From: NeilBrown <neilb@suse.de>
To: Charles Polisher <cpolish@surewest.net>
Cc: linux-raid@vger.kernel.org
Subject: Re: Reshape RAID10 -> RAID1
Date: Wed, 26 Feb 2014 18:03:17 +1100 [thread overview]
Message-ID: <20140226180317.10790f0e@notabene.brown> (raw)
In-Reply-To: <20140226060532.GA18630@kevin.peecee3.com>
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On Tue, 25 Feb 2014 22:05:32 -0800 Charles Polisher <cpolish@surewest.net>
wrote:
> Hi all,
>
> I hope to reshape a RAID10 (near,2) with 2 failed and physically
> removed members [_U_U] into a RAID1 hopefully [UU], for the
> benefit of seeing a healthy status.
>
> Is following proposed invocation correct?
>
> mdadm --grow /dev/md2 --level=1
I think so. If not, mdadm will complain.
It is quite easy to experiment: create some largish file, use losetup to turn
them into block device. Then experiment with /dev/loop*
NeilBrown
>
> Details:
>
> root@mencius $ mdadm --query --verbose --detail /dev/md2
> /dev/md2:
> Version : 1.1
> Creation Time : Fri Jul 15 22:56:53 2011
> Raid Level : raid10
> Array Size : 1944916992 (1854.82 GiB 1991.59 GB)
> Used Dev Size : 972458496 (927.41 GiB 995.80 GB)
> Raid Devices : 4
> Total Devices : 2
> Persistence : Superblock is persistent
>
> Intent Bitmap : Internal
>
> Update Time : Tue Feb 25 22:00:46 2014
> State : active, degraded
> Active Devices : 2
> Working Devices : 2
> Failed Devices : 0
> Spare Devices : 0
>
> Layout : near=2
> Chunk Size : 512K
>
> Name : localhost.localdomain:2
> UUID : 971ee8b2:8d980355:0e5dfae9:c8bccd89
> Events : 5326341
>
> Number Major Minor RaidDevice State
> 0 0 0 0 removed
> 1 8 19 1 active sync /dev/sdb3
> 2 0 0 2 removed
> 3 8 3 3 active sync /dev/sda3
> root@mencius $ uname -a
> Linux mencius 2.6.32-358.18.1.el6.centos.plus.x86_64 #1 SMP Wed Aug 28 16:14:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
> root@mencius $ mdadm --version
> mdadm - v3.2.6 - 25th October 2012
>
>
> Thanks,
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next prev parent reply other threads:[~2014-02-26 7:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-26 6:05 Reshape RAID10 -> RAID1 Charles Polisher
2014-02-26 7:03 ` NeilBrown [this message]
2014-02-26 7:20 ` Charles Polisher
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