linux-kernel - Re: document ext3 requirements

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Message-ID: <20090105111913.47a8d1a5@lxorguk.ukuu.org.uk>
Date:	Mon, 5 Jan 2009 11:19:13 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Rob Landley <rob@...dley.net>
Cc:	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

> That would be true if the disk hardware wasn't doing a gazillion retries to 
> read a bad sector internally (taking 5 seconds to come back and report 
> failure), and then the darn scsi layer added another gazillion retries on top 
> of that, and the two multiply together to make it so slow that that when you 
> leave the thing copying the disk overnight it's STILL not done 24 hours later.  
> Going in and cherry picking individual files looks kind of appealing in that 
> situation.

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.

Alan
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