From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sarah Newman <srn@prgmr.com>
Subject: Re: Fwd: RAID6 Array crash during reshape.....now will not
 re-assemble.
Date: Thu, 3 Mar 2016 09:48:24 -0800
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To: Another Sillyname <anothersname@googlemail.com>, Linux-RAID <linux-raid@vger.kernel.org>
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On 03/03/2016 06:07 AM, Another Sillyname wrote:
> Plenty of hits....but no clear fixes and as I said I'm not willing to
> 'try' things from google hits until someone with better insight can
> give me a view.
> 
> Trying things is fine in many instances, but not with a 20+TB data set
> as I'm sure you can understand.
> 

I have not tried this personally, but it may be of interest:
https://raid.wiki.kernel.org/index.php/Recovering_a_failed_software_RAID#Making_the_harddisks_read-only_using_an_overlay_file I found this explanation
of the dmsetup commands to be more easy to follow: http://www.flaterco.com/kb/sandbox.html