Re: @Degenerate Scumbag - ZFS is for dedicated file-servers
It works, is widely used, and has features like nothing else. Other attempts to match it have not succeeded. It does use chunks of memory, but then so would anything else doing the same job. And it's not like PCs are stuck with small amounts of RAM these days. There are unresolved licensing vaguenesses w.r.t. GPL2 (Linux) - but it's clearly alright for individuals to integrate it with their own Linux installations. Other open OSes have no problems with its license.
Saying, "don't use it", is like saying, "make do without its unique features" and isn't offering a viable alternative. Like it or not, Sun did do an excellent job of thinking anew about what storage had to do. People are using it because, yes, they've read the specs and can't really get those features from anything else. The reason why Ubuntu are going out on a slight limb is that they're responding to demand.