
in6:          +2.51 V  (min =  +2.39 V, max =  +0.02 V)  ALARM
3VSB:         +1.66 V  (min =  +4.80 V, max =  +2.59 V)  ALARM
Vbat:         +3.29 V  
fan1:        1464 RPM  (min =   49 RPM)
fan3:        1480 RPM  (min =   19 RPM)
temp1:        +35.0 C  (low  = -102.0 C, high = +68.0 C)  sensor = thermal diode
temp2:        +38.0 C  (low  = +58.0 C, high = +53.0 C)  sensor = thermal diode
temp3:        +33.0 C  (low  = -68.0 C, high = +52.0 C)  sensor = thermal diode
intrusion0:  ALARM


I did not do the last steps, after the last 'shutdown -h now' I was done.

If everything turns out well your NAS reboots, fans are high and then after a while they go quiet.


Do note, that I have enabled Smart Fan Control in BIOS, I enabled it AFTER doing the pwm settings, first you just should have them enabled.:

Smart CPU Fan - Enabled
Start temp: 30 degrees C.
Smart AUX Fan - Enabled
Start temp: 30 degrees C.

Good luck!

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