The new Zettabyte File systems (ZFS), has been a part with Solaris 10 and OpenSolaris Operating Systems. As the name suggests, the filesystems offers immense scalability apart from a bunch of other features.
Pawel Jakub Dawidek announced the support for this filesystem in FreeBSD 7.0-RELEASE, as an experimental feature. Apart from some missing features like ACLs, and booting off ZFS, the filesystem is fully functional with this FreeBSD release.