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Setting Up CPU and Board Temperature Sensing

This page is designed to help you obtain your CPU and motherboard temperatures, and hopefully keep them current and visible. If you aren't using Unraid v6 with the Dynamix System Temp plugin, then skip down to the 'older versions' section.

Setting up sensing for v6

This section is only for Unraid v6 with the Dynamix System Temp plugin installed. These instructions are lifted directly from the author's words here.

  1. Preparation

    Install the perl package, easiest done by installing the NerdPack plugin, then in the plugin enabling perl to install. Perl is only needed by the script "sensors-detect", which will be run in the background by the Detect function of Step 2. Once you have completed System Temp setup, perl is no longer needed and can be disabled, uninstalled.

  2. Detection

    Press the <Detect> button to search and automatically fill in the required drivers, or alternatively - if you know the name of the driver(s) - you can fill them in manually.

  3. Saving and activation

    Press the <Save> button to save and activate (load) the driver(s). This will create the file /config/plugins/dynamix.system.temp/drivers.conf on your flash device.

  4. Sensor assignment and display

    Use the dropdown menus under sensors to assign the appropriate sensor for CPU and motherboard readings. You may need to consult the user guide of your motherboard to find out which sensor needs to be selected here. Once a sensor selection is done, the corresponding item will be displayed at the right side of the footer. Click the <Apply> button to confirm your selection. This will create the file /config/plugins/dynamix.system.temp/sensors.conf on your flash device.

  5. You are done! You no longer need perl installed, and can remove it.

Last but not least: see also the online Help for System Temp!

Note: to unassign or remove a sensor just unselect it from the dropdown menu. This will also allow you to make new assignments (for example when the wrong sensor was chosen).

Setting up sensing for older versions

To pass system sensor data (such as temps, voltages, and fan speeds) to 3rd-party addons such as Dynamix (using its System Temp plugin) or SimpleFeatures, you need to load the required drivers and setup your sensor configuration file sensors.conf.

The following steps should work for most motherboards. (tested on a SuperMicro C2SEE/C2SEA)

Step 1: Open a console

You can either use the command console on the UnRAID server itself (if you have a keyboard and monitor attached), or you can login from another computer and use SSH or Telnet. On Windows, the PuTTY client for SSH and Telnet is preferred, because it allows you to use cut and paste, to save generated lines for your own sensors configuration file.

Step 2: Run sensors

At the command prompt, run sensors. Even without loading drivers, you will probably see a sensor or two, with temps and other info. The output should appear similar to:

root@Skynet:~# sensors
Adapter: ISA adapter
Core 0: +37.0 C (high = +78.0 C, crit = +100.0 C)
Core 1: +37.0 C (high = +78.0 C, crit = +100.0 C)
Adapter: ISA adapter
Vcore: +0.92 V (min = +0.92 V, max = +1.48 V)
in1: +1.86 V (min = +1.65 V, max = +1.99 V)
AVCC: +3.38 V (min = +2.96 V, max = +3.63 V)
+3.3V: +3.38 V (min = +2.61 V, max = +0.11 V) ALARM
in4: +1.57 V (min = +1.35 V, max = +1.65 V)
in5: +1.30 V (min = +1.13 V, max = +1.38 V)
in6: +1.46 V (min = +1.42 V, max = +1.52 V)
3VSB: +3.33 V (min = +2.96 V, max = +3.63 V)
Vbat: +3.26 V (min = +2.96 V, max = +3.63 V)
fan1: 0 RPM (min = 715 RPM, div = 16) ALARM
fan2: 2678 RPM (min = 712 RPM, div = 8)
fan3: 0 RPM (min = 715 RPM, div = 16) ALARM
fan4: 0 RPM (min = 44 RPM, div = 128) ALARM
fan5: 0 RPM (min = 715 RPM, div = 16) ALARM
temp1: +35.0 C (high = +60.0 C, hyst = +55.0 C) sensor = thermistor
temp2: +37.0 C (high = +80.0 C, hyst = +75.0 C) sensor = CPU diode
temp3: +0.0 C (high = +80.0 C, hyst = +75.0 C) sensor = CPU diode
cpu0_vid: +1.513 V
intrusion0: ALARM

Step 3: Note the devices

Make note of the sensor device(s). In the above example, they are w83627dhg-isa-0290 and coretemp-isa-0000. (Note: for coretemp you should run sensors -u coretemp-isa-0000 again to see the actual temperature labels. If they are called something like temp1_input, just use temp1 as a label for your sensors.conf - see below)

Step 4: Note the sensors

Make note of the specific sensors you wish to display. In the above example, temp1 is the motherboard and temp2 is the CPU.

Step 5: Create sensors.conf

Create your sensors.conf file. This will contain the sensor device(s) and labels (optional) for the temperatures you wish to monitor. For Dynamix and Simple Features, it must establish the 2 labels 'MB Temp' and 'CPU Temp'.

  • To be used by Dynamix, save this file to your flash drive, in the path /boot/config/plugins/dynamix. In Windows, this path would be something like \\tower\flash\config\plugins\dynamix.
  • If not for Dynamix, save this file into a persistent location on the flash drive, e.g. /boot/config or /boot/custom. Later, you will probably need a copy command in your 'go' file, to copy it to its correct location in the UnRAID system.

In the sample sensors.conf file below, I'm only using data from the 2nd sensor device.

# lines starting with "#" are comments and ignored
# sensor configuration

chip "w83627dhg-isa-0290"

label temp1 "MB Temp"
label temp2 "CPU Temp"

Step 6: Prepare sensors-detect

The sensors-detect tool is a long script that should detect all of your sensors, and help you get the right sensor driver names. A copy is included with UnRAID, but it's not the latest, and if you have a new motherboard (recent manufacture), you will want to use the latest version, as it is occasionally updated with the newest drivers and sensors. Go to the lm-sensors Devices page, and look for the link "latest version of sensors-detect", in the 3rd paragraph currently. The lm-sensors site is down currently! Download and copy it to your flash drive. To run it (assuming it's in the root folder of the flash), you will need to either change to the flash drive (cd /boot), or run the command as /boot/sensors-detect.

The sensors-detect tool requires Perl to be installed, at least temporarily.

  • If it isn't already installed, you will need to download an appropriate version for your UnRAID release:

    • For UnRAID v4 series, get it from here
    • For UnRAID v5 series, get it from here May need updated/corrected perl links.
    • For UnRAID v6 series, get it from here
  • Copy it to the packages folder on your flash drive, creating that folder if it does not already exist (md /boot/packages).

  • Then use installpkg and the perl package name to install it (eg. installpkg /boot/packages/perl-5.18.1-x86_64-1.txz).

  • Or for Dynamix, you can modify the Dynamix System Temp plugin itself (currently for v5 it's /boot/config/plugins/dynamix.system.temp-2.1.0-noarch-bergware.plg), by locating the line ending with "# perl scripting" and replacing "no-install" with "do-install". Then re-install the plugin or reboot. Change it back to "no-install" when you are done with this whole procedure.

Step 7: Run sensors-detect

Run sensors-detect. Enter [YES] for the various scans. Enter [NO] to automatically generate the config file (last prompt). The output should be similar to:

root@Skynet:~# sensors-detect
# sensors-detect revision 6031 (2012-03-07 17:14:01 +0100)
# System: Supermicro C2SEA [1234567890]

This program will help you determine which kernel modules you need
to load to use lm_sensors most effectively. It is generally safe
and recommended to accept the default answers to all questions,
unless you know what you're doing.

Some south bridges, CPUs or memory controllers contain embedded sensors.
Do you want to scan for them? This is totally safe. (YES/no): YES
Silicon Integrated Systems SIS5595... No
VIA VT82C686 Integrated Sensors... No
VIA VT8231 Integrated Sensors... No
AMD K8 thermal sensors... No
AMD Family 10h thermal sensors... No
AMD Family 11h thermal sensors... No
AMD Family 12h and 14h thermal sensors... No
AMD Family 15h thermal sensors... No
AMD Family 15h power sensors... No
Intel digital thermal sensor... Success!
(driver `coretemp')
Intel AMB FB-DIMM thermal sensor... No
VIA C7 thermal sensor... No
VIA Nano thermal sensor... No

Some Super I/O chips contain embedded sensors. We have to write to
standard I/O ports to probe them. This is usually safe.

Do you want to scan for Super I/O sensors? (YES/no): YES
Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor/ITE'... No
Trying family `SMSC'... No
Trying family `VIA/Winbond/Nuvoton/Fintek'... Yes
Found `Winbond W83627DHG-P/W83527HG Super IO Sensors' Success!
(address 0x290, driver `w83627ehf')
Probing for Super-I/O at 0x4e/0x4f
Trying family `National Semiconductor/ITE'... No
Trying family `SMSC'... No
Trying family `VIA/Winbond/Nuvoton/Fintek'... No
Trying family `ITE'... No

Some systems (mainly servers) implement IPMI, a set of common interfaces
through which system health data may be retrieved, amongst other things.
We first try to get the information from SMBIOS. If we don't find it
there, we have to read from arbitrary I/O ports to probe for such
interfaces. This is normally safe. Do you want to scan for IPMI
interfaces? (YES/no): YES
Probing for `IPMI BMC KCS' at 0xca0... No
Probing for `IPMI BMC SMIC' at 0xca8... No

Some hardware monitoring chips are accessible through the ISA I/O ports.
We have to write to arbitrary I/O ports to probe them. This is usually
safe though. Yes, you do have ISA I/O ports even if you do not have any
ISA slots! Do you want to scan the ISA I/O ports? (yes/NO): YES
Probing for `National Semiconductor LM78' at 0x290... No
Probing for `National Semiconductor LM79' at 0x290... No
Probing for `Winbond W83781D' at 0x290... No
Probing for `Winbond W83782D' at 0x290... No

Lastly, we can probe the I2C/SMBus adapters for connected hardware
monitoring devices. This is the most risky part, and while it works
reasonably well on most systems, it has been reported to cause trouble
on some systems.
Do you want to probe the I2C/SMBus adapters now? (YES/no): YES
Using driver `i2c-i801' for device 0000:00:1f.3: Intel ICH10
Module i2c-dev loaded successfully.

Next adapter: SMBus I801 adapter at 0400 (i2c-0)
Do you want to scan it? (YES/no/selectively): YES
Client found at address 0x50
Probing for `Analog Devices ADM1033'... No
Probing for `Analog Devices ADM1034'... No
Probing for `SPD EEPROM'... Yes
(confidence 8, not a hardware monitoring chip)
Probing for `EDID EEPROM'... No
Client found at address 0x52
Probing for `Analog Devices ADM1033'... No
Probing for `Analog Devices ADM1034'... No
Probing for `SPD EEPROM'... Yes
(confidence 8, not a hardware monitoring chip)

Now follows a summary of the probes I have just done.
Just press ENTER to continue:

Driver `w83627ehf':
* ISA bus, address 0x290
Chip `Winbond W83627DHG-P/W83527HG Super IO Sensors' (confidence: 9)

Driver `coretemp':
* Chip `Intel digital thermal sensor' (confidence: 9)
Do you want to generate /etc/sysconfig/lm_sensors? (yes/NO): NO
To load everything that is needed, add this to one of the system
initialization scripts (e.g. /etc/rc.d/rc.local):

#----cut here----
# Chip drivers
modprobe coretemp
modprobe w83627ehf
/usr/bin/sensors -s
#----cut here----

If you have some drivers built into your kernel, the list above will
contain too many modules. Skip the appropriate ones! You really
should try these commands right now to make sure everything is
working properly. Monitoring programs won't work until the needed
modules are loaded.

Unloading i2c-dev... OK

Step 8: Note the drivers

Make note of the driver name(s) listed in the summary. In the above example, they are w83627ehf and coretemp.

Step 9: Add modprobes to go

Edit your 'go' file and add in the modprobe command for each sensor driver that is required.

# modprobe for each sensor`
modprobe w83627ehf
modprobe <sensor2>
modprobe <sensor3>

Step 10: Add the copy instruction to go

If you are configuring for Dynamix, this step is not needed, so skip to Step 11. Otherwise, add another line in your 'go' file to copy your persistent sensors.conf file (from where you created/saved it in Step 5) into the appropriate location on each boot.

# copy the sensor.conf file for use
cp /boot/config/sensors.conf /etc/sensors.d

Step 11: Reboot and check

Reboot to load up the changes, and check whether the temps are correct. If wrong, you may have to select different sensors or customize the sensors.conf file.