Ubuntu Manpage: sg_opcodes - report supported SCSI commands or task management functions

Provided by: sg3-utils_1.44-1ubuntu2_amd64

NAME

       sg_opcodes - report supported SCSI commands or task management functions

SYNOPSIS

       sg_opcodes  [--alpha]  [--compact]  [--enumerate] [--help] [--hex] [--mask] [--mlu] [--no-
       inquiry] [--opcode=OP] [--pdt=DT] [--raw] [--rctd] [--repd] [--sa=SA] [--tmf] [--unsorted]
       [--verbose] [--version] DEVICE

       sg_opcodes  [-a] [-c] [-e] [-H] [-m] [-M] [-n] [-o=OP] [-p=DT] [-q] [-R] [-s=SA] [-t] [-u]
       [-v] [-V] [-?]  DEVICE

DESCRIPTION

       This utility sends a SCSI REPORT SUPPORTED OPERATION CODES  or  a  REPORT  SUPPORTED  TASK
       MANAGEMENT  FUNCTIONS  command  to  the  DEVICE and then outputs the response. The default
       action is to report supported operation codes. In  this  mode  it  will  either  list  all
       supported  commands  or  give detailed information on a specific command identified by the
       --opcode=OP option (perhaps with additional information from the --sa=SA option).

       The name of a SCSI command depends on its peripheral device type (e.g. a disk). The REPORT
       SUPPORTED  OPERATION CODES and REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS commands are not
       supported in the MMC command set for CD and DVD devices. This utility does an  INQUIRY  to
       obtain the peripheral device type and prints out the vendor, product and revision strings.

       A  similar  facility  to  query supported operation codes previously was available via the
       CmdDt bit in the SCSI INQUIRY command (see sg_inq(8)).  However  that  facility  was  made
       obsolete  and  replaced by the REPORT SUPPORTED OPERATION CODES command in SPC-3 (revision
       4) during February 2002.

       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.

-a, --alpha
when all supported commands are being listed there is no requirement for the device
server (i.e. the DEVICE) to sort the list of commands. When this option is given
the list of supported commands is sorted by name (alphabetically). When this option
and the --unsorted option are both _not_ given then the list of supported commands
is sorted numerically (first by operation code and then by service action).

-c, --compact
some command names, especially those associated with some service actions, are
getting longer. This may cause line wrap in the one line per command mode on some
terminals. When this option is given the opcode and service action fields are
combined into a single field with the service action, prefixed by a comma shown
directly after the opcode. If there is no service action associated with the
command, then the comma and the service action are not shown after the opcode. The
CDB size field is not shown when this option is given.

-e, --enumerate
this option prints the name of the SCSI command based on the given opcode,
peripheral device type and optionally the service action. If given, DEVICE is
ignored. The opcode, peripheral device type and service action default to zero if
not given. Thus if this option is the only option given then "Test Unit ready" is
output since its opcode is 0, it has no service action and it is common to all
peripheral device types since it is defined in the SCSI Primary Commands (SPC)
standard(s).

-h, --help
outputs the usage message summarizing command line options then exits. Ignores
DEVICE if given.

-H, --hex
outputs the response in ASCII hexadecimal to stdout.

-m, --mask
additionally prints out the cdb mask in hex. So a 12 byte cdb will have a 12 byte
hexadecimal mask. If the hexadecimal is expanded (mentally) to binary then a "1"
means the corresponding position in the cdb may be set. And "0" means the
corresponding position in the cdb must not be set. For "0" mask positions that a
user tries to set in a cdb, the device may either ignore it or report an error,
typically with a sense key of "illegal request".

-M, --mlu
additionally prints out an indication (0 or 1) whether the command effects all
logical units in the containing target. MLU (Multiple Logical Units) is a bit in
the REPORT SUPPORTED OPERATION CODES response introduced by proposal 18-045r1 (and
possibly in spc5r20). Without the option, the default output format which lists all
opcodes, does not include a MLU indication.

-n, --no-inquiry
Prior to calling a SCSI REPORT SUPPORTED OPERATION CODES or a REPORT SUPPORTED TASK
MANAGEMENT FUNCTIONS command, a SCSI INQUIRY command is performed. The reason is to
determine the peripheral device type (pdt) of the DEVICE as this is helpful in
translating operation codes to the command names. By default this utility prints a
summary of INQUIRY command response on stdout. If this option (or the --raw option)
is given then that summary is not printed on stdout.

-O, --old
Switch to older style options. Please use as first option.

-o, --opcode=OP
the DEVICE will be queried for the given operation code (i.e. the OP value) which
is the first byte of a SCSI command. OP is decimal unless prefixed by "0x" or it
has a trailing "h". OP should be in the range 0 to 255 (0xff) inclusive. When this
option is not given then all available SCSI commands supported by the DEVICE are
listed.

-p, --pdt=DT
where DT is the peripheral device type. This is used together with the --enumerate
to differentiate when a command opcode (and perhaps service action) is shared by
multiple device types.
This option may also be used with the --no-inquiry option to suppress this utility
doing an INQUIRY command since the main reason for doing that is to find the
peripheral device type of the DEVICE.

-r, --raw
output the response in binary to stdout. Error messages and warnings, if any, are
sent to stderr.

-R, --rctd
set report command timeout descriptor (RCTD) bit in the cdb. The response may or
may not contain command timeout descriptors. If available they are output. If
supported there are two values: a nominal command timeout and a recommended command
timeout. Both have units of seconds. A value of zero means that no timeout is
indicated and this is shown in the corresponding decoded output as "-".

-q, --repd
set read extended parameter data (REPD) bit in the report task management functions
cdb. 16 bytes rather than the default 4 bytes expected in the response. This was
added in SPC-4 (revision 26).

-s, --sa=SA
the DEVICE will be queried for a command with the given service action (i.e. the SA
value). Used in conjunction with the --opcode=OP option. If this option is not
given, --opcode=OP is given and the command in question does have a service action
then a value of 0 will be assumed. SA is decimal and expected to be in the range 0
to 65535 (0xffff) inclusive.

-t, --tmf
list supported task management functions. This is done with the SCSI REPORT
SUPPORTED TASK MANAGEMENT FUNCTIONS command. When this option is chosen the
--alpha, --opcode=OP, --rctd, --sa=SA and --unsorted options are ignored.

-u, --unsorted
when all supported commands are being listed there is no requirement for the device
server (i.e. the DEVICE) to sort the list of commands. When this option is given
the list of supported commands is in the order given by the DEVICE. When this
option is not given the supported commands are sorted numerically (first by
operation code and then by service action).

-v, --verbose
increase level of verbosity. Can be used multiple times.

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

NOTES

       As of SPC-5 revision 8 the recognized task management functions are: abort set, abort task
       set,  clear ACA, clear task set, logical unit reset, query task, query asynchronous event,
       query task set, and I_T nexus reset.  In SPC-4 revision 26 target reset  and  wakeup  task
       management functions were made obsolete.

       In  the  2.4 series of Linux kernels the DEVICE must be a SCSI generic (sg) device. In the
       2.6 series block devices (e.g. SCSI disks and DVD  drives)  can  also  be  specified.  For
       example "sg_opcodes /dev/sda" will work in the 2.6 series kernels.

EXIT STATUS

       The  exit  status of sg_opcodes is 0 when it is successful. Otherwise 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 .
Since then this utility defaults to the newer command line options which can be overridden
by using --old (or -O) as the first option. See the ENVIRONMENT VARIABLES section for
another way to force the use of these older command line options.

-a sort command alphabetically. Equivalent to --alpha in main description.

-c see the --compact option above.

-e see the --enumerate option above.

-H see the --hex option above.

-m see the --mask option above.

-n don't print a summary of the SCSI INQUIRY response on stdout.

-N, --new
Switch to the newer style options.

-o=OP the DEVICE will be queried for the given operation code (i.e. OP) which is the
first byte of a SCSI command. OP is hexadecimal and expected to be in the range 0
to ff inclusive. When this option is not given then all available SCSI commands
supported by the DEVICE are listed.

-p=DT see the --pdt=DT option above.

-q set the read extended parameter data (REPD) bit in report TMF cdb. Equivalent to
--repd in main description.

-R set the report command timeout descriptor (RCTD) bit in cdb. Equivalent to --rctd
in main description.

-s=SA the DEVICE will be queried for a command with the given service action (i.e. SA).
Used in conjunction with the -o=OP option. If this option is not given, -o=OP is
given and the command in question does have a service action then a value of 0 will
be assumed. SA is hexadecimal and expected to be in the range 0 to ffff inclusive.

-t list supported task management functions. Equivalent to --tmf in the main
description.

-u output all supported commands in the order given by DEVICE. Equivalent to
--unsorted in main description.

-v increase level of verbosity. Can be used multiple times.

-V print out version string then exit.

-? output usage message. Ignore all other parameters.

EXAMPLES

       The  examples  in  this  page  use  Linux device names. For suitable device names in other
       supported Operating Systems see the sg3_utils(8) man page.

       To see the information about a specific command give its operation  code  to  the  '--op='
       option. A command line invocation is shown first followed by a typical response:

          # sg_opcodes --op=93h /dev/sdb

         Opcode=0x93
         Command_name: Write same(16)
         Command supported [conforming to SCSI standard]
         Usage data: 93 e2 00 00 00 00 ff ff ff ff 00 00 ff ff 00 00

       The next example shows the supported task management functions:

          # sg_opcodes --tmf -n /dev/sdb

       Task Management Functions supported by device:
           Abort task
           Abort task set
           Clear ACA
           Clear task set
           Logical unit reset
           Query task

       Enumerate  can  be  used  to  look  up a SCSI command name in the absence of a device that
       supports that command. The opcode and service action (if required) should be supplied:

          # sg_opcodes --enumerate --op=0x9b,0xa

         SCSI command:
           Read buffer(16), read data from echo buffer

ENVIRONMENT VARIABLES

       Since sg3_utils version 1.23 the environment variable  SG3_UTILS_OLD_OPTS  can  be  given.
       When  it  is  present  this  utility  will  expect  the older command line options. So the
       presence of this environment variable is equivalent to using --old (or -O)  as  the  first
       command line option.

AUTHOR

       Written by Douglas Gilbert

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright © 2004-2018 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.