SOLVED RPM Fan problem

[ricky_198]

System Info:
FreeNAS version: FreeNAS-9.10-STABLE-201605240427
Case: Fractal Design Node-804
Motherboard: Supermicro X10SL7-F
CPU: Intel(R) Xeon(R) CPU E3-1230 v3 @ 3.30GHz
RAM Size: 32GB/Crucial CT2KIT102472BD160B
PSU: 450w-Seasonic-G-Series

My case is fitted with 8 x Silent Series R2 120mm case fans. My CPU stock fan is connected to FAN1.

The remainder of the fans are connected by Akasa fan splitter's which connects 2 of the fans to one fan header on the motherboard from FAN2, FAN 3, FAN4 and FANA.

I have followed the "Supermicro-X10-X11-Motherboard-Faq" thread along with reading the 2 dedicated threads on this subject. I have therefore adjusted my fan thresholds to more reasonable values.

Code:

CPU Temp         | 32.000     | degrees C  | ok    | 0.000     | 0.000     | 0.000     | 95.000    | 100.000   | 100.000
System Temp      | 35.000     | degrees C  | ok    | -9.000    | -7.000    | -5.000    | 80.000    | 85.000    | 90.000
Peripheral Temp  | 37.000     | degrees C  | ok    | -9.000    | -7.000    | -5.000    | 80.000    | 85.000    | 90.000
PCH Temp         | 41.000     | degrees C  | ok    | -11.000   | -8.000    | -5.000    | 90.000    | 95.000    | 100.000
VRM Temp         | 34.000     | degrees C  | ok    | -9.000    | -7.000    | -5.000    | 95.000    | 100.000   | 105.000
DIMMA1 Temp      | 29.000     | degrees C  | ok    | 1.000     | 2.000     | 4.000     | 80.000    | 85.000    | 90.000
DIMMA2 Temp      | 30.000     | degrees C  | ok    | 1.000     | 2.000     | 4.000     | 80.000    | 85.000    | 90.000
DIMMB1 Temp      | 29.000     | degrees C  | ok    | 1.000     | 2.000     | 4.000     | 80.000    | 85.000    | 90.000
DIMMB2 Temp      | 28.000     | degrees C  | ok    | 1.000     | 2.000     | 4.000     | 80.000    | 85.000    | 90.000
FAN1             | 2000.000   | RPM        | ok    | 100.000   | 200.000   | 300.000   | 2500.000  | 2600.000  | 2700.000
FAN2             | 1200.000   | RPM        | nc    | 100.000   | 200.000   | 300.000   | 1200.000  | 1300.000  | 1400.000
FAN3             | 1200.000   | RPM        | ok    | 100.000   | 200.000   | 300.000   | 1200.000  | 1300.000  | 1400.000
FAN4             | 1200.000   | RPM        | nc    | 100.000   | 200.000   | 300.000   | 1200.000  | 1300.000  | 1400.000
FANA             | 1200.000   | RPM        | nc    | 100.000   | 200.000   | 300.000   | 1200.000  | 1300.000  | 1400.000
Vcpu             | 1.791      | Volts      | ok    | 1.242     | 1.260     | 1.395     | 1.899     | 2.088     | 2.106
VDIMM            | 1.320      | Volts      | ok    | 1.096     | 1.124     | 1.201     | 1.642     | 1.719     | 1.747
12V              | 11.949     | Volts      | ok    | 10.164    | 10.521    | 10.776    | 12.918    | 13.224    | 13.224
5VCC             | 5.000      | Volts      | ok    | 4.225     | 4.380     | 4.473     | 5.372     | 5.527     | 5.589
3.3VCC           | 3.329      | Volts      | ok    | 2.804     | 2.894     | 2.969     | 3.554     | 3.659     | 3.689
VBAT             | 2.970      | Volts      | ok    | 2.400     | 2.490     | 2.595     | 3.495     | 3.600     | 3.690
AVCC             | 3.329      | Volts      | ok    | 2.399     | 2.489     | 2.594     | 3.494     | 3.599     | 3.689
VSB              | 3.269      | Volts      | ok    | 2.399     | 2.489     | 2.594     | 3.494     | 3.599     | 3.689
Chassis Intru    | 0x0        | discrete   | 0x0000| na        | na        | na        | na        | na        | na

Even after re-starting the server, power cycling, resetting the BMC, re-flashing the Management Engine, the RPM of the fans still jump from 1200 to almost double and insane values the values (2300 R.P.M/4800 R.P.M).

I've set the fan speeds via the webgui to optimal, standard and full speeds as well as made sure I have latest BIOS and IPMI firmware to the latest firmware. Still the same problem occurs.

I'm really not sure what else I can try to stop the RPM jumping. Not sure if it's the fans themselves, or a setting I've overlooked. Would really appreciate any help.

 

[Dice]

Can you provide a link to the splitters?

 

[ricky_198]

These are the splitter(s) I'm currently using: http://www.akasa.co.uk/search.php?seed=AK-CBFA04-15

 

[Ericloewe]

My case is fitted with 8 x Silent Series R2 120mm case fans. My CPU stock fan is connected to FAN1.

Well, there's your problem. Those aren't PWM fans, they only have three pins.

Server boards, for a few years now, have only supported fan speed control with PWM fans.

 

[ricky_198]

Thanks for the clarification :)
I figured since the board can support 3-pin fans (w/o speed control), they would still run at full RPM without jumping to absurd values. I'l start replacing these with PWM fans which I'm positive will fix my problem.
Thanks again!

 

[Ericloewe]

Thanks for the clarification :)
I figured since the board can support 3-pin fans (w/o speed control), they would still run at full RPM without jumping to absurd values. I'l start replacing these with PWM fans which I'm positive will fix my problem.
Thanks again!

Double values probably mean that the fans themselves are pure crap and can't output a proper tachometer signal.