it does speed up, i was actually doing it wrong with using IE as my browser for openfiler (use firefox), so i was actually synchronizing while i was moving the vm, that's why it's so slow and IE didn't show that (and also deleting volumes, share and raid, doesn't work with using IE). you should let the raid sync done first before doing anything on the volumes. i tested nfs vs iscsi, iscsi much is faster with the same chunk of 16k vs nfs-chunk 16 and of course i put two path on openfiler but still piping through 1G NIC (doesn't make sense, right! but it speed up than one path anyways). what should be the speed if i put it to 8k chunk? but im tired of doing this. i'm happy with the speed for now... ah i put raid 10 with 4x 1TB hard drive with 32m cache each and all the same brand of disk.
i heard freenas is faster than openfiler...