On Fri May 08, 2015 at 11:18:44AM +0200, Hans Kraus wrote:
> Hi,
>
> I have a Raid 1 with 3 drives, the following layout (the internal
> bitmap is already removed):
> -----------------------------------------------------------------
> md20 : active raid1 sdj1[2] sdi1[1] sdn1[0]
> 732442432 blocks super 1.2 [3/3] [UUU]
> -----------------------------------------------------------------
> I tried to change it to Raid 5, but I'm getting aways an error.
> -----------------------------------------------------------------
> mdadm --grow /dev/md20 --level=5 --raid-devices=3 -c 32 \
> --backup-file=/home/kraush/work/raidLevelChange
>
> Impossibly level change request for RAID1
> -----------------------------------------------------------------
> I tried it with various permutations (+/- raid-devices, c, ...).
>
> Is something in my command wrong or is the level change not
> possible?
> This is on Debian 7, mdadm - v3.3-65-g2167de7 - 11th March 2014
>
I think you'll need one of the disks to be spare first. Try reducing the
RAID1 to a 2-disk plus spare configuration, then rerunning the grow.
Alternately you'd need to add a new disk as a spare first, then grow to
a 4 disk RAID5.
HTH,
Robin
--
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( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
/ / ) | Little Jim says .... |
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