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Date: Sun, 8 Apr 2012 19:09:30 +0200
From: Heinz Diehl <htd@fancy-poultry.org>
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Subject: Re: [dm-crypt] can't open luks device after raid 5 rebuild
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On 08.04.2012, artificial11000 wrote: 

>  mdadm --create --level=5 -n 3 /dev/md127 /dev/sdb /dev/sdc /dev/sdd
         ---------

Seems your data is gone, forever. You created a new raid manually,
which means that you deleted all your previous data. 

You have a backup, do you?