Date: Sun, 13 Jan 2008 17:41:25 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Pavel Machek <pavel@ucw.cz>
Cc: Theodore Tso <tytso@mit.edu>, Al Boldi <a1426z@gawab.com>,
       Valerie Henson <val.henson@gmail.com>, Rik van Riel <riel@redhat.com>,
       linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFD] Incremental fsck
Message-ID: <20080113174125.5f39ac64@lxorguk.ukuu.org.uk>
In-Reply-To: <20080113171916.GB4132@ucw.cz>
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	<20080112145140.GB6751@mit.edu>
	<20080113171916.GB4132@ucw.cz>
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> What are ext3 expectations of disk (is there doc somewhere)? For
> example... if disk does not lie, but powerfail during write damages
> the sector -- is ext3 still going to work properly?

Nope. However the few disks that did this rapidly got firmware updates
because there are other OS's that can't cope.

> If disk does not lie, but powerfail during write may cause random
> numbers to be returned on read -- can fsck handle that?

most of the time. and fsck knows about writing sectors to remove read
errors in metadata blocks.

> What abou disk that kills 5 sectors around sector being written during
> powerfail; can ext3 survive that?

generally. Note btw that for added fun there is nothing that guarantees
the blocks around a block on the media are sequentially numbered. The
usually are but you never know.

Alan
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