SG3UTILS SGVPD(1M)
NAME
sgvpd - fetches Vital Product Data (VPD) pages using a SCSI
INQUIRY command
SYNOPSIS
sgvpd [--enumerate] [--help] [--hex] [--ident] [--long]
[--maxlen=LEN] [--page=PG] [--quiet] [--raw] [--verbose]
[--version] DEVICE
DESCRIPTION
This utility fetches a Vital Product Data page and decodes
it or outputs it in ASCI hexadecimal or binary. VPD pages
are fetched with a SCSI INQUIRY command.
Probably the most important page is the Device Identifica-
tion VPD page (page number: 0x83). Since SPC-3, support for
this page has been flagged as mandatory. This page can be
fetched by using the --ident option.
When no options are given, other than a DEVICE, then the
"Supported VPD pages" (0x0) VPD page is fetched and decoded.
OPTIONS
Arguments to long options are mandatory for short options as
well. The options are arranged in alphabetical order based
on the long option name.
-e, --enumerate
list the names of the known VPD pages, first the stan-
dard pages, then the vendor specific pages. Each group
is sorted in abbreviation order. The DEVICE and other
options are ignored and this utility exits afte listing
the VPD page names.
-h, --help
outputs the usage message summarizing command line
options then exits. Ignores DEVICE if given.
-H, --hex
outputs the requested VPD page in ASCI hexadecimal.
Can be used multiple times, see section on the ATA
information vpd page.
-i, --ident
decode the device identification (0x83) VPD page. When
used once this option has the same effect as
'--page=di'. When use twice then the short form of the
device identification VPD page's logical unit designa-
tor is decoded. In the latter case this option has the
same effect as '--quiet --page=dilu'.
-l, --long
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when decoding some VPD pages, give a little more out-
put. For example the ATA Information VPD page only
shows the signature (in hex) and the IDENTIFY (PACKET)
DEVICE (in hex) when this option is given.
-m, --maxlen=LEN
where LEN is the (maximum) response length in bytes. It
is placed in the cdb's "allocation length" field. If
not given (or LEN is zero) then 252 is used (apart from
the ATA Information VPD page which defaults to 572)
and, if the response indicates this value is insuffi-
cient, another INQUIRY command is sent with a larger
value in the cdb's "allocation length" field. If this
option is given and LEN is greater than 0 then only one
INQUIRY command is sent. Since many simple devices
implement the INQUIRY command badly (and do not support
VPD pages) then the safest value to use for LEN is 36.
See the sginq man page for the more information.
-p, --page=PG
where PG is the VPD page to be decoded or output. The
PG argument can either be an abbreviation, a number or
a pair or numbers separated by a comma. The VPD page
abbreviations can be seen by using the --enumerate
option. If a number is given it is assumed to be
decimal unless it has a hexadecimal indicator which is
either a leading '0x' or a trailing 'h'. If one number
is given then it is assumed to be a VPD page number. If
two numbers are given the second number indicates which
vendor specific VPD page to decode when several pages
share the same VPD page number. If this option is not
given (nor '-i', '-l' nor '-V') then the "Supported VPD
pages" (0x0) VPD page is fetched and decoded.
-q, --quiet
suppress the amount of decoding output.
-r, --raw
output requested VPD page 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 then exit.
ATA INFORMATION VPD PAGE
This VPD page (0x89 or 'ai') is defined by the SCSI to ATA
Translation standard. It contains information about the SAT
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layer, the "signature" of the ATA device and the response to
the ATA IDENTIFY (PACKET) DEVICE command. The latter part
has 512 bytes of identity, capability and settings data
which the hdparm utility is capable of decoding (so this
utility doesn't decode it).
To unclutter the output for this page, the signature and the
IDENTIFY (PACKET) DEVICE response are not output unless the
--long option (or --hex or --raw) are given. When the --long
option is given the IDENTIFY (PACKET) DEVICE response is
output as 256 (16 bit) words as is the fashion for ATA dev-
ices. To see that response as a string of bytes use the
'-H' option. To format the output suitable for hdparm to
decode use either the '-H' or '-rr' option. For example if
'dev/sdb' is a SATA disk behind a SAT layer then this com-
mand: 'sgvpd -p ai -H /dev/sdb hdparm --Istdin' should
decode the ATA IDENTIFY (PACKET) DEVICE response.
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
"sginq /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").
EXIT STATUS
The exit status of sgvpd is 0 when it is successful. Other-
wise see the sg3utils(1M) man page.
AUTHOR
Written by Doug Gilbert
REPORTING BUGS
Report bugs to .
COPYRIGHT
Copyright O 2006-2008 Douglas Gilbert
This software is distributed under a FreeBSD license. There
is NO warranty; not even for MERCHANTABILITY or FITNES FOR
A PARTICULAR PURPOSE.
SEE ALSO
sginq(sg3utils), sdparm(sdparm), hdparm(hdparm)
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
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ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWsg3utilsu
Interface Stability Committed
NOTES
Source for sg3utils is available on http:/opensolaris.org.
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