linux-kernel - Re: document ext3 requirements

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Message-Id: <200901061331.18690.rob@landley.net>
Date:	Tue, 6 Jan 2009 13:31:16 -0600
From:	Rob Landley <rob@...dley.net>
To:	Theodore Tso <tytso@....edu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@...e.cz>,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Duane Griffin <duaneg@...da.com>, Valdis.Kletnieks@...edu,
	Martin MOKREJŠ <mmokrejs@...osome.natur.cuni.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org
Subject: Re: document ext3 requirements

On Tuesday 06 January 2009 09:57:29 Theodore Tso wrote:
> On Tue, Jan 06, 2009 at 04:40:33PM +0100, Andi Kleen wrote:
> > > Well, Kurt Garloff wrote that program years and years ago.  I'm sure
> > > if someone created patches he'd probably accept them, though.  It's
> > > still the best program I've found for doing image backups in
> > > catastrophic situations.
> >
> > Better would be just to incorporate the functionality as an option
> > into standard GNU dd. Then everyone would easily have access to it.
>
> I'm not sure whether the GNU coreutils maintainer would be willing to
> accept a series of Linux-specific interfaces, but dd_rescue also has
> the advantage that it uses a large blocksize for speed, but when an
> error is returned, it backs off to a small block size to recovery the
> maximum amount of data, and then later returns to the large block
> size.  (Ideally, it should be able to query the disk drive to
> determine its internal block size, and use that for the smaller block
> size, but I'm not sure if there's a standardized way that value is
> exposed by HDD's or SDD's.)

I don't suppose there a Documentation file to put data recovery information 
in?

(Maybe the new filesystems expectations file, which doesn't seem the best name 
for it...?)

Rob
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