https://github.com/zfsonlinux/pkg-zfs/wiki/HOWTO-use-a-zvol-as-a-swap-device
..there are known issues with swap on ZFS not working well on heavily memory loaded systems.
https:/ /github. com/zfsonlinux/ pkg-zfs/ wiki/HOWTO- use-a-zvol- as-a-swap- device
..there are known issues with swap on ZFS not working well on heavily memory loaded systems.