Create a swap slice on FreeNAS/FreeBSD
List the available devices to select the device name:
# camcontrol devlist
Use gpart to list slices. If the device has a pre-existing parition table then clean the device by filling it with zeros.
# gpart list da0
Create a GUID parition table:
# gpart create -s gpt da0
Create a swap slice (partition):
# gpart add -t freebsd-swap -s 16G da0
$ swapinfo Device 1K-blocks Used Avail Capacity /dev/ada3s3 67103504 0 67103504 0%
