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From: Neil Brown <neilb@suse.de>
To: LinuxKernel@jamesplace.net
Date: Fri, 13 Jul 2007 08:48:15 +1000
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Cc: linux-kernel@vger.kernel.org
Subject: Re: Problem recovering a failed RIAD5 array with 4-drives.
In-Reply-To: message from James on Thursday July 12
References: <200707120849.16068.LinuxKernel@jamesplace.net>
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On Thursday July 12, LinuxKernel@jamesplace.net wrote:
> 
> []# 
> mdadm --create --verbose /dev/md0 --assume-clean --level=raid5 --raid-devices=4 --spare-devices=0  /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
> 
snip
> 
>     Number   Major   Minor   RaidDevice State
>        0       8       17        0      active sync   /dev/sdb1
>        1       8       33        1      active sync   /dev/sdc1
>        2       8        1        2      active sync   /dev/sda1
>        3       8       49        3      active sync   /dev/sdd1

Something looks very wrong here.  You listed the devices to --create
in one order:
   a b c d
but that appear in the array in a different order
   b c a d

Did you cut/paste the command line into the mail, or did you retype
it?  If you retyped it, could you have got it wrong?

You need the order that --detail shows to match the order of the
original array....

NeilBrown