Based on that info I assume the board having a "8x SAS Ports via LSI 1068E Controller". We received the server with 3 drives + 1 spare as hw RAID-5 preinstalled. During bootup I see that the drives are initialised and everything seems ok.
The issue I am facing is that when trying to install CentOS no hard drives are recognised.
One other thing to check, which is rare but I've seen before with your symptoms, is a controller that's not listed in the driver's PCI ID list. The chip onboard is a 1068e but if Supermicro used a nonstandard PCI ID, the driver wouldn't recognize it.