From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: [md PATCH 00/24] Allow bitmaps to be resized.
Date: Wed, 18 Apr 2012 13:35:05 +1000
Message-ID: <20120418133505.7350f98a@notabene.brown>
References: <20120417084324.6433.68345.stgit@notabene.brown>
	<CA+res+S-pvi11i_JH=O2dDGMc3n2wErwpMaWoW3KKFsAHVMN3Q@mail.gmail.com>
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To: Jack Wang <jack.wang.usish@gmail.com>
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On Wed, 18 Apr 2012 10:07:37 +0800 Jack Wang <jack.wang.usish@gmail.com>
wrote:

> Dear Neil,
>=20
> Thanks for your good works.
> One query about current grow supporting  status:
>=20
> as the raid wiki show : the RAID level 1/4/5/6 array can be grown . In
> my test I can grow raid 1 add disk or remove disk through mdadm grow,
> but change level from 1 to 4 or 5 will fail. the simaliar command work
> for change level between 4/5/6, change 1 to 10 fail too.
>=20
> My kernel version is 3.2.15. mdadm version 3.2.3.

You can definitely change from RAID1 to RAID5 and I think to RAID4.
But you are right that you cannot change RAID1 to RAID10 yet.  That should =
be
easy enough to add, and now that RAID10 can be reshaped, it would make sens=
e.

NeilBrown


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