How to replace a ZFS drive

# Put drive offline
sudo zpool tank da3 offline

# Partition drive
sudo gpart create -s gpt da3
sudo gpart add -s 100M -t freebsd-swap da3
sudo gpart add -t freebsd-zfs da3

# Replace drive in pool
sudo zpool replace tank 3763600677225397619 /dev/da3p2