From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: Backup file size when migrating from raid5 to raid6?
Date: Thu, 18 Jul 2013 06:51:59 +1000
Message-ID: <20130718065159.0a40207e@notabene.brown>
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To: Boyan Alexiev <alexiev@resonance.bg>
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On Wed, 17 Jul 2013 13:01:15 +0000 (UTC) Boyan Alexiev <alexiev@resonance.b=
g>
wrote:

> If You have array with 9 devices and add another one You may at same time
> grow array and change raid level. In this case You not need backup file.
> Please try this:
> mdadm --grow /dev/md0 --raid-devices=3D10 --level=3D6=20
>=20

You can only skip the backup file if you  are increasing the number of *dat=
a*
devices.  I don't think your example does that.

(However with mdadm-3.3 this problem goes away if you have a new enough
kernel).

NeilBrown

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