Add additional storage

dear,

I have a hypervisor server that is in production with 2 300G disks in RAID1, now, I bought 2 more HD than 1 Tb to be new datastore. When you run the fdisk -l command on the hypervisor server checked that the two disks are recognized, how can I add them to the hypervisor so that they are two independent storage arrays and which are recognized by the RHEV-M server?

grateful.