From: Robert L Mathews <lists@tigertech.com>
To: linux-raid@vger.kernel.org
Subject: Re: Reassembling RAID1 after good drive was offline [newbie]
Date: Mon, 05 Jan 2015 09:25:55 -0800 [thread overview]
Message-ID: <54AAC923.1070501@tigertech.com> (raw)
In-Reply-To: <54A9B472.9090905@youngman.org.uk>
On 1/4/15 1:45 PM, Wols Lists wrote:
> It's only the other raids that have any error correction ability,
> because they use parity etc to be able to tell which set of data is correct.
In theory, yes, but in practice, they don't -- or do they? I thought
that even if you use RAID 6, md doesn't check all members on each read
request, calculate parities, and mask silent platter-level corruption by
ignoring a member spewing bad bits. It just uses parities to fill in
missing data if a member fails.
Or does it actually do error detection, and I'm confused?
--
Robert L Mathews, Tiger Technologies, http://www.tigertech.net/
next prev parent reply other threads:[~2015-01-05 17:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-01 17:40 Reassembling RAID1 after good drive was offline [newbie] Aryeh Leib Taurog
2015-01-01 20:54 ` Robert L Mathews
2015-01-02 11:01 ` Anthonys Lists
2015-01-02 14:02 ` Aryeh Leib Taurog
2015-01-02 13:01 ` Aryeh Leib Taurog
2015-01-02 18:38 ` Robert L Mathews
2015-01-04 10:20 ` Aryeh Leib Taurog
2015-01-04 11:10 ` Peter Grandi
2015-01-04 21:07 ` Aryeh Leib Taurog
2015-01-04 21:45 ` Wols Lists
2015-01-05 17:25 ` Robert L Mathews [this message]
2015-01-05 18:54 ` NeilBrown
2015-01-07 8:30 ` Aryeh Leib Taurog
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