ZFS is the new Solaris file System, it include many features and benefits that no other file system has.
Filesystems where historically build over the physical devices. ZFS utilizes virtualized volumes, it aggregates devices into a storage pool. The storage pool has the information of the physical storage (device layout, data redundancy, etc).
Because of its mechanism of managing the operating system transactions, the file system is never corrupted because of a power outage or system crash, this means also that fsck is no more needed.
Sun announced that ZFS was included in the 6/06 update to Solaris 10 in June 2006, one year after the opening of the OpenSolaris community.
* Hierarchical file system layout
* Property inheritance
* Automanagement of mount points
* NFS share semantics
To learn more about ZFS, go to docs.sun.com