Ubuntu Manpage: sg_sat_phy_event - use ATA READ LOG EXT via a SAT pass-through to fetch SATA phy event

Provided by: sg3-utils_1.36-1ubuntu1_amd64

NAME

       sg_sat_phy_event  -  use  ATA  READ LOG EXT via a SAT pass-through to fetch SATA phy event
       counters

SYNOPSIS

       sg_sat_phy_event [--ck_cond] [--extend] [--help] [--hex] [--ignore] [--len=16|12]  [--raw]
       [--reset] --verbose] [--version] DEVICE

DESCRIPTION

       This  utility sends an ATA READ LOG EXT with the log page ("address") set to 11h to DEVICE
       and outputs the response. Log page 11h is defined in the SATA 2.5  standard  and  contains
       phy  event  counters. Rather than send this command directly to the DEVICE, 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 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 .

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.

-H, --hex
outputs the ATA READ LOG EXT 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.

-i, --ignore
usually the phy counter identifier names are decoded. When this option is given,
the numeric value of the identifier is output, the vendor flag, the data length (in
bytes) and the corresponding value.

-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.

-r, --raw
output the ATA READ LOG EXT 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.

-R, --reset
reset the counters after the current values are returned, decoded and displayed.

-v, --verbose
increases the level or verbosity.

-V, --version
print out version string

NOTES

       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
       limited  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  successful.  Otherwise  see  the
       sg3_utils(8) man page.

AUTHOR

       Written by Douglas Gilbert

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright © 2006-2012 Douglas Gilbert
       This  software  is distributed under a FreeBSD license. There is NO warranty; not even for
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.