sg_sat_read_gplog man page on DragonFly
[printable version]
SG_SAT_READ_GPLOG(8) SG3_UTILS SG_SAT_READ_GPLOG(8)
NAME
sg_sat_read_gplog - use ATA READ LOG EXT command via a SCSI to ATA
Translation (SAT) layer
SYNOPSIS
sg_sat_read_gplog [--ck_cond] [--count=CO] [--dma] [--help] [--hex]
[--len={16|12}] [--log=LA] [--page=PN] [--readonly] [--verbose] [--ver‐
sion] DEVICE
DESCRIPTION
This utility sends an ATA READ LOG EXT or an ATA READ LOG DMA EXT com‐
mand to the DEVICE. This command is used to read the general purpose
log of (S)ATA disks (not ATAPI devices such as DVD driver). Rather than
send the READ LOG (DMA) EXT command directly to the device it is sent
via a SCSI transport which is assumed to contain a SCSI to ATA Transla‐
tion (SAT) Layer (SATL). The SATL may be in an operating system driver,
in host bus adapter (HBA) firmware or in some external enclosure.
This utility does not currently attempt to decode the response from the
ATA disk, rather it outputs the response in ASCII hexadecimal grouped
in 16 bit words. Following ATA conventions those words are decoded lit‐
tle endian (note that SCSI commands use a big endian representation).
In the future this utility may attempt to decode some log pages, per‐
haps using the --decode option.
The SAT-2 standard (SAT ANSI INCITS 465-2010, prior draft: sat2r09.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.
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 irre‐
spective of whether the ATA command succeeded or failed. When
clear the SATL should only yield a sense buffer containing a ATA
Result descriptor if the ATA command failed.
-c, --count=CO
the number CO is placed in the "count" field in the ATA READ LOG
EXT command. This specified the number of 512-byte blocks of
data to be read from the specified log.
-d, --dma
use the ATA READ LOG DMA EXT command instead of ATA READ LOG EXT
command. Some devices require this to return valid log data.
-h, --help
outputs the usage message summarizing command line options then
exits. Ignores DEVICE if given.
-H, --hex
when given once, the response is output in ASCII hexadecimal
bytes. When given twice, then the response is grouped into 16
bit words using ATA conventions (i.e. little endian); this is
the default output (i.e. when this option is not given). When
given thrice (i.e. '-HHH') the output is in hex, grouped in 16
bit words (without a leading offset and trailing ASCII on each
line), in a format that is acceptable for 'hdparm --Istdin' to
process.
-L, --log=LA
the number LA is known as the "log address" in the ATA standards
and is placed in bits 7:0 of the "lba" field of the ATA READ LOG
(DMA) EXT command. This specifies the log to be returned (See
ATA-ACS for a detailed list of available log addresses). The
default value placed in the "lba field is 0, returning the
directory of available logs. The maximum value allowed for LOG
is 0xff.
-p, --page=PN
the number PN is the page number (within the log address) and is
placed in bits 32:16 of the "lba" field of the ATA READ LOG
(DMA) EXT command. The default value placed in the "lba" field
is 0. The maximum value allowed for LOG is 0xffff.
-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.
-r, --readonly
causes the DEVICE to be opened with the read-only flag (O_RDONLY
in Unix). The default action is to open DEVICE with the
read-write flag (O_RDWR in Unix). In some cases sending power
management commands to ATA disks are defeated by OS actions on
the close() if the DEVICE was opened with the read-write flag
(e.g. the OS might think it needs to flush something to disk).
-v, --verbose
increases the level or verbosity.
-V, --version
print out version string
NOTES
Prior to Linux kernel 2.6.29 USB mass storage limited sense data to 18
bytes which made the --ck_cond option yield strange (truncated)
results.
EXIT STATUS
The exit status of sg_sat_read_gplog is 0 when it is successful. Other‐
wise see the sg3_utils(8) man page.
AUTHOR
Written by Hannes Reinecke and Douglas Gilbert
REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>.
COPYRIGHT
Copyright © 2014-2015 Hannes Reinecke, SUSE Linux GmbH
This software is distributed under a FreeBSD license. There is NO war‐
ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
POSE.
SEE ALSO
sg_sat_identify(sg3_utils), sg_inq(sg3_utils), sdparm(sdparm),
hdparm(hdparm)
sg3_utils-1.41 April 2015 SG_SAT_READ_GPLOG(8)
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