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Date: Fri, 21 Aug 2009 12:04:28 -0500 (CDT)
From: Wes Morgan <morganw@chemikals.org>
To: Randy Bush <randy@psg.com>
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Cc: freebsd-fs <freebsd-fs@freebsd.org>
Subject: Re: re-adding a replacement into a pool of mirrors
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On Fri, 21 Aug 2009, Randy Bush wrote:

>> It might be worth zeroing the whole disk with dd if=/dev/zero
>> of=/dev/da1s3 bs=64k, and then see if you can re-attach.
>
> went single luser, zapped the drive, took a nap, then
>
>    zpool attach tank da0s3 da1s3
>
> worked.  so geom did have it!

I'm not sure geom had it more than the slice had a zfs label on it and as 
a foot-shooting precaution it did not want to let you add a device 
from another pool to the existing one. Just a guess, though. Was the 
replacement drive brand new?