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Date: Mon, 16 Jun 2008 18:16:12 +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:
> Hello,
>
> Manolis Kiagias:
>
>> Try
>>
>> atacontrol status ar0
>
> ar0: ATA RAID1 status: DEGRADED
>  subdisks:
>    0 ad10 ONLINE
>    1 ---- MISSING
>
>> Since you haven't actually removed/replaced ad12 you may simply have 
>> to continue with:
>>
>> atacontrol rebuild ar0
>
> I'll try it now. Thanks!
>
> Zbigniew Szalbot

Ok, ad12 is missing, so it seems it was detached but not reattached.

try again:

atacontrol attach ata6

If this succeeds,

atacontrol addspare ar0 ad12
atacontrol rebuild ar0

If attach fails, then someone at the remote site may have to  physically 
detach / reattach the disk in question.