http://forums.freebsd.org/archive/index.php/t-1197.html

Is a fairly good writeup on this subject...  The short and sweet:  One 
disk in a non-mirrored pool dies and is replaced with a new disk...

It looks like zpool scrub is able to recover from an error of this 
magnitude, but getting it to import in the first place requires a bit of 
hackery and some saved information...  I'm curious if there are future 
plans to allow forced importing of a damaged set of disks such as this 
so that they can be scrubbed and recovered.  Also if ZFS will allow a 
forced import *without* a replacement...  And will that be part of disk 
removal per future release (In the FAQ): 
http://opensolaris.org/os/community/zfs/faq/#deviceremoval

Thanks,
-Tim

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