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SG_SCAN(8)                                  SG3_UTILS                                  SG_SCAN(8)



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

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

DESCRIPTION
       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_NON-
       BLOCK  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  www.t10.org).  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.

OPTIONS
       -a     do alphabetical scan (i.e. sga, sgb, sgc). Note that sg device nodes with an alpha-
              betical 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

NOTES
       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 alpha-
       betical 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 con-
       ventions and searches from /dev/sg0 to /dev/sg4095 inclusive.

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

AUTHORS
       Written by D. Gilbert and F. Jansen

COPYRIGHT
       Copyright (C) 1999-2006 Douglas Gilbert
       This  software  is distributed under the GPL version 2. There is NO warranty; not even for
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



sg3_utils-1.23                            December 2006                                SG_SCAN(8)

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