It continually will only see the individual disks and not the virtual disk created in the raid utilities.
It means that is not a real hardware RAID controller but a soft-RAID controller.
ESX/ESXi works only with hardware RAID controller.
In your case you can create 3 individual datastores.
Andre
Andrew | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro