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Date:      Fri, 10 May 2002 12:31:37 -0500
From:      Mike Meyer <mwm-dated-1021483897.a81af7@mired.org>
To:        Rahul Siddharthan <rsidd@online.fr>
Cc:        chat@freebsd.org
Subject:   Re: My horror story
Message-ID:  <15580.1017.276905.556906@guru.mired.org>
In-Reply-To: <20020510140222.M57329@lpt.ens.fr>
References:  <000701c1f804$47d5dc00$6401a8c0@penguin> <20020510140222.M57329@lpt.ens.fr>

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In <20020510140222.M57329@lpt.ens.fr>, Rahul Siddharthan <rsidd@online.fr> typed:
> I think the conventional wisdom is that if you use sync mounts
> (default) + softupdates, and turn off IDE write-caching, your
> filesystem should always be in a consistent state.  I'm no expert, I'm
> quoting from the tuning(7) manpage and elsewhere...

Three points of confusion here. One, the default mount is noasync, not
sync. Two, softupdates is not orthogonal to the sync/noasync/async
mount flag. It turns those off when you do the mount, so you really
have four choices in that list:
sync/softupdates/noasync/async. Finally, softupdates + write caching
off will generally keep your directory tree in a consistent state, but
that doesn't mean you can't lose data.

	<mike
--
Mike Meyer <mwm@mired.org>			http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.

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