Hi, My raidcontroller (CCISS) supports SG_IO in recent kernel versions, but it does not work as a scsi device in sgpdd-survey because it does not show in sg_map. Hence, I need to set it up as a raw device to get sgpdd-survey to work. But why use raw devices when it is easier to use direct i/o. (no need to recompile kernel with raw support etc.) Is there a difference between direct i/o and raw devices ? If not, Is there a reason to sgpdd-survey is using raw devices rather than the direct flag to spg_dd ? /Jakob