[LBo] chapter 2 , how to shut down

[jsl06 at myrealbox.com]

Steve,
      I want to tell you of an experience I had.  I use a laptop.  I was 
using an PCMCIA auxillary drive.  This drive was plugged into a 110 
outlet.  There was a power failure.  My laptop continued working because 
it was powered by battery.  The auxillary drive stopped.  I did not notice 
the power failure, and took no action.  What did I lose?  The ability to 
mount the drive.

                            James Laney
                        <jsl06 at ispwest.com>
                        <jsl06 at myrealbox.com>

On Sun, 29 Oct 2006, Stefan Waidele wrote:

> Steve Kist schrieb:
>> Rafi Gabzu wrote:
>> 
>>> 1.Assuming I'm in the text mode , how do I shut down / halt the system
>>> before powering it off ?
>> $> shutdown -h now - see man shutdown
>
> Many systems also have a "poweroff" command, which does basically the same.
>
>>> 2.How can I protect my self from a sudden electrical power off ?
>> UPS
>
> Or use a laptop :)
>
> In case an UPS (Uninteruptible Power Supply) is too expensive, you might take 
> a look at journaling filesystems (ext3, reiser, xfs?).
>
> If poweoff occurs during a write to disk, a clean state can be reached when 
> the system goes up the next time. The filesystem will not be corrupted by 
> interrupted write-operation.
>
> An UPS can save you from loosing the data you are working on when power dies. 
> But be aware that an UPS needs care.
> I removed my UPS from my _server_ in the hotel because I had three failures 
> due to old batteries in the UPS, but NO power-outage since years!
>
> But I am speaking against UPSs
>
>>> 3. What kind of damage might happen ?
>> Depends on what the box is doing at the moment, often none,
>> except for a longer boot process as the file system is reviewed.
>
> And you will lose the stuf you worked on since the last save.
>
> Stefan
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