[mythtv-users] Backend powered off/shutdown unexpectedly!

[Mike Hodson]

I should also mention if there are overheat events, sometimes those show up
as kernel machine check exceptions or as thermal throttle messages.

They should be logged as well, and I also forgot to mention these logs can
be read in realtime with the 'dmesg' command.
On Jan 30, 2014 1:20 AM, "Mike Hodson" <mystica at gmail.com> wrote:

> Hello Ian,
>
> There's actually a few things that could cause a power off..
>
> First worth mentioning, as you say you recently started having issues
> after adding more hardware and this more power drain on certain parts of
> the power supply, that there may be sizing issues or perhaps a power supply
> going bad depending on its age and usage margin between rated output and
> actual usage ... Or you may be one of the unlucky ones with capacitors that
> pop open and cause the pay to die an early death.
>
> Other parts would be an ACPI power off from the power button if something
> bumped it... This should be logged if kernel logs are enabled. I don't know
> which release of Ubuntu you are on but newer ones may log different than
> older ones. The version would be helpful, but often these are in /var/log
> and usually called messages or a kernel log file name. I'm not an Ubuntu
> person myself so perhaps someone more versed could chime in on this
> aspect... I use syslog-ng on funtoo myself...
>
> Finally there is always overheating potential, which cab be logged via a
> sensors program, usually included or easily installed. I know of
> LM_sensors, which can be run with 'sensors' from a command line or ssh once
> the appropriate settings are found. There is an auto configure script if I
> remember correctly, its been a while.
>
> Hope this helps!
>
> Mike
> On Jan 29, 2014 7:10 PM, "Ian Evans" <dheianevans at gmail.com> wrote:
>
>> Combo MythTV/Ubuntu/hardware question here.
>>
>> Just got in to discover that our backend was off for the last three
>> hours. 2nd time that has happened since Xmas when we added a new drive.
>> Forgot to write then because I was working on a deadline. However, the
>> system has been rock solid otherwise, lots or recordings, no video
>> glitches, etc.
>>
>> Won't be able to reboot and check BIOS until after midnight (recordings)
>> but can SSH in and check logs. So some questions:
>>
>> 1) BIOS is/was set to boot on power. Since this has only happened in two+
>> yrs twice since we added a drive at Xmas, is there a way that setting could
>> have been bumped or switched off on its own? Didn't make any changes to
>> BIOS when I added the drive but just covering my bases.
>>
>> 2) If it's something like "shutting down for safety" (detected
>> overheating/etc) is there any log, Myth or Ubuntu, that would show some
>> message that translates to "Emergency! Powering down!" so I can see what
>> happened?
>>
>> 3) I don't have Wake-on-LAN set, but is it just wake, or can it power on
>> the system as well? I run a website so perhaps I could have that server
>> ping our dyndns every five minutes or so and send a wake up call if the
>> system is down,
>>
>> Thanks for any help. WAF is at risk! :-)
>>
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>>
>>
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