raid1

[Spades]

hi, my server hardware supports hardware raid, i installed it
as per normal freebsd 5.3, however i see no difference
in df. its using 2 x 160GB, what do i do during the installation
to enable the raid?

mobo: 
http://www.supermicro.com/products/motherboard/Xeon800/E7320/X6DVL-EG.cfm

-bash-2.05b$ df
Filesystem  1K-blocks   Used    Avail Capacity  Mounted on
/dev/ad4s1a  66008394  35424 60692300     0%    /
devfs               1      1        0   100%    /dev
/dev/ad4s1d  66008394     24 60727700     0%    /home
/dev/ad4s1e  10154158 683442  8658384     7%    /usr
/dev/ad4s1f   8172302    982  7517536     0%    /var
-bash-2.05b$