Provided by: sg3-utils_1.33-1_amd64 bug


       sg_scan  -  does  a  scan  of  sg devices (or given SCSI/ATAPI/ATA devices) and prints the


       sg_scan [-a] [-i] [-n] [-w] [-x] [DEVICE]*


       If no DEVICE names are given, sg_scan does a scan of the sg devices and outputs a line  of
       information  for  each  sg device that is currently bound to a SCSI device. If one or more
       DEVICEs are given only those  devices  are  scanned.   Each  device  is  opened  with  the
       O_NONBLOCK  flag so that the scan will not "hang" on any device that another process holds
       an O_EXCL lock on.

       Any given DEVICE name is expected to comply with (to some extent) the Storage Architecture
       Model  (SAM  see  Any device names associated with the Linux SCSI subsystem
       (e.g. /dev/sda and /dev/st0m) are suitable. Devices names associated  with  ATAPI  devices
       (e.g. most CD/DVD drives and ATAPI tape drives) are also suitable.  If the device does not
       fall into the above categories then an ATA IDENTIFY command is tried.


       -a     do alphabetical scan (i.e. sga, sgb, sgc).  Note  that  sg  device  nodes  with  an
              alphabetical index have been deprecated since the linux kernel 2.2 series.

       -i     do  a SCSI INQUIRY, output results in a second (indented) line. If the device is an
              ATA disk then output information from an ATA IDENTIFY command

       -n     do numeric scan (i.e. sg0, sg1...) [default]

       -w     use a read/write flag when opening sg device (default is read-only)

       -x     extra information output about queuing


       This utility was written at a time when hotplugging of SCSI devices was not  supported  in
       Linux.  It  used  a  simple  algorithm  to  scan  sg  device nodes in ascending numeric or
       alphabetical order, stopping after there were 4 consecutive errors.

       In the linux kernel 2.6 series, this utility uses sysfs to find which sg device nodes  are
       active  and  only  checks  those.  Hence there can be large "holes" in the numbering of sg
       device nodes (e.g. after an adapter has been removed) and still all active sg device nodes
       will  be  listed.  This  utility  assumes  that sg device nodes are named using the normal
       conventions and searches from /dev/sg0 to /dev/sg4095 inclusive.


       The exit status of sg_scan is 0 when it is successful. Otherwise see the sg3_utils(8)  man


       Written by D. Gilbert and F. Jansen


       Copyright © 1999-2006 Douglas Gilbert
       This  software  is distributed under the GPL version 2. There is NO warranty; not even for