In a computer system having redundant SCSI controllers cards, a SCSI controller interface for receiving multiple interchangeable SCSI controller cards is configured so that the data bus paths between each of the SCSI controller slots and the controller circuitry do not cross. The cooled components, such as turbine airfoils and combustors, have a base metal structural member, including a metal sheet or blank, with a featured surface. The present invention also discloses a user data channel transmission method and device, and a user physical resource determining device.