sg_compare_and_write man page on Slackware
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COMPARE AND WRITE(8) SG3_UTILS COMPARE AND WRITE(8)
NAME
sg_compare_and_write - send the SCSI COMPARE AND WRITE command
SYNOPSIS
sg_compare_and_write [--dpo] [--fua] [--fua_nv] [--help] --in=IF
--lba=LBA [--num=NUM] [--timeout=TO] [--verbose] [--version] [--wrpro‐
tect=WP] [--xferlen=LEN] DEVICE
DESCRIPTION
Send the SCSI COMPARE AND WRITE command to DEVICE. This command
receives a data buffer which contains a verify instance and a write
instance each containing num blocks, the DEVICE will read num blocks
starting at logical block address LBA, compare the data read from the
specified blocks to the verify instance and if they match, write the
write instance to the DEVICE at the same logical block address LBA.
All of the above operations shall be performed as an uninterrupted
series of actions.
The data buffer which contains the verify and write instances are
obtained from the input file IF, this file is expected to be 2*num
blocks long. If bs is not specified, then READ CAPACITY(10) is used to
determine the block size. If not specified, the transfer size will be
the 2*num blocks.
In case of a mismatch between the blocks read from DEVICE and the ver‐
ify instance in the data buffer, a check condition will be returned
with sense key set to miscompare.
This command is defined in SBC-3 whose most recent revision is 35d.
SBC-3 and other SCSI documents can be found at http://www.t10.org .
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.
-d, --dpo
Set the DPO bit in the COMPARE AND WRITE CDB
-f, --fua
Set the FUA bit in the COMPARE AND WRITE CDB
-F, --fua_nv
Set the FUA_NV bit in the COMPARE AND WRITE CDB. This bit was
removed in SBC-3 revision 35d and its position marked as
"reserved".
-h, --help
output the usage message then exit.
-i, --in=IF
read data (binary) from file named IF and use it as the data out
buffer for the SCSI COMPARE AND WRITE command. The IF shall be
at 2*NUM blocks.
-l, --lba=LBA
where LBA is the logical block address to start the COMPARE AND
WRITE command. Assumed to be in decimal unless prefixed with
'0x' or has a trailing 'h'.
-n, --num=NUM
where NUM is the number of blocks, starting at LBA, to read and
compare with the verify instance. And given a match, the NUM of
blocks to write starting LBA. The default value for NUM is 1.
-t, --timeout=TO
where TO is the command timeout value in seconds. The default
value is 60 seconds. If NUM is large (or zero) a WRITE SAME com‐
mand may require considerably more time than 60 seconds to com‐
plete.
-v, --verbose
increase the degree of verbosity (debug messages).
-V, --version
output version string then exit.
-w, --wrprotect=WP
set the WRPROTECT field in the cdb to WP. The default value is 0
which implies no protection information is sent (along with the
user data) by this utility.
-x, --xferlen=LEN
where LEN is the data out buffer length. Defaults to 2*NUM
blocks.
NOTES
Various numeric arguments (e.g. LBA) may include multiplicative suf‐
fixes or be given in hexadecimal. See the "NUMERIC ARGUMENTS" section
in the sg3_utils(8) man page.
EXIT STATUS
The exit status of sg_compare_and_write is 0 when it is successful.
Otherwise see the sg3_utils(8) man page.
AUTHORS
Written by Shahar Salzman.
REPORTING BUGS
Report bugs to shahar.salzman@kaminario.com
COPYRIGHT
Copyright © 2012-2013 Kaminario Technologies LTD
Redistribution and use in source and binary forms, with or without mod‐
ification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the <organization> nor the names of its contribu‐
tors may be used to endorse or promote products derived from this soft‐
ware without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTIC‐
ULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Kaminario Technologies
LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSI‐
NESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
SEE ALSO
sg_xcopy, sg_receive_copy_results(sg3_utils)
sg3_utils-1.36 May 2013 COMPARE AND WRITE(8)
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