[fedora-virt] Extra Image Space, how?

[Frank Murphy]

As my default image space is almost full

  /dev/md0 => 99% Used. Warning. Disk Filling up.

I now want to add empty drives as new image space
/dev/sdc, /dev/sdd  (unformatted as yet, 320gb each)

What's the best method, as the host F14 has selinux-enforcing.
And I don't want to make a mess.

Google hasn't helped much for me:
http://tinyurl.com/2wu5d9q

-- 
Regards,

Frank Murphy
UTF_8 Encoded
Friend of Fedora