From: Neil Brown <neilb@suse.de>
To: Vidar Sonerud <vidar.sonerud@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Raid-1 to Raid-5 conversion possible?
Date: Thu, 25 Jan 2007 09:39:45 +1100 [thread overview]
Message-ID: <17847.57393.35146.578984@notabene.brown> (raw)
In-Reply-To: message from Vidar Sonerud on Wednesday January 24
On Wednesday January 24, vidar.sonerud@gmail.com wrote:
> I have for a long time been wondering if it is possible to convert a 2
> disk Raid-1 array to a 3 disk Raid-5 array using mdadm?
>
> Tonight I stumbled upon this article:
>
> http://www.n8gray.org/blog/2006/09/05/stupid-raid-tricks-with-evms-and-mdadm/
>
> Is this safe / ok to do? Any comments from you mdadm experts?
Yes, that should be safe - in principle.
I've never used EVMS tools so I cannot comment on the particular
commands that the article says to run.
I would do it with mdadm:
1/ stop the array
mdadm -S /dev/md0
2/ Recreated as a RAID5 array
mdadm -C /dev/md0 -l5 -n2 --assume-clean /dev/sda1 /dev/sdb1
3/ Add a spare
mdadm /dev/md0 -a /dev/sdc1
4/ Grow the array
mdadm -G /dev/md0 -n 3
all done.
Of course you have to change the device names to fit your hardware.
NeilBrown
prev parent reply other threads:[~2007-01-24 22:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-24 22:33 Raid-1 to Raid-5 conversion possible? Vidar Sonerud
2007-01-24 22:39 ` Neil Brown [this message]
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