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gpart create -s gpt /dev/da4

gpart add -a 4k -i 1 -s 2g -t freebsd-swap /dev/da4
gpart add -a 4k -i 2 -t freebsd-zfs /dev/da4

glabel status | grep da4

zpool attach personal gptid/302d8674-8532-11e7-81f4-3c4a92f7783c gptid/f23b85d2-854a-11e7-81f4-3c4a92f7783c