From: Matthias Urlichs <matthias@urlichs.de>
To: linux-raid@vger.kernel.org
Subject: Re: Re-map disk sectors in userspace when rewriting after read errors
Date: Tue, 15 Sep 2009 07:29:18 +0000 (UTC) [thread overview]
Message-ID: <h8nfoe$n8p$3@ger.gmane.org> (raw)
In-Reply-To: alpine.LFD.2.00.0909150810510.5083@sbhezbfg.of5.nffheflf.cev
On Tue, 15 Sep 2009 08:13:08 +0100, Alex Butcher wrote:
> IME, discs don't remap after read errors, only on writes.
Some may remap after recoverable read errors. However, the RAID code
does (I assume - see below) rewrite the data -- which the disk happily
acknowledges -- only to report the very same error next time that spot's
being read. :-(
> Are you sure that refresh-writes triggered by read errors are expected
> behaviour of md's RAID5/6 mode?
Not 100%, no -- but recovering the data but otherwise ignoring the error
(other than increment the error counter) would be a level of foolishness
I won't assume of the RAID code's authors.
--
Matthias Urlichs
next prev parent reply other threads:[~2009-09-15 7:29 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-15 6:23 Re-map disk sectors in userspace when rewriting after read errors Matthias Urlichs
2009-09-15 6:45 ` berk walker
2009-09-15 7:23 ` Matthias Urlichs
2009-09-15 7:13 ` Alex Butcher
2009-09-15 7:29 ` Matthias Urlichs [this message]
2009-09-15 7:37 ` Alex Butcher
2009-09-15 10:48 ` Matthias Urlichs
2009-09-16 9:41 ` Goswin von Brederlow
2009-09-16 13:13 ` Matthias Urlichs
2009-09-18 8:17 ` Majed B.
2009-09-18 8:28 ` Robin Hill
2009-09-18 9:57 ` Majed B.
2009-09-18 10:22 ` Robin Hill
2009-09-18 10:52 ` Majed B.
2009-09-18 11:15 ` Robin Hill
2009-09-18 11:35 ` Matthias Urlichs
2009-09-18 17:44 ` John Robinson
2009-09-18 18:02 ` Greg Freemyer
2009-09-18 20:13 ` Majed B.
2009-10-02 13:55 ` Bill Davidsen
2009-09-15 10:40 ` Majed B.
2009-09-15 10:52 ` Matthias Urlichs
2009-09-15 11:03 ` Majed B.
2009-09-15 17:02 ` Majed B.
2009-09-15 18:05 ` Matthias Urlichs
2009-09-15 18:14 ` Majed B.
2009-09-15 18:44 ` Matthias Urlichs
2009-09-16 9:31 ` Majed B.
2009-09-16 9:44 ` Matthias Urlichs
2009-09-16 9:52 ` Majed B.
2009-09-16 13:05 ` Alex Butcher
2009-09-16 10:00 ` Robin Hill
2009-09-16 10:07 ` Majed B.
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