From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Subject: Re: [PATCH 0/1] Make failure message on re-add more explcit
Date: Thu, 23 Feb 2012 09:34:34 +0100
Message-ID: <4F45FA1A.2020706@redhat.com>
References: <1329930000-20679-1-git-send-email-Jes.Sorensen@redhat.com> <20120223090412.2b14fb7f@notabene.brown> <4F457758.8060807@redhat.com> <4F459D05.5060104@anonymous.org.uk>
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To: John Robinson <john.robinson@anonymous.org.uk>
Cc: NeilBrown <neilb@suse.de>, linux-raid@vger.kernel.org
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On 02/23/12 02:57, John Robinson wrote:
> On 22/02/2012 23:16, Jes Sorensen wrote:
> [...]
>> The goal was to try and reduce the number of bug reports over this by
>> making it more obvious/explicit, so if you have a suggestion for how to
>> do so in a better way, I am all game.
> 
> How about:
> 
> mdadm /dev/md0 --add %s
> : %s was already a member of /dev/md0, attempting re-add
> : Re-add failed because <reason>
> : Not performing add as that would zero the superblock on %s and make it
> a spare
> : mdadm --add used to do that automatically but it was potentially
> dangerous
> : If that is what you really want to do, use mdadm --zero-superblock %s
> first.
> 

This would get my vote, way better than my messy attempt.

Cheers,
Jes