Re: mdadm 3.1.1: level change won't start

[Robin Hill <robin@robinhill.me.uk>]

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On Mon Dec 21, 2009 at 03:41:33AM +0000, Kristleifur Daðason wrote:

> Hi all,
> 
> I wish to convert my 3-drive RAID-5 array to a 6-drive RAID-6. I'm on
> Linux 2.6.32.2 and have mdadm version 3.1.1 with the 32-bit-array-size
> patch from here: http://osdir.com/ml/linux-raid/2009-11/msg00534.html
> 
> I have three live drives and three spares added to the array. When I
> initialize the command, mdadm does the initial checks and aborts with
> a "cannot set device shape" without doing anything to the array.
> 
> $ mdadm --grow /dev/md_d1 --level=6 --raid-devices=6
> --backup-file=/root/backup.md1_to_r6
> mdadm: metadata format 1.10 unknown, ignored.
> mdadm: metadata format 1.10 unknown, ignored.
> mdadm level of /dev/md_d1 changed to raid6
> mdadm: Need to backup 1024K of critical section..
> mdadm: Cannot set device shape for /dev/md_d1
> mdadm: aborting level change
> 
I don't think you can grow and reshape simultaneously.  I think you'll
need to do this as two operations - either grow to a 5 disk RAID5 then
reshape to a 6 disk RAID6, or reshape to a 4 disk RAID6 then grow.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
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