On 9/30/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Group, I recently built a ventilated stucture around my 4 desktops to
try to quiet things down and get rid of the heat.
I made no provision for forced shutdown in case of overheat, which is
quite likely to happen if, for example the main ventilation fan went
down for some reason.
Well, that happened due to stupidity on my part with getting used to
the new setup. I fired up a computer and neglected to turn the fan
on. Then left it running overnight.
Well, given the confined space and very little/no ventilation (of my
homemade structure) the computer got hot...
Sometime this morning I see syslog messages written to tty that say:
Message from [EMAIL PROTECTED] at Sat Sep 30 04:41:32 2006 ...
reader kernel: CPU0: Temperature above threshold
Message from [EMAIL PROTECTED] at Sat Sep 30 04:41:32 2006 ...
reader kernel: CPU0: Running in modulated clock mode
[...]
Some kind of attempt by kernel to cool things down. But will it
actually shutdown if it gets dangerously hot?
Further, how can I discover what temperatures were involved when this
happened?
Or can I set something to make a shutdown happen at a specific
temperature?
A nicer solution would be somekind of added stand alone temperature
monitor in the enclosure that causes a controlled shutdown like one
gets with `shutdown -h now'.
Anyone here with some experience in this kind of thing that can steer me
to some good information?
If you have built your kernel with ACPI options for THERMAL or some
kind of frequency changer, you can use a daemon like cpufreqd to
monitor the temperature and take actions like reduce the clock and
voltage to avoid damage to the processor.
http://www.gentoo.org/doc/en/power-management-guide.xml
When my computer reaches the limit (wich in my case is 73 degrees C)
it automatically shutdown, I didn't have to configure anything, it is
builtin with the thermal ACPI module. I'm talking about a Pentium IV
Northwood here, and they tend to get really hot. It used to happen to
my Athlon XP also... To monitor the temperature, you can read the
/proc entries created by ACPI, for example
/proc/acpi/thermal/TZ0/info.
--
Daniel da Veiga
Computer Operator - RS - Brazil
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