Are there some alignment settings when creating filesystem on RAID5 array which can improve performance?

Hi, everybody:
I have a machine and centos 5.2 installed on it. I have created a
RAID5 array with five SATA disks, then I create LVM on this array.
#pvcreate /dev/md0
#vgcreate myvg /dev/md0
#lvcreate -n mylv myvg
As you see, I want to use XFS or ReiserFS on "mylv" volume. I wonder
if there are some alignment settings when creating such file systems
so that a better R/W performance can be achieved. Thx in advance.


-- 
The simplest is not all best but the best is surely the simplest!