linux-kernel - Re: SATA hdd refuses to reallocate a sector?

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Date:	Mon, 24 Jun 2013 08:18:15 -0400
From:	Mark Lord <mlord@...ox.com>
To:	Ondrej Zary <linux@...nbow-software.org>
CC:	Pavel Machek <pavel@....cz>,
	Marcus Overhagen <marcus.overhagen@...il.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, tj@...nel.org
Subject: Re: SATA hdd refuses to reallocate a sector?

On 13-06-24 03:14 AM, Ondrej Zary wrote:
..
> Being tired of using hdparm manually, I created a simple hdd_realloc utility
> that reads the disk in big blocks (1 MB). When there's a read error, it reads
> the failed block sector-by-sector and tries to rewrite the sectors that fail
> to read. It work fine for disks with just a couple of pending sectors.

Something like that would work very well if it used the hdparm approach
(directly to the drive) for the sector-by-sector part.

Going through the block layer isn't always going to work,
because the kernel likes to do I/O in PAGE_SIZE multiples.

And the SCSI stack in Linux has rather atrocious error handling.
It lumps multiple requests together, and can fail the entire lot even
if only a single sector is bad.

Cheers
-- 
Mark Lord
Real-Time Remedies Inc.
mlord@...ox.com
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