scsi_logging_level - access Linux SCSI logging level information

       Written by IBM. Small alterations by Douglas Gilbert.

       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 .

sg3_utils-1.48                                    December 2022                            SCSI_LOGGING_LEVEL(8)

       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.

       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.

       To turn on maximum SCSI subsystem logging use:

         scsi_logging_level -s -a 7

       That is probably best done on a system that does not use a SCSI command device  to  hold  the  root  file
       system,  or  the  file  system  that  holds the system log. Note that SATA disks and USB attached storage
       nearly always use the SCSI subsystem.

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

       scsi_logging_level - access Linux SCSI logging level information

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

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

       -a, --all=LEVLEV 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=LEVLEV 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=LEVLEV is placed in the SCSI_LOG_HLQUEUE and SCSI_LOG_HLCOMPLETE fields.

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

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

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

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

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

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

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

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

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

       -S, --scan=LEVLEV 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=LEVLEV is placed in the SCSI_LOG_TIMEOUT field.

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

       Report bugs to <dgilbert at interlog dot com>.

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]