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From: Neil Brown <neilb@suse.de>
To: LinuxKernel@jamesplace.net
Date: Fri, 13 Jul 2007 09:21:57 +1000
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Subject: Re: Problem recovering a failed RIAD5 array with 4-drives.
In-Reply-To: message from James on Thursday July 12
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On Thursday July 12, LinuxKernel@jamesplace.net wrote:
> 
> I don't know the original order of the array before all the problems started. 
> 
> Is there a way to determine the original order? 

No, unless you have some old kernel logs of the last time it assembled
the array properly.
The one thing that "--create" does destroy is the information about
any previous array that the drives were a part of.

> 
> The order that --detail is showing now is the order that appeared after 
> issuing the command is it is in the email. (ie: a b c d)

Odd.  I cannot reproduce it.
I suggest you try different arrangements (of the 3 good drives and the
word 'missing') until you find one that 'fsck -n' likes.

NeilBrown