From: Wols Lists <antlists@youngman.org.uk>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-xfs@vger.kernel.org, linux-raid@vger.kernel.org
Subject: Re: Growing RAID10 with active XFS filesystem
Date: Tue, 9 Jan 2018 09:36:49 +0000 [thread overview]
Message-ID: <5A548D31.4000002@youngman.org.uk> (raw)
In-Reply-To: <20180108220139.GB16421@dastard>
On 08/01/18 22:01, Dave Chinner wrote:
> Yup, 21 devices in a RAID 10. That's a really nasty config for
> RAID10 which requires an even number of disks to mirror correctly.
> Why does MD even allow this sort of whacky, sub-optimal
> configuration?
Just to point out - if this is raid-10 (and not raid-1+0 which is a
completely different beast) this is actually a normal linux config. I'm
planning to set up a raid-10 across 3 devices. What happens is that is
that raid-10 writes X copies across Y devices. If X = Y then it's a
normal mirror config, if X > Y it makes good use of space (and if X < Y
it doesn't make sense :-)
SDA: 1, 2, 4, 5
SDB: 1, 3, 4, 6
SDC: 2, 3, 5, 6
Cheers,
Wol
next prev parent reply other threads:[~2018-01-09 9:36 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-08 19:08 Growing RAID10 with active XFS filesystem xfs.pkoch
2018-01-08 19:26 ` Darrick J. Wong
2018-01-08 22:01 ` Dave Chinner
2018-01-08 23:44 ` mdraid.pkoch
2018-01-08 23:44 ` xfs.pkoch
2018-01-09 9:36 ` Wols Lists [this message]
2018-01-09 21:47 ` IMAP-FCC:Sent
2018-01-09 22:25 ` Dave Chinner
2018-01-09 22:32 ` Reindl Harald
2018-01-10 6:17 ` Wols Lists
2018-01-11 2:14 ` Dave Chinner
2018-01-12 2:16 ` Guoqing Jiang
2018-01-10 14:10 ` Phil Turmel
2018-01-10 21:57 ` Wols Lists
2018-01-11 3:07 ` Dave Chinner
2018-01-12 13:32 ` Wols Lists
2018-01-12 14:25 ` Emmanuel Florac
2018-01-12 17:52 ` Wols Lists
2018-01-12 18:37 ` Emmanuel Florac
2018-01-12 19:35 ` Wol's lists
2018-01-13 12:30 ` Brad Campbell
2018-01-13 13:18 ` Wols Lists
2018-01-13 0:20 ` Stan Hoeppner
2018-01-13 19:29 ` Wol's lists
2018-01-13 22:40 ` Dave Chinner
2018-01-13 23:04 ` Wols Lists
2018-01-14 21:33 ` Wol's lists
2018-01-15 17:08 ` Emmanuel Florac
-- strict thread matches above, loose matches on Subject: below --
2018-01-08 19:06 mdraid.pkoch
2018-01-06 15:44 mdraid.pkoch
2018-01-07 19:33 ` John Stoffel
2018-01-07 20:16 ` Andreas Klauer
2018-01-08 7:31 ` Guoqing Jiang
2018-01-08 15:16 ` Wols Lists
2018-01-08 15:34 ` Reindl Harald
2018-01-08 16:24 ` Wolfgang Denk
2018-01-10 1:57 ` Guoqing Jiang
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