How to replace a ZFS drive

# Put drive offline
sudo zpool tank da3 offline

sudo gpart destroy -F da7

# Partition drive
sudo gpart create -s gpt da7
sudo gpart add -s 100M -t freebsd-swap da7
sudo gpart add -t freebsd-zfs da7

# Replace drive in pool
sudo zpool replace -f tank 16950429292085325612 /dev/da7p2