FreeBSD 7.0

which includes production quality (as some people say) Sun’s Z F S has been released

ZFS Highlights

Rock-solid data integrity. All data is protected by 256-bit checksums, data consistency is maintained at all times
Unprecedented manageability. Eliminates the need for volume manager, GUI automates administrator intent
Mind-boggling scalability. 128-bit file system, 16 billion billion times the capacity of 32- or 64-bit file systems
Breathtaking speed. Proven, cutting-edge technologies combine to optimize performance