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They're Lower Non-Recoverable (Low NR), Lower Critical (Low CT), Lower Non-Critical (Low NC).

ipmiutil can also set the thresholds. See Supermicro fan control, IPMIUTIL or FEEIPMI? | Page 3 | FreeNAS Community. List the fan thresholds: ipmiutil.exe sensor -N <BMC host> -U <user> ADMIN -Y -c -g fan -v

You're still not root while trying to run privileged operations. Take Introduction to Linux.

There's ipmiutil for Windows, if that's easier.

Network is irrelevant when using IPMI locally and it's only relevant for the BMC when using it remotely.

It really isn't that difficult but you still don't have an IPMI device to talk to (/dev/ipmi0). So... reboot, if practical, to get a clean start and run: reset; sudo modprobe -av ipmi_msghandler ipmi_si ipmi_devintf; lsmod | grep ipmi; dmesg | grep ipmi Show us the output. And it's sudo...

sudo modprobe ipmi_devintf

I just noticed that my X9 mb names the fans with a space ("FAN 1") while my X10 doesn't ("FAN1").

I think it's a lower hard limit no matter what the limit is set to via the BMC. I wonder if it's possible to change the limits in NVRAM without a BMC...

Try for a list of sensors ipmitool -I lanplus -H <ipmi host> -U <user> -P <password> sensor or ipmitool sensor

Seems Supermicro has set a hard lower RPM limit too: Super Micro Computer, Inc. - FAQ Entry

Correct. I got the impression you were trying to lower the fan speed, not that it was ramping.

It's for configuring over the LAN (-I lanplus). You have to replace nas-sol with your own hostname or IP address. You can also run it as root on the server, which saves you some arguments: ipmitool sensor thresh FAN1 lower 300 300 400 ipmitool sensor thresh FAN2 lower 300 300 400 ipmitool...

Lowering a threshold doesn't lower fan RPM, the thresholds are for sensor warnings. The fan controller actually ignores the thresholds, which is why I have to lower them to not trigger the warnings.

The BMC also has three fan profiles. What you're missing are fan thresholds (i.e. warnings) that kick the fans into full speed.

No, those are BMC settings. Look for fan settings in BIOS instead.

As others have pointed out; don't buy SMR drives for a NAS. The WDC Red drives are probably a good pick but I'd buy HGST for faster drives. ECC RAM is a must in a serious NAS. IPMI is really nice to have. An overpowered PSU is inefficient.

The changes are persistent, like all other settings like network and users. I guess there's a risk losing them when upgrading the IPMI firmware.

I've built a Supermicro Avoton NAS with two Noctua NF-A9 PWM and one Noctua NF-A14 PWM. Also had the fan problem but configured the RPM thresholds according to the fan specs like this: ipmitool -I lanplus -H nas-sol -U ADMIN -P ADMIN sensor thresh FAN1 lower 300 300 400 ipmitool -I lanplus -H...