From owner-freebsd-geom@FreeBSD.ORG  Fri May 11 12:59:32 2012
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Date: Fri, 11 May 2012 13:59:35 +0100
From: Karl Pielorz <kpielorz_lst@tdx.co.uk>
To: Alexander Motin <mav@FreeBSD.org>
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Cc: freebsd-geom@FreeBSD.org
Subject: Re: FreeBSD 9-R amd64 - graid, should it survive 'pulling' a disk?
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--On 11 May 2012 14:32 +0300 Alexander Motin <mav@FreeBSD.org> wrote:

> Yes, sometimes bubble and in rare cases panic. I am working on the first
> part right now.
>
>> Is the same true for reads?
>
> No, On read error graid repeats reading from another disk and does
> remapping write to the original one. Error returned only if all reads
> have failed.

Ok, thanks for the explanation - if you need anything testing, do let me 
know, as it's obviously a pretty big issue for us [and probably others] :)

-Karl