From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Klauer <Andreas.Klauer@metamorpher.de>
Subject: Re: restore 3disk raid5 after raidpartitions have been setup with
 xfs filesystem by accident
Date: Wed, 21 Sep 2016 21:00:35 +0200
Message-ID: <20160921190035.GA6949@metamorpher.de>
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To: Simon Becks <beckssimon5@gmail.com>
Cc: Linux-RAID <linux-raid@vger.kernel.org>
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On Wed, Sep 21, 2016 at 08:31:23PM +0200, Simon Becks wrote:
> Maybe i just assembled it in the wrong order?

Yes, or maybe the superblock was overwritten by XFS after all.

You could check what's at offset 1M for each disk.

losetup --find --show --read-only --offset=$((2048*512)) /the/disk
file -s /dev/loop42

If the superblock was still intact it should say ext4 or whatever 
your filesystem was for at least one of them.

You can also try this for the disk you removed 2 month ago.

If that is not the case and fsck with backup superblock also 
is not successful then you'll have to see if you find anything 
valid in the raw data.

Regards
Andreas Klauer