I have a SYS-6016T-6RF+ system, and at the moment, we have two PCI adapters. A SAS Adapter and a SAN Fiber Channel Adapter.
Although, we've tried using different 'SAN FC Adapters', Red Hat 7 can detect only one card at a time.
This means that if I have connected both adapters (SAS + SAN FC) at the same time it will only detect the SAN FC adapter for example.
Under BIOS > Advance > PCIE configuration:
change Slot J2 PCIe Width to [Force x8/x8]