When I make a volume using 1 18GB disk and then
use another 18GB disk to make a RAID 0+1 configuration with that volume
it says I cannot do it because there is not enough space,
but, I am able to do mirroring, could someone clarify,does the
RAID 0+1 configuration require some diskspace to write
RAID 0+1 information..how do we calculate how much diskspace is
required.

thanks