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RE: XFS corruption during power-blackout

To: "'Sonny Rao'" <sonny@xxxxxxxxxxx>
Subject: RE: XFS corruption during power-blackout
From: "Al Boldi" <a1426z@xxxxxxxxx>
Date: Wed, 6 Jul 2005 07:24:03 +0300
Cc: "'Jens Axboe'" <axboe@xxxxxxx>, "'David Masover'" <ninja@xxxxxxxxxxxx>, "'Chris Wedgwood'" <cw@xxxxxxxx>, "'Nathan Scott'" <nathans@xxxxxxx>, <linux-xfs@xxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <linux-fsdevel@xxxxxxxxxxxxxxx>, <reiserfs-list@xxxxxxxxxxx>
In-reply-to: <20050705181057.GA16422@kevlar.burdell.org>
Sender: linux-xfs-bounce@xxxxxxxxxxx
Thread-index: AcWBjLAcL2Ef45tFSJOcSXMRBNyXrwAVUTmQ
Sonny Rao wrote: {
> > > >On Wed, Jun 29, 2005 at 07:53:09AM +0300, Al Boldi wrote:
> > > >>What I found were 4 things in the dest dir:
> > > >>1. Missing Dirs,Files. That's OK.
> > > >>2. Files of size 0. That's acceptable.
> > > >>3. Corrupted Files. That's unacceptable.
> > > >>4. Corrupted Files with original fingerprint. That's ABSOLUTELY 
> > > >>unacceptable.
> > > >
> > 2. Moral of the story is: What's ext3 doing the others aren't?
> 
> Ext3 has stronger guaranties than basic filesystem consistency.
> I.e. in ordered mode, file data is always written before metadata, so 
> the worst that could happen is a growing file's new data is written 
> but the metadata isn't updated before a power failure... so the new 
> writes wouldn't be seen afterwards.
> 
I believe in newer 2.6 kernels that Reiser has ordered mode (IIRC, courtesy
of Chris Mason), but XFS and JFS do not support it.
}

Was ordered mode disabled/removed when XFS was add to the vanilla-kernel?



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