su

SU(4)                       Kernel Interfaces Manual                     SU(4)

NAME
     su — scsi user-level driver

SYNOPSIS
     pseudo-device su

DESCRIPTION
     The su driver provides support for a process to address arbitrary
     locations on the scsi bus.  Minor numbers are mapped 1:1 to
     bus:target:lun.  The lowest three bits being LUN and the next three bits
     being TARGET.  Remaining bits are the bus number.

     A scsi adapter must also be separately configured into the system before
     this driver makes sense.

KERNEL CONFIGURATION
     There are no configuration parameters for the su option.  It's either
     there or it's not.


IOCTLS
     The su driver has no ioctls of it's own but rather acts as a medium for
     the generic scsi(4) ioctls.  These are described in sys/scsiio.h.



FILES
     /dev/su[0-9]-[0-7]-[0-7]
                              su{x}-{y}-{z} is the su device for the device at
                              bus x, target y, lun z

DIAGNOSTICS
     All scsi(4) debug ioctls work on su devices.

SEE ALSO
     cd(4), scsi(4), sd(4), ssc(4), st(4), uk(4)

HISTORY
     The su driver appeared in 386BSD 0.1.

FreeBSD                         August 27, 1993                        FreeBSD