I'm currently learning how to manage the storage of a HP proliant dl 180 g5. It has a Smart Array P400 RAID controller which works fine. So I've actually the problem, that I can't see disks which are not in RAID context. HP's Array configuration utility can see all disk, but these not raided disks are not shown to the OS.
The P400 is a array-management card, all disks have to be in one array or another in order to be visible to the BIOS, you can add them all to one array then create individual R0 logical disks if you want but they probably won't map directly to physical disks unless you spend a lot of time tweaking things. What is it you're actually trying to achieve?