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https://github.com/petersulyok/smfc

Super Micro Fan Control
https://github.com/petersulyok/smfc

fancontroller ipmi linux supermicro systemd-service

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Super Micro Fan Control

Host: GitHub
URL: https://github.com/petersulyok/smfc
Owner: petersulyok
License: gpl-3.0
Created: 2021-09-16T22:58:16.000Z (about 3 years ago)
Default Branch: main
Last Pushed: 2024-09-09T19:34:31.000Z (3 months ago)
Last Synced: 2024-09-10T09:33:05.732Z (3 months ago)
Topics: fancontroller, ipmi, linux, supermicro, systemd-service
Language: Python
Homepage:
Size: 1.49 MB
Stars: 174
Watchers: 7
Forks: 14
Open Issues: 15
Metadata Files:
- Readme: README.md
- License: LICENSE

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README

# smfc
[![Tests](https://github.com/petersulyok/smfc/actions/workflows/test.yml/badge.svg)
](https://github.com/petersulyok/smfc/actions/workflows/tests.yml) [![Codecov](https://codecov.io/gh/petersulyok/smfc/branch/main/graph/badge.svg)
](https://app.codecov.io/gh/petersulyok/smfc) [![Issues](https://img.shields.io/github/issues/petersulyok/smfc)
](https://github.com/petersulyok/smfc/issues)

Super Micro fan control for Linux (home) servers.

## TL;DR

This is a `systemd service` running on Linux and is able to control fans in CPU and HD zones with the help of IPMI on Super Micro X10-X13 (and some X9) motherboards.

You can also run `smfc` in docker, see more details in [Docker.md](Docker.md).

### 1. Prerequisites
- a Super Micro motherboard with a BMC chip (i.e. ASPEED AST2400/2500/2600)
- Python 3.7+
- Linux OS with:
- `systemd` package
- `coretemp` kernel module for Intel(R) CPUs
- `k10temp` kernel module for AMD(R) CPUs
- `drivetemp` kernel module (kernel version 5.6+ required) modules for SATA hard disks
- `bash`
- `ipmitool`
- optional: `smartmontools` for the *standby guard* feature
- optional: `hddtemp` for the SAS/SCSI disks

### 2. Installation and configuration
1. Set up the IPMI threshold values for your fans (see script `ipmi/set_ipmi_threshold.sh`).
2. Optional: enable advanced power management features for your CPU and SATA hard disks for lower power consumption, heat generation and fan noise.
3. Load kernel modules (`coretemp/k10temp` and `drivetemp`).
4. Install the service with running the script `install.sh`.
5. Edit the configuration file `/opt/smfc/smfc.conf` and command line options in `/etc/default/smfc`.
6. Start the `systemd` service
7. Check results in system log
8. Leave a feedback in [issue #19](https://github.com/petersulyok/smfc/issues/19)

## Details
### 1. How does it work?
This service was planned for Super Micro motherboards installed in computer chassis with two independent cooling systems employing separate fans. In IPMI terms these are called:
- CPU zone with fans: FAN1, FAN2, ...
- HD or peripheral zone with fans: FANA, FANB, ...

Please note: the fan assignment to zones is predefined in IPMI, and it cannot be changed! On the other hand `smfc` implements a feature, called [*Swapped zones*](https://github.com/petersulyok/smfc?tab=readme-ov-file#3-swapped-zones), in order to make the use of the fans more suitable.

In this service a fan control logic is implemented for both zones which can:

1. read the zone's temperature from Linux kernel
2. calculate a new fan level based on the user-defined control function and the current temperature value of the zone
3. set up the new fan level through IPMI in the zone

The fan control logic can be enabled and disabled independently per zone. In the zone all fans will have the same rotational speed. The user can configure different temperature calculation method (e.g. minimum, average, maximum temperatures) in case of multiple heat sources in a zone.

Please note that `smfc` will set all fans back to 100% speed at service termination in order to avoid overheating!

#### 2. User-defined control function
The user-defined parameters (see configuration file below for more details) create a function where a temperature interval is being mapped to a fan level interval.

The following five parameters will define the function in both zones:

min_temp=
max_temp=
min_level=
max_level=
steps=

With the help of this function `smfc` can map any new temperature measurement value to a fan level. Changing the fan rotational speed is a very slow process (i.e. it could take seconds depending on fan type and the requested amount of change), so we try to minimize these kinds of actions. Instead of setting fan rotational speed continuously we define discrete fan levels based on `steps=` parameter.

In order to avoid/minimize the unnecessary change of fan levels the service employs the following steps:

1. When the service adjusts the fan rotational speed then it always applies a delay time defined in configuration parameter `[IPMI] fan_level_delay=` in order to let the fan implement the physical change.
2. There is a sensitivity threshold parameter (`sensitivity=`) for the fan control logic. If the temperature change is below this value then the service will not react at all.
3. The configuration parameter `polling=` defines the frequency of reading zone's temperature. The bigger polling time in a zone the lower frequency of fan speed change.

#### 3. Swapped zones
This feature is useful if you need more fans for the HD zone since Super Micro motherboards have more fan connectors in the CPU zone, typically.
Enabling this feature will connect fans `FAN1, FAN2, ...` to the HD zone and fans `FANA, FANB, ...` to the CPU zone. The feature can be enabled with `[IPMI] swapped_zones=True` configuration parameter, in default it is disabled.

**Please note:** when you enable this feature your task is only to swap fan connectors between zones on your motherboard, the rest of the configuration file will not be impacted (i.e. the zone sections will remain the same).

#### 4. Standby guard
For HD zone an additional optional feature was implemented, called *Standby guard*, with the following assumptions:

- SATA hard disks are organized into a RAID array
- the RAID array will go to standby mode recurrently

This feature is monitoring the power state of SATA hard disks (with the help of the `smartctl`) and will put the whole array to standby mode if a few members are already stepped into that. With this feature we can avoid a situation where the array is partially in standby mode while other members are still active.

#### 5. Hard disk compatibility
The `smfc` service was originally designed for `SATA` hard drives, but from `3.0` version it is also compatible with `NVME` and `SAS/SCSI` disks. The following table summarizes how the temperature is read for different disk types:

| Disk type | Temperature source | Kernel module | Command |
|------------|----------------------|---------------|-----------|
| `SATA` | Linux kernel (HWMON) | `drivetemp` | - |
| `NVME` | Linux kernel (HWMON) | - | - |
| `SAS/SCSI` | `hddtemp` | - | `hddtemp` |

Some additional notes:

- For `NVME` SSDs no kernel driver will be loaded the kernel itself can handle this disk type
- For `SATA` disks the `drivetemp` kernel module should be loaded (this is the fastest way to read disk temperature and the kernel module can report the temperature during sleep mode!)
- For `SAS/SCSI` disks the `hddtemp` command will be used to read disk temperature (NO daemon mode is required for `hddtemp`!)
- Different disks types can be mixed in `hd_names=` configuration parameter but the power management (standy mode) and *Standby guard* feature will not be supported in this case.
- Although `smfc` can handle NVME SSDs, it is NOT RECOMMENDED to mix NVME SSD and SATA/SCSI disks in `hd_names=` parameters, because they are operating in quite different temperature intervals (e.g. 30-40C vs 40-80C).
- The service can identify the disk types automatically based on the tags (`ata-`/`-SATA`, `nvme-` and `scsi-`)

### 6. Super Micro compatibility
Originally this software was designed to work with Super Micro X10 and X11 motherboards with a BMC chip (i.e. ASPEED AST2400/2500) and IPMI functionality.

In case of X9 motherboards the compatibility is not guaranteed, it depends on the hardware components of the motherboard (i.e. not all X9 motherboards employ BMC chip).

The earlier X8 motherboards are NOT compatible with this software. They do not implement `IPMI_FULL` mode, and they cannot control fan levels how it is implemented in `smfc`.

X13 motherboards (with AST2600 BMC chips) seem to be compatible with smfc (see mode details in [issue #33](https://github.com/petersulyok/smfc/issues/33) about an X13SAE-F motherboard).
Fan control and `IPMI_FULL` mode are working properly. The only difference is in using thresholds, AST2600 implements only `Lower Critical` threshold, so setting up thresholds is different in this case.

Feel free to create a short feedback in [issue #19](https://github.com/petersulyok/smfc/issues/19) on your compatibility experience.

### 7. IPMI fan control and sensor thresholds
On Super Micro X10-X11 motherboards IPMI uses six sensor thresholds to specify the safe and unsafe fan rotational speed intervals (these are RPM values rounded to nearest hundreds, defined for each fan separately):

```
Lower Non-Recoverable
Lower Critical
Lower Non-Critical
Upper Non-Critical
Upper Critical
Upper Non-Recoverable
```

but newer Super Micro X13 motherboards (with AST2600 BMC chip) have only one sensor threshold:

```
Lower Critical
```

Originally, this chapter was created Super Micro X10-X11 motherboards, but can be easily adopted to X13 motherboards as well (see more details in #33).

Like many other utilities (created by NAS and home server community), `smfc` also uses **IPMI FULL mode** for fan control, where all fans in the zone:

1. initially configured to full speed (100%)
2. then their speed can be safely configured in `[Lower Critical, Upper Critical]` interval
3. if any fan speed oversteps either `Lower Critical` or `Upper Critical` threshold then IPMI will generate an _assertion event_ and will set the all fan speeds back to 100% in the zone

Please also consider the fact that **fans are mechanical devices, their rotational speed is not stable** (it could be fluctuating). In order to avoid IPMI's assertion mechanism described here please follow the next steps:

1. Per fan: check the minimum and maximum rotational speeds of your fan on its vendor website
2. Per fan: configure proper IMPI sensor thresholds adjusted to the fan speed interval
3. Per zone: define safe `min_level`/`max_level` values for `smfc` respecting the variance of the all fans in the IPMI zone (it could take several iterations and adjustments)

Here is a real-life example for a [Noctua NF-F12 PWM](https://noctua.at/en/products/fan/nf-f12-pwm) fan:

```
Upper Non-Recoverable = 1800 rpm
Upper Critical = 1700 rpm
Upper Non-Critical = 1600 rpm
Lower Non-Critical = 200 rpm
Lower Critical = 100 rpm
Lower Non-Recoverable = 0 rpm
Max RPM = 1500 rpm
Min PRM = 300 rpm
max_level = 100 (i.e. 1500 rpm)
min_level = 35 (i.e. 500 rpm)
```

Notes:
- Use the following `ipmitool` command to display the current IMPI sensor thresholds for fans:
```
root@home:~# ipmitool sensor|grep FAN
FAN1 | 500.000 | RPM | ok | 0.000 | 100.000 | 200.000 | 1600.000 | 1700.000 | 1800.000
FAN2 | 500.000 | RPM | ok | 0.000 | 100.000 | 200.000 | 1600.000 | 1700.000 | 1800.000
FAN3 | na | | na | na | na | na | na | na | na
FAN4 | 400.000 | RPM | ok | 0.000 | 100.000 | 200.000 | 1600.000 | 1700.000 | 1800.000
FANA | 500.000 | RPM | ok | 0.000 | 100.000 | 200.000 | 1600.000 | 1700.000 | 1800.000
FANB | 500.000 | RPM | ok | 0.000 | 100.000 | 200.000 | 1600.000 | 1700.000 | 1800.000
```
- Use the following `ipmitool` command to list assertion events:
```
root@home:~# ipmitool sel list
1 | 10/19/2023 | 05:15:35 PM CEST | Fan #0x46 | Lower Critical going low | Asserted
2 | 10/19/2023 | 05:15:35 PM CEST | Fan #0x46 | Lower Non-recoverable going low | Asserted
3 | 10/19/2023 | 05:15:38 PM CEST | Fan #0x46 | Lower Non-recoverable going low | Deasserted
4 | 10/19/2023 | 05:15:38 PM CEST | Fan #0x46 | Lower Critical going low | Deasserted
5 | 10/19/2023 | 05:20:59 PM CEST | Fan #0x46 | Lower Critical going low | Asserted
```
- Use the following `ipmitool` commands to specify all six sensor thresholds for FAN1:
```
root@home:~# ipmitool sensor thresh FAN1 lower 0 100 200
root@home:~# ipmitool sensor thresh FAN1 upper 1600 1700 1800
```
- You can also edit and run `ipmi/set_ipmi_treshold.sh` to configure all IPMI sensor thresholds
- If you install a new BMC firmware on your Super Micro motherboard you have to configure IPMI thresholds again
- If you do not see fans when executing `ipmitool sensors`, you may want to reset the BMC to factory default using the Web UI or using `ipmitool mc reset cold`
- Noctua specifies the variance of minimum and maximum fan rotational speeds (e.g. see the [specification of Noctua NF-F12 PWM](https://noctua.at/en/products/fan/nf-f12-pwm/specification)). For example:

- `Rotational speed (+/- 10%) 1500 RPM`: 1350-1650 RPM interval
- `Min. rotational speed @ 20% PWM (+/-20%) 300 RPM`: 240-360 RPM interval

Please note that [LNA](https://noctua.at/en/na-src10)/ULNA cables or [Y-cables](https://noctua.at/en/na-syc1) can modify the rotational speed calculations here and the required IPMI sensor thresholds too.

You can read more about:

- IPMI fan control: [STH Forums](https://forums.servethehome.com/index.php?resources/supermicro-x9-x10-x11-fan-speed-control.20/) and [TrueNAS Forums](https://www.truenas.com/community/threads/pid-fan-controller-perl-script.50908/)
- Change IPMI sensors thresholds: [TrueNAS Forums](https://www.truenas.com/community/resources/how-to-change-ipmi-sensor-thresholds-using-ipmitool.35/)

### 8. Power management
If low noise and low heat generation are important attributes of your Linux box, then you may consider the following chapters.

#### 8.1 CPU
Most of the modern CPUs has multiple energy saving features. You can check your BIOS and enable them in order to minimize the heat generation.

Intel(R) CPUs:
- Intel(R) Speed Shift Technology
- Intel(R) SpeedStep
- C-states
- Boot performance mode

AMD(R) CPUs:
- PowerNow!
- Cool\`n\`quiet
- Turbo Core

With this setup the CPU will change its base frequency and power consumption dynamically based on the load.

#### 8.2 SATA hard disks
In case of SATA hard disks, you may enable:

- advanced power management
- spin down timer

With the help of command `hdparm` you can enable advanced power management and specify a spin down timer (read more [here](https://en.wikipedia.org/wiki/Hdparm)):

hdparm -B 127 /dev/sda
hdparm -S 240 /dev/sda

In file `/etc/hdparm.conf` you can specify all parameters in a persistent way:

quiet

/dev/sda {
apm = 127
spindown_time = 240
}
/dev/sdb {
apm = 127
spindown_time = 240
}
...

Important notes:
1. If you plan to spin down your hard disks or RAID array (i.e. put them to standby mode) you have to set up the configuration parameter `[HD zone] polling=` minimum twice bigger as the `spindown_time` specified here.
2. In file `/etc/hdparm.conf` you must define HD names in `/dev/disk/by-id/...` form to avoid inconsistency.

### 9. Kernel modules
We need to load the following important Linux kernel modules:

- [`coretemp`](https://www.kernel.org/doc/html/latest/hwmon/coretemp.html): temperature report for Intel(R) CPUs
- [`k10temp`](https://docs.kernel.org/hwmon/k10temp.html): temperature report for AMD(R) CPUs
- [`drivetemp`](https://www.kernel.org/doc/html/latest/hwmon/drivetemp.html): temperature report for SATA hard disks (available from kernel 5.6+ version)

Use `/etc/modules` file for persistent loading of these modules.
Here are some sample HWMON file locations for these kernel modules:

- `coretemp`: `/sys/devices/platform/coretemp.0/hwmon/hwmon*/temp1_input`
- `k10temp`: `/sys/bus/pci/drivers/k10temp/0000*/hwmon/hwmon*/temp1_input`
- `drivetemp`: `/sys/class/scsi_disk/0:0:0:0/device/hwmon/hwmon*/temp1_input`

Notes:
- `smfc` is able to find the proper HWMON file automatically for Intel(R) CPUs and SATA hard drives, but users of the AMD(R) CPU should specify manually (see `hwmon_path=` parameter in the config file)
- Reading `drivetemp` module is the fastest way to get the temperature of the hard disks, and it can read temperature of the SATA hard disks even in standby mode, too.

### 10. Installation
For the installation you need a root user. The default installation script `install.sh` will use the following folders:

| File | Installation folder | Description |
|----------------|-----------------------|---------------------------------|
| `smsc.service` | `/etc/systemd/system` | systemd service definition file |
| `smsc` | `/etc/default` | service command line options |
| `smsc.py` | `/opt/smfc` | service (python program) |
| `smsc.conf` | `/opt/smfc` | service configuration file |

but you can use freely any other folders too. The service has the following command line options:

root@home:~/opt/smfc# ./smfc.py --help
usage: smfc.py [-h] [-c CONFIG_FILE] [-v] [-l {0,1,2,3,4}] [-o {0,1,2}]

optional arguments:
-h, --help show this help message and exit
-c CONFIG_FILE configuration file
-v show program's version number and exit
-l {0,1,2,3,4} log level: 0-NONE, 1-ERROR(default), 2-CONFIG, 3-INFO, 4-DEBUG
-o {0,1,2} log output: 0-stdout, 1-stderr, 2-syslog(default)

You may configure logging output and logging level here and these options can be specified in `/etc/default/smfc`in a persistent way.

### 11. Configuration file
Edit `/opt/smfc/smfc.conf` and specify your configuration parameters here:

#
# smfc.conf
# smfc service configuration parameters
#

[Ipmi]
# Path for ipmitool (str, default=/usr/bin/ipmitool)
command=/usr/bin/ipmitool
# Delay time after changing IPMI fan mode (int, seconds, default=10)
fan_mode_delay=10
# Delay time after changing IPMI fan level (int, seconds, default=2)
fan_level_delay=2
# CPU and HD zones are swapped (bool, default=0).
swapped_zones=0

[CPU zone]
# Fan controller enabled (bool, default=0)
enabled=1
# Number of CPUs (int, default=1)
count=1
# Calculation method for CPU temperatures (int, [0-minimum, 1-average, 2-maximum], default=1)
temp_calc=1
# Discrete steps in mapping of temperatures to fan level (int, default=6)
steps=6
# Threshold in temperature change before the fan controller reacts (float, C, default=3.0)
sensitivity=3.0
# Polling time interval for reading temperature (int, sec, default=2)
polling=2
# Minimum CPU temperature (float, C, default=30.0)
min_temp=30.0
# Maximum CPU temperature (float, C, default=60.0)
max_temp=60.0
# Minimum CPU fan level (int, %, default=35)
min_level=35
# Maximum CPU fan level (int, %, default=100)
max_level=100
# Optional parameter, it will be generated automatically for Intel CPUs and must be specified manually for AMD CPUs.
# Path for CPU sys/hwmon file(s) (str multi-line list, default=/sys/devices/platform/coretemp.0/hwmon/hwmon*/temp1_input)
# hwmon_path=/sys/devices/platform/coretemp.0/hwmon/hwmon*/temp1_input
# /sys/devices/platform/coretemp.1/hwmon/hwmon*/temp1_input
# or
# hwmon_path=/sys/bus/pci/drivers/k10temp/0000*/hwmon/hwmon*/temp1_input

[HD zone]
# Fan controller enabled (bool, default=0)
enabled=1
# Number of HDs (int, default=1)
count=1
# Calculation of HD temperatures (int, [0-minimum, 1-average, 2-maximum], default=1)
temp_calc=1
# Discrete steps in mapping of temperatures to fan level (int, default=4)
steps=4
# Threshold in temperature change before the fan controller reacts (float, C, default=2.0)
sensitivity=2.0
# Polling interval for reading temperature (int, sec, default=10)
polling=10
# Minimum HD temperature (float, C, default=32.0)
min_temp=32.0
# Maximum HD temperature (float, C, default=46.0)
max_temp=46.0
# Minimum HD fan level (int, %, default=35)
min_level=35
# Maximum HD fan level (int, %, default=100)
max_level=100
# Names of the HDs (str multi-line list, default=)
# These names MUST BE specified in '/dev/disk/by-id/...' form!
hd_names=
# Optional parameter, it will be generated automatically based on the disk names.
# List of files in /sys/hwmon file system or 'hddtemp' (str multi-line list, default=)
# hwmon_path=/sys/class/scsi_disk/0:0:0:0/device/hwmon/hwmon*/temp1_input
# /sys/class/scsi_disk/1:0:0:0/device/hwmon/hwmon*/temp1_input
# hddtemp
# Standby guard feature for RAID arrays (bool, default=0)
standby_guard_enabled=0
# Number of HDs already in STANDBY state before the full RAID array will be forced to it (int, default=1)
standby_hd_limit=1
# Path for 'smartctl' command (str, default=/usr/sbin/smartctl).
# Required for 'standby guard' feature only
smartctl_path=/usr/sbin/smartctl
# Path for 'hddtemp' command (str, default=/usr/sbin/hddtemp).
# Required for reading of the temperature of SAS/SCSI disks.
hddtemp_path=/usr/sbin/hddtemp
Important notes:
1. `[HD zone} hd_names=`: This is a compulsory parameter, its value must be specified in `/dev/disk/by-id/...` form (the `/dev/sda` form is not persistent could be changed after a reboot).
2. `[CPU zone] / [HD zone] min_level= / max_level=`: Check the stability of your fans and adjust the fan levels based on your measurement. As it was stated earlier, IPMI can switch back to full rotational speed if fans reach specific thresholds. You can collect real data about the behavior of your fans if you edit and run script `ipmi/fan_measurement.sh`. The script will set fan levels from 100% to 20% in 5% steps and results will be saved in the file `fan_result.csv`:

root:~# cat fan_result.csv
Level,FAN1,FAN2,FAN4,FANA,FANB
100,1300,1300,1200,1300,1300
95,1300,1300,1100,1200,1300
90,1200,1200,1100,1200,1200
85,1100,1100,1000,1100,1100
80,1100,1100,1000,1100,1100
75,1000,1000,900,1000,1000
70,900,900,800,1000,900
65,900,900,800,900,900
60,800,800,700,900,800
55,700,700,700,800,700
50,700,700,600,700,700
45,600,600,500,700,600
40,500,500,500,600,500
35,500,500,400,500,500
30,400,400,300,400,400
25,300,300,300,400,300
20,1300,1300,1200,1300,1300

My experience is that Noctua fans in my box are running stable in the 35-100% fan level interval. An additional user experience is (see [issue #12](https://github.com/petersulyok/smfc/issues/12)) when Noctua fans are paired with Ultra Low Noise Adapter the minimum stable fan level could go up to 45% (i.e. 35% is not stable).

3. `[CPU zone] / [HD zone] hwmon_path=`: This parameter is optional for Intel(R) CPUs and SATA drives (i.e. `smfc` can identify automatically the proper file locations), but must be specified manually for AMD(R) CPUs. In case of SAS/SCSI hard disks (where `drivetemp` cannot be loaded) you can specify `hddtemp` value. You can use wild characters (`?,*`) in this parameter and `smfc` will do the path resolution automatically.
4. Several sample configuration files are provided for different scenarios in folder `./src/samples`. Please take a look on them, it could be a good starting point in the creation of your own configuration.

### 12. Automatic execution of the service
This `systemd` service can be started and stopped in the standard way. Do not forget to reload `systemd` configuration after a new installation or if you changed the service definition file:

systemctl daemon-reload
systemctl start smfc.service
systemctl stop smfc.service
systemctl restart smfc.service
systemctl status smfc.service
● smfc.service - Super Micro Fan Control
Loaded: loaded (/etc/systemd/system/smfc.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2021-09-17 23:28:10 CEST; 1 day 19h ago
Main PID: 1064180 (smfc.py)
Tasks: 1 (limit: 38371)
Memory: 7.4M
CPU: 41.917s
CGroup: /system.slice/smfc.service
└─1064180 /usr/bin/python3 /opt/smfc/smfc.py -c /opt/smfc/smfc.conf -l 2

Sep 19 17:12:39 home smfc.service[1064180]: CPU zone: new level > 39.0C > [T:40.0C/L:61%]
Sep 19 17:12:42 home smfc.service[1064180]: CPU zone: new level > 33.0C > [T:35.0C/L:48%]
Sep 19 17:48:14 home smfc.service[1064180]: CPU zone: new level > 38.0C > [T:40.0C/L:61%]

If you are testing your configuration, you can start `smfc.py` directly in a terminal. Logging to the standard output and debug log level are useful in this case:

cd /opt
sudo smfc.py -o 0 -l 3

### 13. Checking result and monitoring logs
All messages will be logged to the specific output and the specific level.
With the help of command `journalctl` you can check logs easily. For examples:

1. listing service logs of the last two hours:

journalctl -u smfc --since "2 hours ago"

2. listing service logs from the last boot:

journalctl -b -u smfc

## 14. FAQ

### Q: My fans are spinning up and loud. What's wrong?
Most probably the rotational speed of a fan went above or below of a IPMI threshold and IPMI switched back that zone to full rotational speed.
You can check the current fan rotational speeds:

ipmitool sdr

and you can also check IPMI event log and list assertion events:

If the problematic fan (causing the alert) is identified then you must adjust its threshold. This process could take several adjustment cycle. Be patent :)
You may read [this chapter](https://github.com/petersulyok/smfc#7-ipmi-fan-control-and-sensor-thresholds) for more details.

### Q: I would like to use constant fan rotational speed in one or both zones. How can I configure that?
You should configure the temperatures and levels with the same value.

min_temp=40
max_temp=40
min_level=60
max_level=60

With this setup there will be a constant 60% fan level in the specific zone. The temperature value is ignored, `steps` parameter is also ignored.

### Q: I receive an error message "Cannot read hwmon*/temp1_input file". What is the problem?
The problem is that the specific file cannot be found in HWMON system. The potential reasons behind this issue could be:
- `drivetemp` driver cannot support your disks (it support only SATA hard disks). In case of SAS/SCSI hard disks you can use `hddtemp` instead of `drivetemp`. See more details in [issue #21](https://github.com/petersulyok/smfc/issues/21).
- Maybe you specified the `hwmon_path=` parameter manually and it contains an invalid path. You can correct it.

### Q: How does the author test/use this service?
The configuration is the following:

- [Super Micro X11SCH-F motherboard](https://www.supermicro.com/en/products/motherboard/X11SCH-F)
- [Intel Core i3-9300T CPU](https://ark.intel.com/content/www/us/en/ark/products/134875/intel-core-i39300t-processor-8m-cache-up-to-3-80-ghz.html)
- 64 GB ECC DDR4 RAM
- [Fractal Design Node 804 case](https://www.fractal-design.com/products/cases/node/node-804/black/), with separate chambers for the motherboard and the hard disks:

- Debian Linux LTS (actually bookworm with backported Linux kernel 6.5)
- 8 x [WD Red 12TB (WD120EFAX)](https://shop.westerndigital.com/en-ie/products/outlet/internal-drives/wd-red-plus-sata-3-5-hdd#WD120EFAX) hard disks in ZFS RAID
- 3 x [Noctua NF-12 PWM](https://noctua.at/en/products/fan/nf-f12-pwm) fans (FAN1, FAN2, FAN4) in CPU zone
- 2 x [Noctua NF-12 PWM](https://noctua.at/en/products/fan/nf-f12-pwm) fans (FANA, FANB) in HD zone

## 15. References
Further readings:

### Super Micro
- [BMC IPMI User's Guide 1.1b (X10/X11/H11)](https://www.supermicro.com/manuals/other/IPMI_Users_Guide.pdf)
- [BMC resources](https://www.supermicro.com/en/solutions/management-software/bmc-resources)
- [IPMI Utilities](https://www.supermicro.com/en/solutions/management-software/ipmi-utilities)
- [IPMICFG download](https://www.supermicro.com/wdl/utility/IPMICFG/)
- [IPMICFG User's Guide 1.15 ](https://www.supermicro.com/wdl/utility/IPMICFG/IPMICFG_UserGuide.pdf)

### Forums/blogs
- [\[STH forums\] Reference Material: Supermicro X9/X10/X11 Fan Speed Control](https://forums.servethehome.com/index.php?resources/supermicro-x9-x10-x11-fan-speed-control.20/)
- [\[STH forums\] Addition to X9 motherboards](https://forums.servethehome.com/index.php?threads/supermicro-x9-x10-x11-fan-speed-control.10059/post-339801)
- [\[TrueNAS forums\] How To: Change IPMI Sensor Thresholds using ipmitool](https://www.truenas.com/community/resources/how-to-change-ipmi-sensor-thresholds-using-ipmitool.35/)
- [\[TrueNAS forums\] Script to control fan speed in response to hard drive temperatures](https://www.truenas.com/community/threads/script-to-control-fan-speed-in-response-to-hard-drive-temperatures.41294/)
- [\[Pcfe's blog\] Set fan thresholds on my Super Micro H11DSi-NT](https://blog.pcfe.net/hugo/posts/2018-08-14-epyc-ipmi-fans/)

### Linux kernel
- [coretemp] [documentation](https://www.kernel.org/doc/html/latest/hwmon/coretemp.html)
- [drivetemp] [documentation](https://www.kernel.org/doc/html/latest/hwmon/drivetemp.html) and its [GitHub respository](https://github.com/groeck/drivetemp)
- How to install [hddtemp](https://www.cyberciti.biz/tips/howto-monitor-hard-drive-temperature.html) from a source package

### Similar projects
- [\[GitHub\] Kevin Horton's nas_fan_control](https://github.com/khorton/nas_fan_control)
- [\[GitHub\] Rob Urban's fork nas_fan control](https://github.com/roburban/nas_fan_control)
- [\[GitHub\] sretalla's fork nas_fan control](https://github.com/sretalla/nas_fan_control)
- [\[GitHub\] Andrew Gunnerson's ipmi-fan-control](https://github.com/chenxiaolong/ipmi-fan-control)

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