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sgdiag



SYNOPSIS

       sgdiag [-aenx]


DESCRIPTION

       Sgdiag  is  a program that uses the SCSI Generic interface
       to send specific SCSI commands to specified SCSI  devices.
       The  SCSI Generic interface requires that the kernel .con­
       fig file have CONFIG_CHR_DEV_SG set.

       A log file, named sgdiag.log is created  in  the  /var/log
       directory  which  logs the status of the functions and any
       errors.

       Several different functions can  be  performed  with  this
       utility.

       c = Compose Command to send
              This  function  allows the user to compose a custom
              SCSI command to send to one or  more  devices.   It
              prompts  the user for the command length, each com­
              mand byte, the write data length, each  write  data
              byte, and the receive data length.

       r = Reset SCSI bus
              This  function  will send a bus reset signal to the
              SCSI bus of the selected device.  This may be  use­
              ful to free up a hung device.

       i = Special Ser# Inquiries
              This  issues several special SCSI inquiry to obtain
              the serial number of the device.  Normally this  is
              not  needed, since the serial number of most modern
              devices is included in the standard inquiry.

       f = Format SCSI disk
              This function issues a low-level SCSI  format  com­
              mand  to  the selected device.  This will remap any
              media defects as it formats the disk.   Of  course,
              it will erase any data on the selected disk.

       w = Wipe SCSI disk
              This  function  issues a low-level SCSI format com­
              mand to the selected device.  This will NOT include
              the previous grown defect list.  This may be useful
              in testing to cause a disk  to  expose  some  media
              defects.   This is dangerous and should not be used
              on production systems.

       d = Send Diagnostic self-test
              This function issues a SCSI Send  Diagnostic  self-
              test  command  to  the selected device.  The device

       1 = Do bug 1 (sense_len = 18)
              The standard sg structure only defines 16 bytes  of
              sense  data,  whereas  18 bytes are needed to parse
              some illegal request  sense  keys.   This  function
              attempts to request 18 bytes of sense data from the
              standard sg structure, which should cause a 5/24/00
              sense error, but should not cause the driver or the
              utility to hang or stop working.

       2 = Do bug 2 (INQ hang)
              In versions of the old  adaptec  driver  that  were
              delivered  with RedHat 6.2, this function will hang
              the driver by requesting a receive buffer less than
              96 bytes.  Newer versions of the driver should han­
              dle this function without error (status = 0).

       3 = Do bug 3 (format w short timeout)
              A SCSI format command can take several  minutes  to
              complete.  If the SCSI timeout is set too short, it
              should cause several retries, followed  by  marking
              the  SCSI device offline.  The device should return
              to normal after a reboot.


OPTIONS

       Command line options are described below.

       -?     This option displays  a  summary  of  the  commands
              accepted by sgdiag

       -a     Automatically  send  command  for  all devices.  If
              this option is specified, a  default  illegal  SCSI
              LOG_SENSE command will be sent to each device.

       -e     Causes  any  file writes to be avoided, such as the
              log file.

       -n     Naming.  By default, the device names are displayed
              as numeric sequences (/dev/sg0).  This option shows
              the   device   names   as   alphabetic    sequences
              (/dev/sga).

       -x     Causes extra debug messages to be displayed.


SEE ALSO

       sgdefects(8) sgdskfl(8) sgmode(8)


WARNINGS


       sgdiag is distributed in the hope that it will be  useful,
       but WITHOUT ANY WARRANTY.


AUTHOR

       Andy Cress <arcress@users.sourceforge.net>

                     Version 1.4: 14 May 2002           SGDIAG(8)
  
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