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See also Shared Storage System.
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.
http://forums.freenas.org/showthread.php?7775-Slideshow-explaining-VDev-zpool-ZIL-and-L2ARC-for-noobs!
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
http://www.nexentastor.org/boards/1/topics/972