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A utility program called scsidev adds device names to the /dev/scsi directory that reflect the SCSI address of each device. The first 2 letters of the name are the upper level SCSI driver name (i.e. either sd, sr, st or sg). The number following the "h" is the host number while the number following the "-" is meant for host identification purposes. For PCI adapters this seems to be always 0 while for ISA adapters it is their IO address. [Perhaps this field could be made more informative or dropped.] The numbers following the "c", "i" and "l" are channel (bus), target id and lun values respectively. Raw disks are shown without a trailing partition number while partitions contained within them are shown with the partition number following a "p".
The scsidev would typically be run as part of the boot up sequence. It may also be useful to run it after the SCSI configuration has changed (e.g. adding or removing lower level driver modules, or the use of the add/remove-single-device command). After scsidev has been run on my system which contains 2 disks, a cd reader and writer plus a scanner, then the following names were added in the /dev/scsi directory:
The scsidev package also includes the ability to introduce names like /dev/scsi/scanner by manipulating the /etc/scsi.alias configuration file. The package also includes the useful rescan-scsi-bus.sh utility. For further information about scsidev see W6. On my system, both devfs and scsidev co-exist happily.