Even if a hardware failure due to unexpected power down is rare, he should
be protected against it. Recently I've seen problems with Virtualbox, on
power failure the disc file can be corrupted and you loose the VM, it
happened to me once with Virtualbox 3.1.

Antonio, you can use one no-break with USB or Serial port, when it
activates the batteries it can send a signal to your server shutdown
properly, if that is not an option be ready to use your backup plan.



Atenciosamente,
__
*Paulo Sampaio**
*
*http://devio.us/~psampaio/*



2012/5/7 Colin Law <clanlaw@goog...>

> On 7 May 2012 10:52, James Plate <james.plate@gmai...> wrote:
> > On 05/07/2012 05:07 AM, Colin Law wrote:
> >> 2012/5/7 James Plate <james.plate@gmai...>:
> >>> On 05/07/2012 03:31 AM, Antonio Fernández Pérez wrote:
> >>>> Hi everybody,
> >>>>
> >>>> I have configured a machine to print Wi-Fi tickets with Ubuntu Server
> >>>> and OpenBox desktop manager that launch a Java graphical application
> >>>> on boot. If the machine will be shutdown by power button, what effects
> >>>> could to have? Could it affect to some partition? Could corrupt the
> >>>> system and not start? There are some tool to repair the boot and make
> >>>> that the system boots normally?
> >>>>  [pointless Spanish (I think) legal rubbish deleted - even more
> pointless than normal since this is an English speaking list]
> >>> Yes it most certainly can cause hardware issues, including but not
> >>> limited to corrupted sectors on your hard disk.
> >> Though in practice it is very rare that it actually causes any
> >> problems with modern file systems.  As far as I can remember I have
> >> never lost anything on Linux when this happens except for data in
> >> files on which I was currently working, or once when the system was
> >> trashed by a power failure in the middle of a kernel upgrade.  But
> >> that was caused by the fact that I had a half installed kernel, which
> >> was not good.
> >>
> >> @James, what problems can it cause apart from corrupting data being
> >> written at the time of failure?
> >>
> >> Colin
> >>
> > I'm sure it's a rare occurence with new hardware but historically it
> > could physically damage the disk platter, espescially if the disk is
> > being accessed when a shutdown was forced/power lost. I could be out of
> > date with my info. I've just made it a habit for a long time to not make
> > a habit of hard resets/shutdowns.
>
> Certainly one should not make a habit of it, but I don't think modern
> disks will be physically damaged by an unexpected power down.
>
> Colin
>
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