From mboxrd@z Thu Jan  1 00:00:00 1970
From: Phil Turmel <philip@turmel.org>
Subject: Re: Broken array, trying to assemble enough to copy data off
Date: Thu, 10 Oct 2013 13:58:15 -0400
Message-ID: <5256EAB7.9000500@turmel.org>
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To: Digimer <lists@alteeve.ca>
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On 10/10/2013 12:54 PM, Digimer wrote:
>> Phil
> 
> What if I don't have rock-solid knowledge? Is there a way to connect the
> four drives and query them to determine which is which? I was using the
> new system (minus the new drives) plus a spare new 500GB drive with the
> fresh centos install to do the testing yesterday. I am pretty sure I can
> redo the cabling to match, but I always prefer safe over sorry. :)

Your mdadm -E reports clearly identified the order for the device names
at that moment.  You can replug drives and query them again if you like.
 Look for "Device Role :" in the output of "mdadm -E".  The numbering
starts with zero.

> Thanks very much for your help so far!

You are welcome.

Phil