I would imagine (but don't quote me on this) that the SCSI LUN will map to the sd*. Example:
SCSI LUN 1 == sda
SCSI LUN 4 == sdb
SCSI LUN 9 == sdc
I'd break out the google-monkey for confirmation, but I believe this is how it's done. The SCSI LUN is the Logical Unique Number assigned to each drive, usually with a jumper. Number 7 tends to be the physical card/controller.