From owner-freebsd-questions@FreeBSD.ORG  Wed Aug 11 05:28:14 2010
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Date: Wed, 11 Aug 2010 07:28:21 +0200
From: Dick Hoogendijk <dick@nagual.nl>
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Subject: Re: ZFS woes
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  On 11-8-2010 7:05, Dick Hoogendijk wrote:
>  On 11-8-2010 0:52, Dale Scott wrote:
[cut the former message..]

I just found out that the process to repair offending disks with GEOM 
errors, bad labels etc.. can be repaired a lot quicker.

# gmirror label -vb round-robin gm0 /dev/ad12  ## -- disk with vdev error
# gmirror stop gm0
# gmirror clear /dev/ad12
# if=/dev/zero of=/dev/ad12 bs=1m count=1     ## -- removes all 
partition data

This leaves me with a completely healthy disk that makes zfs happy ;)
Repeat for all other "faulthy" disks.