linux-kernel - Re: document ext3 requirements

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Message-ID: <20090106104146.GD6700@merlin.emma.line.org>
Date:	Tue, 6 Jan 2009 11:41:46 +0100
From:	Matthias Andree <matthias.andree@....de>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	Rob Landley <rob@...dley.net>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>, 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 Mon, 05 Jan 2009, Martin K. Petersen wrote:

> >>>>> "Rob" == Rob Landley <rob@...dley.net> writes:
> 
> Rob> On Monday 05 January 2009 05:19:13 Alan Cox wrote:
> >> You could of course just learn to use the functions the kernel
> >> provides.  If you want to recover disk blocks without retrying you
> >> can do that via SG_IO. If you want to adjust the timeout and retry
> >> levels you can do that too via sysfs.
> 
> Rob> Good to know, but "my laptop hard drive just died" is not the
> Rob> optimal time to learn these sorts of things.
> 
> http://www.garloff.de/kurt/linux/ddrescue/

While nice, it does not reconfigure the block layer to reduce retries;
at least not in a manner I see at a glance; no sysctl or SG_IO or ioctl
or fcntl anywhere.

-- 
Matthias Andree
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