- https://github.com/zfsonlinux/zfs/issues/2438
 - https://github.com/zfsonlinux/zfs/issues/3500
 - https://github.com/zfsonlinux/zfs/pull/3542
"Cohabiting FreeBSD and Gentoo Linux on a Common ZFS Pool"
a zfs volume is something completely different.
To elaborate, a zfs volume (zvol) is a chunk of a zfs pool used as a block device.
The article uses "zfs volume" and "zfs pool" interchangeably, but they are completely different things.