sg_sat_identify
(1m)
Name
sg_sat_identify - mand via a SCSI to ATA Translation (SAT) layer
Synopsis
sg_sat_identify [--ck_cond] [--extend] [--help] [--hex]
[--indent] [--len=16|12] [--packet] [--raw] [--verbose]
[--version] DEVICE
Description
SG3_UTILS SG_SAT_IDENTIFY(8)
NAME
sg_sat_identify - sends a ATA IDENTIFY (PACKET) DEVICE com-
mand via a SCSI to ATA Translation (SAT) layer
SYNOPSIS
sg_sat_identify [--ck_cond] [--extend] [--help] [--hex]
[--indent] [--len=16|12] [--packet] [--raw] [--verbose]
[--version] DEVICE
DESCRIPTION
This utility sends either an ATA IDENTIFY DEVICE command or
an ATA IDENTIFY PACKET DEVICE command to DEVICE and outputs
the response. The devices that respond to these commands are
ATA disks and ATAPI devices respectively. Rather than send
these commands directly to the device they are sent via a
SCSI transport which is assumed to contain a SCSI to ATA
Translation (SAT) Layer (SATL). The SATL may be in an oper-
ating system driver, in host bus adapter firmware or in some
external enclosure.
The SAT standard (SAT ANSI INCITS 431-2007, prior draft:
sat-r09.pdf at www.t10.org) defines two SCSI "ATA
PASS-THROUGH" commands: one using a 16 byte "cdb" and the
other with a 12 byte cdb. This utility defaults to using the
16 byte cdb variant. SAT-2 is also a standard: SAT-2 ANSI
INCITS 465-2010 and the draft prior to that is sat2r09.pdf .
The SAT-3 project has started and the most recent draft is
sat3r01.pdf .
OPTIONS
Arguments to long options are mandatory for short options as
well.
-c, --ck_cond
sets the CK_COND bit in the ATA PASS-THROUGH SCSI cdb.
The default setting is clear (i.e. 0). When set the
SATL should yield a sense buffer containing a ATA
Result descriptor irrespective of whether the command
succeeded or failed. When clear the SATL should only
yield a sense buffer containing a ATA Result descriptor
if the command failed.
-e, --extend
sets the EXTEND bit in the ATA PASS-THROUGH SCSI cdb.
The default setting is clear (i.e. 0). When set a 48
bit LBA command is sent to the device. This option has
no effect when --len=12.
-h, --help
outputs the usage message summarizing command line
options then exits. Ignores DEVICE if given.
sg3_utils-1.32 Last change: May 2011 1
SG3_UTILS SG_SAT_IDENTIFY(8)
-H, --hex
outputs the ATA IDENTIFY (PACKET) DEVICE response in
hex. The default action (i.e. without any '-H' options)
is to output the response in hex, grouped in 16 bit
words (i.e. the ATA standard's preference). When given
once, the response is output in ASCII hex bytes (i.e.
the SCSI standard's preference). When given twice (i.e.
'-HH') the output is in hex, grouped in 16 bit words,
the same as the default but without a header. When
given thrice (i.e. '-HHH') the output is in hex,
grouped in 16 bit words, in a format that is acceptable
for 'hdparm --Istdin' to process.
-i, --indent
outputs the World Wide Name (WWN) of the device. This
should be a NAA-5 64 bit number. It is output in hex
prefixed with "0x". If not available then
"0x0000000000000000" is output. The equivalent for a
SCSI disk (i.e. its logical unit name) can be found
with "sg_vpd -ii".
-l, --len=16 | 12
this is the length of the SCSI cdb used for the ATA
PASS-THROUGH commands. The argument can either be 16
or 12. The default is 16. The larger cdb size is needed
for 48 bit LBA addressing of ATA devices. On the other
hand some SCSI transports cannot convey SCSI commands
longer than 12 bytes.
-p, --packet
send an ATA IDENTIFY PACKET DEVICE command (via the
SATL). The default action is to send an ATA IDENTIFY
DEVICE command.
-r, --raw
output the ATA IDENTIFY (PACKET) DEVICE response in
binary. The output should be piped to a file or another
utility when this option is used. The binary is sent
to stdout, and errors are sent to stderr.
-v, --verbose
increases the level or verbosity.
-V, --version
print out version string
ATTRIBUTES
See attributes(5) for descriptions of the following
attributes:
sg3_utils-1.32 Last change: May 2011 2
SG3_UTILS SG_SAT_IDENTIFY(8)
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | system/storage/sg3_utils |
+---------------+--------------------------+
|Stability | Uncommitted |
+---------------+--------------------------+
NOTES
Since the response to the IDENTIFY (PACKET) DEVICE command
is very important for the correct use of an ATA(PI) device
(and is typically the first command sent), a SATL should
provide an ATA Information VPD page which contains the simi-
lar information.
The SCSI ATA PASS-THROUGH (12) command's opcode is 0xa1 and
it clashes with the MMC set's BLANK command used by cd/dvd
writers. So a SATL in front of an ATAPI device that uses MMC
(i.e. has peripheral device type 5) probably should treat
opcode 0xa1 as a BLANK command and send it through to the
cd/dvd drive. The ATA PASS-THROUGH (16) command's opcode
(0x85) does not clash with anything so it is a better
choice.
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.
disks and ATAPI DVDs) can also be specified. For example
"sg_inq /dev/sda" will work in the 2.6 series kernels. From
lk 2.6.6 other SCSI "char" device names may be used as well
(e.g. "/dev/st0m"). Prior to lk 2.6.29 USB mass storage lim-
ited sense data to 18 bytes which made the --ck_cond option
yield strange (truncated) results.
EXIT STATUS
The exit status of sg_sat_identify is 0 when it is success-
ful. Otherwise see the sg3_utils(8) man page.
AUTHOR
Written by Doug Gilbert
REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>.
COPYRIGHT
Copyright (C) 2006-2011 Douglas Gilbert
This software is distributed under a FreeBSD license. There
is NO warranty; not even for MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE.
SEE ALSO
sg_vpd(sg3_utils), sg_inq(sg3_utils), sdparm(sdparm),
hdparm(hdparm)
sg3_utils-1.32 Last change: May 2011 3
SG3_UTILS SG_SAT_IDENTIFY(8)
This software was built from source available at
https://java.net/projects/solaris-userland. The original
community source was downloaded from
http://sg.danny.cz/sg/p/sg3_utils-1.33.tgz
Further information about this software can be found on the
open source community website at
http://sg.danny.cz/sg/sg3_utils.html.
sg3_utils-1.32 Last change: May 2011 4