Linux load raid 5 with cage

I have a server that I am trying to load with Netmax Linux Redhat version 7.3. Trying to load on a system with raid cage using raid level 5, 2120s controller and 4 Seagate 73GB SCSI drives. The problem is that cannot see the drives in the cage. Does anyone know of drivers that can be loaded on the start of the load to see the cage. Have contacted Seagate no joy here. Have searched but have found nothing. There must be a way to do this.