sabayonuser@sabayonx86-64 ~ $ sudo mkswap /dev/sda2
Setting up swapspace version 1, size = 2048090 kB
no label, UUID=63d4ebd0-732b-4d89-9f83-110543b44e7d
sabayonuser@sabayonx86-64 ~ $ sudo swapon /dev/sda2
swapon: /dev/sda2: Invalid argument