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Date: Mon, 3 Jul 2006 22:22:19 +0200
To: Thomas Glanzmann <sithglan@stud.uni-erlangen.de>,
       "Theodore Ts'o" <tytso@mit.edu>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: ext4 features
Message-ID: <20060703202219.GA9707@aitel.hist.no>
References: <20060701163301.GB24570@cip.informatik.uni-erlangen.de> <20060701170729.GB8763@irc.pl> <20060701174716.GC24570@cip.informatik.uni-erlangen.de> <20060701181702.GC8763@irc.pl>
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From: Helge Hafting <helgehaf@aitel.hist.no>
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On Sat, Jul 01, 2006 at 08:17:02PM +0200, Tomasz Torcz wrote:
> On Sat, Jul 01, 2006 at 07:47:16PM +0200, Thomas Glanzmann wrote:
> > Hello,
> > 
> > > Checksums are not very useful for themselves. They are useful when we
> > > have other copy of data (think raid mirroring) so data can be
> > > reconstructed from working copy.
> > 
> > it would be possible to identify data corruption.
> > 
> 
>   Yes, but what good is identification? We could only return I/O error.
> Ability to fix corruption (like ZFS) is the real killer.

Isn't that what we have RAID-1/5/6 for?  

Helge Hafting