sg_sat_set_features
(1m)
Name
sg_sat_set_features - sends a ATA SET FEATURES command via a
SCSI to ATA Translation (SAT) layer
Synopsis
sg_sat_set_features [--count=CO] [--ck_cond] [--feature=FEA]
[--help] [--len=16|12] [--lba=LBA] [--verbose] [--version]
DEVICE
Description
SG3_UTILS SG_SAT_SET_FEATURES(8)
NAME
sg_sat_set_features - sends a ATA SET FEATURES command via a
SCSI to ATA Translation (SAT) layer
SYNOPSIS
sg_sat_set_features [--count=CO] [--ck_cond] [--feature=FEA]
[--help] [--len=16|12] [--lba=LBA] [--verbose] [--version]
DEVICE
DESCRIPTION
This utility sends an ATA SET FEATURES command to the
DEVICE. This command is used to change settings of ATA
non-packet (i.e. disks) and packet devices (e.g. cd/dvd
drives). Rather than send the SET FEATURES command directly
to the device it is sent via a SCSI transport which is
assumed to contain a SCSI to ATA Translation (SAT) Layer
(SATL). The SATL may be in an operating 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 .
The features can be read using the sg_sat_identify utility
which uses either the ATA IDENTIFY DEVICE (for non-packet
devices) or the IDENTIFY PACKET DEVICE (for packet devices)
command.
OPTIONS
Arguments to long options are mandatory for short options as
well.
-c, --count=CO
the number CO is placed in the "count" field in the ATA
SET FEATURES command. Only some subcommands (a term
used for the value placed in the "feature" field)
require the count field to be set. The default value
placed in the "count" field is 0.
-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 ATA com-
mand succeeded or failed. When clear the SATL should
only yield a sense buffer containing a ATA Result
descriptor if the ATA command failed.
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SG3_UTILS SG_SAT_SET_FEATURES(8)
-f, --feature=FEA
the value FEA is placed in the "feature" field in the
ATA SET FEATURES command. The term "subcommand" is
sometimes used for this value. The default value placed
in the "feature" field is 0 which is reserved and hence
should not change anything. Two common examples are 2h
to enable the write cache and 82h to disable it.
-h, --help
outputs the usage message summarizing command line
options then exits. Ignores DEVICE if given.
-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. Some SCSI transports cannot
convey SCSI commands longer than 12 bytes.
-L, --lba=LBA
the number LBA is placed in the "lba" field in the ATA
SET FEATURES command. Only some subcommands (a term
used for the value placed in the "feature" field)
require the lba field to be set. This value is not a
"logical block address" as the acronym might imply.
The default value placed in the "lba" field is 0.
-v, --verbose
increases the level or verbosity.
-V, --version
print out version string
ATTRIBUTES
See attributes(5) for descriptions of the following
attributes:
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | system/storage/sg3_utils |
+---------------+--------------------------+
|Stability | Uncommitted |
+---------------+--------------------------+
NOTES
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
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SG3_UTILS SG_SAT_SET_FEATURES(8)
yield strange (truncated) results.
EXIT STATUS
The exit status of sg_sat_set_features is 0 when it is suc-
cessful. 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) 2007-2011 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_sat_identify(sg3_utils), sg_inq(sg3_utils),
sdparm(sdparm), hdparm(hdparm)
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.
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