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From: Mark Lord <mlord@pobox.com>
To: Ondrej Zary <linux@rainbow-software.org>
Cc: Pavel Machek <pavel@ucw.cz>,
	Marcus Overhagen <marcus.overhagen@gmail.com>,
	kernel list <linux-kernel@vger.kernel.org>,
	linux-ide@vger.kernel.org, tj@kernel.org
Subject: Re: SATA hdd refuses to reallocate a sector?
Date: Mon, 24 Jun 2013 08:18:15 -0400	[thread overview]
Message-ID: <51C83907.2020202@pobox.com> (raw)
In-Reply-To: <201306240914.29502.linux@rainbow-software.org>

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@pobox.com

  parent reply	other threads:[~2013-06-24 12:18 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-23 10:19 SATA hdd refuses to reallocate a sector? Pavel Machek
2013-06-23 11:21 ` Pavel Machek
2013-06-23 13:16   ` Marcus Overhagen
2013-06-23 19:00     ` Pavel Machek
2013-06-23 21:27       ` Mark Lord
2013-06-23 21:51         ` Pavel Machek
2013-06-23 22:35           ` Mark Lord
2013-06-24  6:19             ` Marcus Overhagen
2013-06-24 12:28               ` Pavel Machek
2013-06-24  7:14           ` Ondrej Zary
2013-06-24 11:06             ` Pavel Machek
2013-06-24 12:18             ` Mark Lord [this message]
2013-06-26  3:04               ` James Bottomley
2013-06-26  6:11                 ` Ondrej Zary
2013-06-29 18:47             ` Henrique de Moraes Holschuh
2013-06-29 23:02               ` Mark Lord
2013-06-30 14:34                 ` Henrique de Moraes Holschuh
2013-06-30 16:49                   ` Pavel Machek
2013-07-01 13:28                     ` Henrique de Moraes Holschuh
2015-04-30 19:01         ` Pavel Machek
2013-06-24 12:48 ` Zdenek Kaspar
2013-06-24 13:08   ` Ondrej Zary

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