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From: Randy Bush <randy@psg.com>
To: Andrew Snow <andrew@modulus.org>
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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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> 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!

thanks!

randy