ZFS is a new and high-performance filesystem devised by Sun Microsystems (now Oracle) for the Solaris unix operating system. It has been ported to FreeBSD as well.

ZFS server systems:

• FreeNAS
  • http://www.freenas.org/
• Nexenta
  • http://www.nexenta.com
  • http://www.nexentastor.org
• OpenIndiana + Napp-it
  • http://wiki.openindiana.org/oi/napp-it,+ready+to+use+NAS+SAN+storage+server+with+WEB-GUI

http://forums.freenas.org/showthread.php?158-What-number-of-drives-are-allowed-in-a-RAIDZ-config

http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#RAIDZ_Configuration_Requirements_and_Recommendations