Re: [gentoo-user] Emergency shutdown, how to?

[Mark Knecht]

On Wed, Apr 2, 2008 at 12:19 PM, Dale <dalek1967@×××××××××.net> wrote:
>
> Volker Armin Hemmann wrote:
>
> > On Mittwoch, 2. April 2008, Steven Lembark wrote:
> >
> >
> > > Liviu Andronic wrote:
> > >  > On Fri, Mar 28, 2008 at 10:07 AM, Dale <dalek1967@×××××××××.net>
> wrote:
> > >  >>> By the way the safest and recommended command, although a bit
> longish
> > >  >>> should be ALT+SysRq(or print)+S(ync)+U(mount)+B(Reboot).
> > >  >>
> > >  >>  Since I wanted to shutdown instead of reboot, it would be ALT +
> SysRq
> > >  >> + S + U + O then correct?
> > >  >
> > >  > Are there any potential harms to the hardware / system in case one
> > >  > tends to abuse (i.e. use more often than necessary) of this command?
> > >  > It's so often so tempting to shut down your system fast.
> > >
> > > Short of a serious emergency (e.g., UPS with
> > > 30-sec lag and no input power) stick with
> > > 'shutdown -fh now'. The main problem is that
> > > you bypass the stop phase of all the app's
> > > started up via init.d; very little short of
> > > just hitting the reset switch or yanking the
> > > power.
> > >
> > >
> >
> > if you do it the right way, start with 'e' and 'i', all apps are cleanly
> terminated/killed. So if an app does not quit cleanly, it is broken.
> >
> > The correct sequence is: e,i,u,b/o and it is absolutly save.
> >
> >
>
>
>  Folks, keep in mind why I asked this question in the first place.  My power
> supply was frying and I needed a VERY fast shutdown.  This was not asked as
> a fast way to shutdown just because we are impatient or something.  This was
> for the event of a serious emergency where I needed a shutdown in just a
> very few seconds not a minute or two.  Some of my services take a while to
> stop, foldingathome being the longest one.
>
>  Basically, this is not intended to be used to shutdown a puter on a regular
> basis, unless you burn out P/S's on a daily basis.  O-o
>
>  Just didn't want someone to be using this on a regular basis and then
> wondering why their system has a new nickname, FUBAR.  :'(
>
>  Dale
>
>  :-)  :-)
>

Understood. I think it sort of morphed into something more general,
like what to do when the rest of us run into the occasional problem we
all run into. Yesterday our MythTV backend server crashed 4 times. It
hung completely killing X, etc. and I was in need of a good way to
bring the machine down. I found this topic both timely and helpful, at
least for future problems.

Cheers,
Mark
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