please critique my zfs-fuse setup - wiki to follow - help needed

view full story

https://bbs.archlinux.org – Hi all,I am writing a new wiki for zfs-fuse that will hopefully find a niche and help others. I am having a couple rough spots:For example im trying to figure out why when i do a # zpool create pool /dev/sdb /dev/sdc /dev/sdd /dev/sde with a 2TB, 750GB, 750GB, 500GB that the end file size comes out ~3.5TB instead of 4TB, and likewise when i create with a 2TB, 500GB, 500GB the drive size comes out ~2.68TB.......  Does the zpool automatically use the smallest drive as a cache drive or something? Or am i just that bad at 1024*1024*xxx   Another question i am having is what role d (HowTos)