NAME

       scsi_logging_level - access Linux SCSI logging level information

SYNOPSIS

       scsi_logging_level [--all=LEV] [--create] [--error=LEV] [--get] [--help] [--highlevel=LEV]
       [--hlcomplete=LEV]  [--hlqueue=LEV]   [--ioctl=LEV]   [--llcomplete=LEV]   [--llqueue=LEV]
       [--lowlevel=LEV]  [--midlevel=LEV] [--mlcomplete=LEV] [--mlqueue=LEV] [--scan=LEV] [--set]
       [--timeout=LEV] [--version]

DESCRIPTION

       This bash shell script accesses the Linux SCSI subsystem logging level. The current values
       can  be  shown  (e.g. with --get) or changed (e.g. with --set). Superuser permissions will
       typically be required to set the logging level.

       One of these options: --create, --get or --set is required. Only one of them can be given.

OPTIONS

       Arguments to long options are mandatory for short options as well.

       -a, --all=LEV
              LEV is used for all SCSI_LOG fields.

       -c, --create
              Options are parsed and placed in internal fields that are displayed but no  logging
              levels are changed within the Linux kernel.

       -E, --error=LEV
              LEV is placed in the SCSI_LOG_ERROR field.

       -g, --get
              Fetches the current SCSI logging levels from the Linux kernel and displays them.

       -h, --help
              print out the usage message then exit.

       -H, --highlevel=LEV
              LEV is placed in the SCSI_LOG_HLQUEUE and SCSI_LOG_HLCOMPLETE fields.

       --hlcomplete=LEV
              LEV is placed in the SCSI_LOG_HLCOMPLETE field.

       --hlqueue=LEV
              LEV is placed in the SCSI_LOG_HLQUEUE field.

       -I, --ioctl=LEV
              LEV is placed in the SCSI_LOG_IOCTL field.

       --llcomplete=LEV
              LEV is placed in the SCSI_LOG_LLCOMPLETE field.

       --llqueue=LEV
              LEV is placed in the SCSI_LOG_LLQUEUE field.

       -L, --lowlevel=LEV
              LEV is placed in the SCSI_LOG_LLQUEUE and SCSI_LOG_LLCOMPLETE fields.

       -M, --midlevel=LEV
              LEV is placed in the SCSI_LOG_MLQUEUE and SCSI_LOG_MLCOMPLETE fields.

       --mlcomplete=LEV
              LEV is placed in the SCSI_LOG_MLCOMPLETE field.

       --mlqueue=LEV
              LEV is placed in the SCSI_LOG_MLQUEUE field.

       -S, --scan=LEV
              LEV is placed in the SCSI_LOG_SCAN field.

       -s, --set
              Uses  the  fields specified in this command's options and attempts to apply them to
              the Linux SCSI subsystem logging levels. Typically superuser  permissions  will  be
              required to do this.

       -T, --timeout=LEV
              LEV is placed in the SCSI_LOG_TIMEOUT field.

       -v, --version
              Outputs the version information and then exits.

NOTES

       The --get and --set options access the /proc/sys/dev/scsi/logging_level pseudo file.

EXIT STATUS

       The exit status of this script is 0 when it is successful. Any other exit status indicates
       that an error has occurred.

EXAMPLES

       The following will set SCSI_LOG_ERROR to level 5 in the Linux  kernel.  It  requires  root
       permissions:

         scsi_logging_level -s -E 5

       So  as  to  not  interfere with other SCSI subsystem upper level drivers (ULDs) which most
       likely will be active at the same time, the Linux  sg  driver  uses  SCSI_LOG_TIMEOUT  for
       logging purposes. To see full debugging and trace from the sg driver use:

         scsi_logging_level -s -T 7

       The  output  from  the  sg  driver  caused  by  this  will  go  to  the  system logs (e.g.
       /var/log/syslog). To reduce the amount of output use a number lower than 7. Using  0  will
       turn off the tracing and debug.

AUTHORS

       Written by IBM. Small alterations by Douglas Gilbert.

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright © IBM Corp. 2006
       This  software  is distributed under the GPL version 2. There is NO warranty; not even for
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

       The software was obtained from an  IBM  package  called  s390-tools-1.6.2  found  on  that
       company's  "developerworks"  site. The most recent version of that package at this time is
       1.8.3 .