RAID 5 stripe size and newfs args

[Kevin Taber]

OS: FreeBSD 6.1
Hardware: HP DL380 G4, 3.2Ghz Xeon EM64T, Smart Array 6i, 3GB RAM, 2 logical
drives: 2 x 36GB Ultra320 15k and 4 x 146GB Ultra320 10k
RAID setup in question: 4 x 146GB Ultra320 drives ( roughly 300GB raid 5 )


I'm setting this array up for samba use... Windows 2003 folders will
redirect to a share.  I'm going with a raid stripe size of 128KB, what
should my newfs args be (looking for -b -f info)?  I have heard mixed
answers via IRC.

Thanks in advance,

Kevin