From mboxrd@z Thu Jan  1 00:00:00 1970
From: Phil Turmel <philip@turmel.org>
Subject: Re: Converting 4 disk RAID10 to RAID5
Date: Tue, 27 Oct 2015 08:13:43 -0400
Message-ID: <562F6A77.20502@turmel.org>
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To: Adam Goryachev <mailinglists@websitemanagers.com.au>, Anugraha Sinha <asinha.mailinglist@gmail.com>, linux-raid@vger.kernel.org
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On 10/27/2015 02:32 AM, Adam Goryachev wrote:
> On 27/10/15 17:19, Anugraha Sinha wrote:
\
>> This will restart your array with the required raid-level and also
>> start the resyncing process.

You shouldn't have needed to stop it.

> I got:
> mdadm: Failed to restore critical section for reshape, sorry.
> Possibly you needed to specify the --backup-file

Probably just need "mdadm /dev/md0 --grow --continue --backup-file=...."

where .... is a file location outside the array.  You may also need
--invalid-backup

Phil