I am not worried about the filesystem as the defaults usually get it 
right but with parted, this is the first time I had to use it for home 
use and with RAID-6 I am noticing slower performance with 15 disks (1 is 
a spare) in RAID-6 (albeit slower 7200 ones, RE3s) than I was getting 
with 10 raptor150s in RAID-6 (but I had used fdisk there).

Justin.

For best effect - partition should start at 1920th sector (stripe width
boundary), and su/sw should be appropriately set - su=64k,sw=13 in your
case. Parted shows the values normally - from the beginning of the 
volume, 0 based.


ps.

I dropped some of CCs.