content: Dont know where you have been but ZFS does some pretty cool stuff.  Try it out before you say "woo yet another fs".  I will note that it has its roots in SUN, As in.. Well before the big Eye-0-Sauron took over.. Since then, Linux has had community support for it.  It is a powerful tool that should not be ignored just because "LOL UBUNTU DOEZ IT! NOT REALZ BRO!".