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Subject: Re: backups/dumps/caches
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Oliver Xymoron <oxymoron@waste.org>
Cc: Richard Bonomo <bonomo@sal.wisc.edu>, linux-kernel@vger.kernel.org,
       Richard Bonomo <bonomo@maddog.sal.wisc.edu>
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Date: 06 Aug 2002 23:34:15 +0100
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On Tue, 2002-08-06 at 21:54, Oliver Xymoron wrote:
> > 2. Perhaps, naively, is it possible to shut off
> >   caching temporarily (and without rebooting),
> >   accepting the performance hit, while a dump
> >   is done, and then restart caching afterwards?
> 
> Yep. Switch to single user mode, sync all filesystems, unmount them for
> good measure, dump, then switch back to multiuser mode.

If you are using 2.4.19 then the actual bug dump hits is sorted. Dumping
a live fs still will mean you end up restoring a not 100% consistent
state of one file versus another and of file data for a given file. You
have to weigh that against downtime. In most cases the downtime isnt
worth it for having a few files that are logged in a transient state.


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