Monday 13th August 2012: 4.50pm. Fairly nervewracking deliberately hosing your external USB drive containing all your stuff, but it's done now:
[root@freenas]/mnt/IcyBoxZ# zpool status -v
status: One or more devices is currently being resilvered. The pool will
continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
scan: resilver in progress since Mon Aug 13 17:07:21 2012
170G scanned out of 1.70T at 69.4M/s, 6h26m to go
170G resilvered, 9.74% done
NAME STATE READ WRITE CKSUM
IcyBoxZ ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gptid/6cb70442-e3e1-11e1-b794-020934a5fbce ONLINE 0 0 0
gptid/97632a3c-e55f-11e1-bd01-020934a5fbce ONLINE 0 0 0 (resilvering)
gptid/f1a12bff-e3e3-11e1-b794-020934a5fbce ONLINE 0 0 0
errors: No known data errors
Good, that's another pre-Canada todo item ticked off. Getting close to ready to emigrate now :)