Random Restarts?
Edward Ruggeri
ruggeri at uchicago.edu
Sun May 20 17:35:03 UTC 2007
On Sun, 20 May 2007 11:41:36 -0500, Roland Smith <rsmith at xs4all.nl> wrote:
> On Sun, May 20, 2007 at 11:03:25AM -0500, Edward Ruggeri wrote:
>> Hi,
>>
>> My system randomly reboots, usually in the evening. It is definitely
>> not a
>> soft reboot, since the filesystems don't get properly dismounted. My
>> suspicion is that it is a heat related issue -- I do leave the computer
>> running just about all day long, and it has started to get warm. Then
>> again, it's coolest in the evening...
>
> Try and install the mbmon port, and see if it works on your machine. If
> so, start a cron job that appends mbmon output to a file say every 15
> minutes. If it's a heat buildup issue in a monitored component, it would
> show.
>
> I wonder though. My machine usually doesn't need a day to heat up after
> a cold start. An hour or so usually suffices.
>
> Other causes could be a spike in the line voltage due to a large device
> switching on or off nearby. Or an underrated power supply overloaded
> through a cron job.
>
>
> Roland
Thanks for the ideas, Roland (and Tamouh)! I forgot about the possibility
of power issues. I do have an Antec power supply, 500W, which certainly
doesn't mean it isn't the problem, but it _ought_ to be able handle this
system...
But here's what I get if I run mbmon.
%mbmon -A -t -r 1
TEMP0 : 39.0
TEMP1 : 34.0
TEMP2 : 25.0
FAN0 : 0
FAN1 : 5818
FAN2 : 0
VC0 : +1.28
VC1 : +1.50
V33 : +3.30
V50P : +4.97
V12P : +11.13
V12N : -11.52
V50N : -3.76
Sun May 20 12:32:10 CDT 2007
That CPU temp is at about 97% idle -- high, no? The voltage on the 12V
lines seems pretty bad, and especially so on the -5V line. Should I trust
the sensors and think about a new PSU? In the meantime, I'll write to a
file, and see if it records a dip in power before the next reboot.
-- Ned Ruggeri
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