linux-kernel - Re: [RFD] Incremental fsck

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Message-ID: <20080113174125.5f39ac64@lxorguk.ukuu.org.uk>
Date:	Sun, 13 Jan 2008 17:41:25 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Pavel Machek <pavel@....cz>
Cc:	Theodore Tso <tytso@....edu>, Al Boldi <a1426z@...ab.com>,
	Valerie Henson <val.henson@...il.com>,
	Rik van Riel <riel@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFD] Incremental fsck

> 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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