I have a X3400 with 8 x (43w7598 250GB SATA 3GB/S HDD) set in the frontal bay and connected to ServeRaid 8K controller.
The raid array works well but, even if I set the controller PHY to 3.0 (rather then Auto or 1.5), all the disks negotiate 1.5Gb/s with the controller.
This sounds really weird to me because the disk are WD Caviar Black Sata2 disks (bought from IBM). The firmware is the latest available from IBM (accordingly to the IBM ServeRaid matrix). Any tip?