What I have some success with (and very limited sample) are the commands of the form:
# echo "scsi add-single-device <h> <b> <t> <l>" > /proc/scsi/scsi
See Section 8.3 (proc interface) of the SCSI HowTO doc for details and more information ..... (http://tldp.org/HOWTO/SCSI-2.4-HOWTO/mlproc.html)
It works for SATA disk (which use the SCSI subsystem) in the few cases I've had to deal with ...
YMMV ...
Rich