FreeBSD + ZFS on a production server?

[Wojciech Puchar]

> As you might have read, I have quite a lot of RAM available on this
> server (4GB), but ofcource I want the operating system to take as
> little as possible so that I have as much RAM as possible over for the
> server processes to work with (mostly web-server and mysql-server).

ZFS is memory and CPU eater. prepare that very few will be left for actual 
work ;)