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Date: Mon, 16 Jun 2008 18:06:41 +0300
From: Manolis Kiagias <sonic2000gr@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: RAID 1 / disk error / Offline uncorrectable sectors
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Zbigniew Szalbot wrote:
> Hi Manolis,
>
>
>> Yes, it is ata6
>> Give it a try, if the problem is serious enough, it will probably not 
>> even finish rebuild :(
>
> Detaching and ataching went well but when I issued
> atacontrol addspare ar0 ad12
> it said
> atacontrol: ioctl(IOCATARAIDADDSPARE): Device busy
>
> I am not sure if that means I should wait or rather that it is mission 
> impossible?
>
> Thanks!
>
> Zbigniew Szalbot

Try

atacontrol status ar0

Since you haven't actually removed/replaced ad12 you may simply have to 
continue with:

atacontrol rebuild ar0

but see what status says first.