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From: Lennert Buytenhek <buytenh@wantstofly.org>
To: Neil Brown <neilb@cse.unsw.edu.au>
Cc: linux-kernel@vger.kernel.org
Subject: read-from-all-disks support for RAID1?
Date: Sat, 10 Sep 2005 14:39:02 +0200	[thread overview]
Message-ID: <20050910123902.GA9461@xi.wantstofly.org> (raw)

(please CC on replies)

Hi!

I recently had a case where one disk in a two-disk RAID1 array went
subtly bad, effectively refusing to write to certain sectors without
reporting an error.  Basically, parts of the disk went undetectably
read-only, causing file system corruption that wouldn't go away after
fsck, and all kinds of other fun.

Would it be hard/wise to add an option for RAID1 mode to read from all
devices on a read, and report an error to syslog or simply return an
I/O error if there is a mismatch?  (Or use majority voting and tell
people to use 3-disk RAID1 arrays from now on ;-)


thanks,
Lennert

             reply	other threads:[~2005-09-10 12:39 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-10 12:39 Lennert Buytenhek [this message]
2005-09-11  8:55 ` read-from-all-disks support for RAID1? Kalin KOZHUHAROV
2005-09-11  9:29 ` Eyal Lebedinsky
2005-09-11 23:52 ` Neil Brown
2005-09-12  0:22   ` Jesper Juhl
2005-09-12  0:36     ` Neil Brown
2005-09-12  1:32       ` Bernd Eckenfels
2005-09-12  2:15   ` Lennert Buytenhek

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