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

[Mike Hodson]

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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