NAME

       sg_turs - send one or more SCSI TEST UNIT READY commands

SYNOPSIS

       sg_turs [--help] [--number=NUM] [--progress] [--time] [--verbose] [--version] DEVICE

       sg_turs [-n=NUM] [-p]  [-t] [-v] [-V] DEVICE

DESCRIPTION

       This  utility  sends  one or more SCSI TEST UNIT READY commands to the DEVICE. This may be
       useful for timing the per command overhead.  Note that TEST UNIT READY has  no  associated
       data, just a 6 byte command and a returned SCSI status value.

       This  utility  supports two command line syntaxes, the preferred one is shown first in the
       synopsis and explained in this section. A later section on the  old  command  line  syntax
       outlines the second group of options.

OPTIONS

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

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

       -n, --number=NUM
              performs  TEST  UNIT  READY  NUM  times.  If not given defaults to 1.  These suffix
              multipliers are permitted: c C *1; w W *2; b B *512; k K KiB *1,024; KB *1,000; m M
              MiB *1,048,576; MB *1,000,000; g G GiB *1,073,741,824; and GB *1,000,000,000 . Also
              a suffix of the form "x<n>" multiplies the leading number by <n>.  Alternatively  a
              hex number may be given, prefixed by either '0x' or has a trailing 'h'.

       -O, --old
              switch to older style options.

       -p, --progress
              show progress indication (a percentage) if available. If --number=NUM is given, NUM
              is greater than 1 and an initial progress indication was detected then this utility
              waits  30 seconds before subsequent checks.  Exits when NUM is reached or there are
              no more progress indications.  Ignores --time option. See NOTES section below.

       -t, --time
              after completing the requested number of TEST  UNIT  READY  commands,  outputs  the
              total duration and the average number of commands executed per second.

       -v, --verbose
              increase level or verbosity.

       -V, --version
              print version string then exit.

NOTES

       The  progress  indication  is optionally part of the sense data. When a prior command that
       takes a long time to complete (and typically precludes other  media  access  commands)  is
       still  underway,  the  progress  indication  can  be used to determine how long before the
       device returns to its normal state.

       The SCSI FORMAT command for disks used with  the  IMMED  bit  set  is  an  example  of  an
       operation  that takes a significant amount of time and precludes other media access during
       that time. The IMMED bit set instructs  the  FORMAT  command  to  return  control  to  the
       application  client  once the format has commenced (see SBC-3). Several long duration SCSI
       commands associated with tape drives also use the progress indication (see SSC-3).

       Early standards suggested that the SCSI TEST UNIT READY command be used  for  polling  the
       progress  indication. More recent standards seem to suggest the SCSI REQUEST SENSE command
       should be used instead.

EXIT STATUS

       The exit status of sg_turs is 0 when it is successful (e.g. in the case  of  a  mechanical
       disk,  it is spun up and ready to accept commands). For this utility the other exit status
       of interest is 2 corresponding to the "not ready" sense key. For other exit status  values
       see the sg3_utils(8) man page.

OLDER COMMAND LINE OPTIONS

       The options in this section were the only ones available prior to sg3_utils version 1.23 .
       In sg3_utils version 1.23 and later these older options can be selected by either  setting
       the SG3_UTILS_OLD_OPTS environment variable or using '--old' (or '-O) as the first option.

       -n=NUM performs  TEST  UNIT  READY  NUM  times. If not given defaults to 1.  Equivalent to
              --number=NUM in the main description.

       -N     switch to the newer style options.

       -p     show progress indication (a percentage) if available.  Equivalent to --progress  in
              the main description.

       -t     after  completing  the  requested  number  of TEST UNIT READY commands, outputs the
              total duration and the average number of commands executed per second.   Equivalent
              to --time in the main description.

       -v     increase level of verbosity.

       -V     print out version string then exit.

AUTHORS

       Written by D. Gilbert

COPYRIGHT

       Copyright © 2000-2012 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.

SEE ALSO

       sg_inq, sg_request (sg3_utils)