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Introduction
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Most mainboards have sensor chips to monitor system health (like temperatures,
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voltages, fans speed). They are often connected through an I2C bus, but some
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are also connected directly through the ISA bus.
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The kernel drivers make the data from the sensor chips available in the /sys
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virtual filesystem. Userspace tools are then used to display the measured
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values or configure the chips in a more friendly manner.
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Lm-sensors
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----------
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Core set of utilities that will allow you to obtain health information,
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setup monitoring limits etc. You can get them on their homepage
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http://www.lm-sensors.nu/ or as a package from your Linux distribution.
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If from website:
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Get lm-sensors from project web site. Please note, you need only userspace
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part, so compile with "make user" and install with "make user_install".
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General hints to get things working:
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0) get lm-sensors userspace utils
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1) compile all drivers in I2C and Hardware Monitoring sections as modules
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in your kernel
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2) run sensors-detect script, it will tell you what modules you need to load.
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3) load them and run "sensors" command, you should see some results.
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4) fix sensors.conf, labels, limits, fan divisors
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5) if any more problems consult FAQ, or documentation
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Other utilities
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---------------
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If you want some graphical indicators of system health look for applications
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like: gkrellm, ksensors, xsensors, wmtemp, wmsensors, wmgtemp, ksysguardd,
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hardware-monitor
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If you are server administrator you can try snmpd or mrtgutils.
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