SuperMicro X9 Heavy IO Fan question

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texmurphy

New Member
Oct 18, 2021
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Hello,

I'm sorry for yet another Supermicro X9 series fan question, but i've run into an odd problem.

I have two fans connected to Fan 2 and 6, and two to Fan A and B. I would like my Fan A&B to run at 75% and my CPU Fans which are Fan 2 & 6 to run at something low unless needed. Ie standard profile for those fans. From my understanding Heavy IO mode achieves exactly that.

When I powered on the machine, it worked exactly that way. All was good. Then I set my fans to full speed mode for a bit, and then brought them down to 'Heavy IO' and since then it will not yield and runs all fans CPU and IO zones at about 90%. There are no temp alarms, no fan alarms of being knocked down, I just don't understand it. Tried resetting the IPMI device. Any ideas why it does that?

Thanks!
 
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texmurphy

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Oct 18, 2021
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I used ipmitool and checked the temps and they're all marked as 'ok' and seem reasonable... 30-50C depending on the component

EDIT: screenshot (before FAN 2 was at ~ 2000, FAN 6 ~ 1800 and FANs A&B were at 1600)
1665503037713.png
 
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RolloZ170

Well-Known Member
Apr 24, 2016
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texmurphy said:
I have two fans connected to Fan 2 and 6, and two to Fan A and B. I would like my Fan A&B to run at 75% and my CPU Fans which are Fan 2 & 6 to run at something low unless needed
Click to expand...
FAN-A/B is for add-on card or chassis fan and is controlled by system
temp. FAN 1~6 is controlled by CPU temp.

FAQ Entry | Online Support | Support - Super Micro Computer, Inc.

Frequently Asked Questions
www.supermicro.com

FANA is for add-on card and controlled by system temperature. FAN1~4 is controlled by CPU temperature. CPU Heatsink fan should not be connected to FAN-A. CPU Heatsink fan can be connected to FAN-1. Chassis fans can be connected to FAN-2~4 or FAN-A.

FAQ Entry | Online Support | Support - Super Micro Computer, Inc.

Frequently Asked Questions
www.supermicro.com
 
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RolloZ170

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Apr 24, 2016
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in general, if you keep temps sensor values low, FAN stay at low RPMs.
check with ipmiutil(SM tool) whats going on.
ipmiutil sensors list sth22.jpg
 
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texmurphy

New Member
Oct 18, 2021
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RolloZ170 said:
FAN-A/B is for add-on card or chassis fan and is controlled by system
temp. FAN 1~6 is controlled by CPU temp.

FAQ Entry | Online Support | Support - Super Micro Computer, Inc.

Frequently Asked Questions
www.supermicro.com

FANA is for add-on card and controlled by system temperature. FAN1~4 is controlled by CPU temperature. CPU Heatsink fan should not be connected to FAN-A. CPU Heatsink fan can be connected to FAN-1. Chassis fans can be connected to FAN-2~4 or FAN-A.

FAQ Entry | Online Support | Support - Super Micro Computer, Inc.

Frequently Asked Questions
www.supermicro.com
Click to expand...
I’m not sure I understand what you’re trying to tell me.
My CPU fans ARE connected to Fan 2 and 6.
I have two chassis fans one intake and one exhaust connected to fans A and B respectively.
 
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i386

Well-Known Member
Mar 18, 2016
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texmurphy said:
I have two chassis fans one intake and one exhaust connected to fans A and B respectively.
Click to expand...
What chassis are you using?
If you have only two fans in it I would say connect them to the fan headers with a number (cpu controlled), that way they spin faster when cpu temps increase and remove the heat from the chassis faster.
 
R

RolloZ170

Well-Known Member
Apr 24, 2016
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1,637
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texmurphy said:
I have two fans connected to Fan 2 and 6, and two to Fan A and B. I would like my Fan A&B to run at 75% and my CPU Fans which are Fan 2 & 6 to run at something low unless needed. Ie standard profile for those fans. From my understanding Heavy IO mode achieves exactly that.
Click to expand...
Standard – Provide standard fan speed
Full Speed – Maximum cooling
Optimal – Balanced fan speed and power consumption <<<<<<<<<<<<<<<<
Heavy I/O – Boost cooling to the add-on card zone

edit:
the BMC/IPMI can set the FAN PWM to 30%/50%/100% only.
 
Last edited:
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jasonsansone

Member
Sep 15, 2020
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Why not use a custom script as previously linked to? You can control each zone (Fan 1-6, Fan A-C) based on whatever sensor or data point you choose and set the curve to your heart's content.

Example for X9
 
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