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ioping(1) [debian man page]

IOPING(1)							   User Commands							 IOPING(1)

NAME
ioping - simple disk I/O latency monitoring tool SYNOPSYS
ioping [-LCDRq] [-c count] [-w deadline] [-p period] [-i interval] [-s size] [-S wsize] [-o offset] device|file|directory ioping -h | -v DESCRIPTION
This tool lets you monitor I/O latency in real time. OPTIONS
-c count Stop after count requests. -w deadline Stop after deadline time passed. -p period Print raw statistics for every period requests. -i interval Set time between requests to interval (1s). -s size Request size (4k). -S size Working set size (1m). -o offset Offset in input file. -L Use sequential operations rather than random. This also sets request size to 256k (as in -s 256k). -C Use cached I/O. -D Use direct I/O. -R Disk seek rate test (same as -q -i 0 -w 3 -S 64m). -q Suppress human-readable output. -h Display help message and exit. -v Display version and exit. Argument suffixes For options that expect time argument (-i and -w), default is seconds, unless you specify one of the following suffixes (case-insensitive): us, usec microseconds ms, msec milliseconds s, sec seconds m, min minutes h, hour hours For options that expect "size" argument (-s, -S and -o), default is bytes, unless you specify one of the following suffixes (case-insensi- tive): s disk sectors (a sector is always 512). k, kb kilobytes p memory pages (a page is always 4K). m, mb megabytes g, gb gigabytes t, tb terabytes For options that expect "number" argument (-p and -c) you can optionally specify one of the following suffixes (case-insensitive): k kilo (thousands, 1 000) m mega (millions, 1 000 000) g giga (billions, 1 000 000 000) t tera (trillions, 1 000 000 000 000) EXIT STATUS
Returns 0 upon success. The following error codes are defined: 1 Invalid usage (error in arguments). 2 Error during preparation stage. 3 Error during runtime. EXAMPLES
ioping . Show disk I/O latency using the default values and the current directory, until interrupted. ioping -c 10 -s 1M /tmp Measure latency on /tmp using 10 requests of 1 megabyte each. ioping -R /dev/sda Measure disk seek rate. ioping -RL /dev/sda Measure disk sequential speed. SEE ALSO
Homepage <http://code.google.com/p/ioping/>. AUTHORS
This program was written by Konstantin Khlebnikov <koct9i@gmail.com>. Man-page was written by Kir Kolyshkin <kir@openvz.org>. July 2011 IOPING(1)

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DD(1)									FSF								     DD(1)

NAME
dd - convert and copy a file SYNOPSIS
dd [OPTION]... DESCRIPTION
Copy a file, converting and formatting according to the options. bs=BYTES force ibs=BYTES and obs=BYTES cbs=BYTES convert BYTES bytes at a time conv=KEYWORDS convert the file as per the comma separated keyword list count=BLOCKS copy only BLOCKS input blocks ibs=BYTES read BYTES bytes at a time if=FILE read from FILE instead of stdin obs=BYTES write BYTES bytes at a time of=FILE write to FILE instead of stdout seek=BLOCKS skip BLOCKS obs-sized blocks at start of output skip=BLOCKS skip BLOCKS ibs-sized blocks at start of input --help display this help and exit --version output version information and exit BLOCKS and BYTES may be followed by the following multiplicative suffixes: xM M, c 1, w 2, b 512, kB 1000, K 1024, MB 1,000,000, M 1,048,576, GB 1,000,000,000, G 1,073,741,824, and so on for T, P, E, Z, Y. Each KEYWORD may be: ascii from EBCDIC to ASCII ebcdic from ASCII to EBCDIC ibm from ASCII to alternated EBCDIC block pad newline-terminated records with spaces to cbs-size unblock replace trailing spaces in cbs-size records with newline lcase change upper case to lower case notrunc do not truncate the output file ucase change lower case to upper case swab swap every pair of input bytes noerror continue after read errors sync pad every input block with NULs to ibs-size; when used with block or unblock, pad with spaces rather than NULs AUTHOR
Written by Paul Rubin, David MacKenzie, and Stuart Kemp. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for dd is maintained as a Texinfo manual. If the info and dd programs are properly installed at your site, the com- mand info dd should give you access to the complete manual. dd (coreutils) 4.5.3 February 2003 DD(1)
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