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From: Matthew Gardiner <kiwiunixman@yahoo.co.nz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>, bvermeul@devel.blackstar.nl
Subject: Re: ReiserFS / 2.4.6 / Data Corruption
Date: Sun, 29 Jul 2001 02:16:13 +1200
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Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), reiser@namesys.com (Hans Reiser),
        J.A.K.Mouw@ITS.TUDelft.NL (Erik Mouw), haiquy@yahoo.com (Steve Kieu),
        samuelt@cervantes.dabney.caltech.edu (Sam Thompson),
        linux-kernel@vger.kernel.org (kernel)
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On Saturday 28 July 2001 01:39, Alan Cox wrote:
> > > Putting a sync just before the insmod when developing new drivers is a
> > > good idea btw
> >
> > I've been doing that most of the time. But I sometimes forget that.
> > But as I said, it's not something I expected from a journalled
> > filesystem.
>
> You misunderstand journalling then
>
> A journalling file system can offer different levels of guarantee. With
> metadata only journalling you don't take any real performance hit but your
> file system is always consistent on reboot (consistent as in fsck would
> pass it) but it makes no guarantee that data blocks got written.
>
> Full data journalling will give you what you expect but at a performance
> hit for many applications.
>
> Alan

Just in regards to full journalling, will/is there an option in ReiserFS to 
allow it? Personally, I would much rather have full journalling, and a little 
more of a performance hit for security and reliability, than great 
performance and a higher level of risk.

Matthew Gardiner
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