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N5810 fan control
#1
I'm finding unusually high drive temperatures in my N5810, running OS 2.06.02.6.  The drive temps get as high as 77C.  Room ambient is climate controlled at 22C.

The fan control was set on Auto.  Fan speed has mostly been 300 RPM, and increases to 2500 RPM when there's a lot of NAS activity.

I feel that on Auto, the minimum RPM is too low.  However, the other fan options fix the fan speed to 1500, 2500, and 3300 RPM.  The fixed middle and high settings are too loud for continuous use, and the fixed low setting is not fast enough for high NAS activity.

Ideally, I'd like fan speed to be 1500 RPM when the NAS is idle and adaptively increase when there's activity.  Is there a way to limit Auto fan control to not go lower than 1500 RPM?

Also, when I cat /proc/hwm, HDD_TEMP1 and HDD_TEMP2 are both always 0.  Is this normal?  How does Auto fan control monitor drive temps?
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#2
Dear Sir,

1. HDD SAMTY have 2 temp, history higest & current temp, please confirm it is recordable highest or current HDD temp.
2. The FAN RPM base on SYS TEMP on HDD back panel, and HDD_TEMP1 and HDD_TEMP2 will be o or none.
Yvon.
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#3
The SMART drive temps are:

NAS:~# smartctl -a /dev/sda | grep Temp
194 Temperature_Celsius     0x0002   162   162   000    Old_age   Always       -       37 (Min/Max 23/73)
NAS:~# smartctl -a /dev/sdb | grep Temp
194 Temperature_Celsius     0x0002   153   153   000    Old_age   Always       -       39 (Min/Max 22/77)
NAS:~# smartctl -a /dev/sdc | grep Temp
194 Temperature_Celsius     0x0002   150   150   000    Old_age   Always       -       40 (Min/Max 22/75)
NAS:~# smartctl -a /dev/sdd | grep Temp
194 Temperature_Celsius     0x0002   150   150   000    Old_age   Always       -       40 (Min/Max 23/71)
NAS:~# smartctl -a /dev/sde | grep Temp
194 Temperature_Celsius     0x0002   157   157   000    Old_age   Always       -       38 (Min/Max 23/39)

These temperatures are after I changed fan control from Auto to Low.  Drives sda to sdd have been in the NAS for both Auto and Low settings.  Drive sde is a new one and has only been in the NAS with the Low setting.

I noticed that SYS_TEMP is quite a bit lower than the actual drive temperatures:

NAS:~# cat /proc/hwm
Display NCT6775 Info Ver.0.2
Sensor type = 0,AC Loss type = 2
CPU_FAN RPM: 0
SYS_FAN1 RPM: 0
SYS_FAN2 RPM: 0
HDD_FAN1 RPM: 1495
HDD_FAN2 RPM: 0
HDD_FAN3 RPM: 0
HDD_FAN4 RPM: 0
CPU_TEMP: 30
SAS_TEMP: 33
SYS_TEMP: 32
HDD_TEMP1: 0
HDD_TEMP2: 0
ACPWR: 0
EUP: 0

Is there a way to limit Auto fan control to not go lower than 1500 RPM (currently, Auto goes as low as 300 RPM)?
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#4
Dear Sir,

Auto FAN would refer NAS overall condition to adjust the RPM, the HDD SMART temp come from HDD inner, but NAS HDD temp sensor base on HDD back panel, thus HDD SMART temp would higher than NAS HDD temp detected. If you prefer lower HDD temp, here recommend choose FAN speed for LOW/MIDDLE/FULL, but would get higher FAN noise. But the auto fan been tested from thermal lab for a balance between noise & system lifetime, thus recommend choose AUTO is better.
Yvon.
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