This tool lets you monitor I/O latency in real time. It shows disk latency in the same way as ping shows network latency.
Usage: ioping [-LABCDWRq] [-c count] [-w deadline] [-pP period] [-i interval] [-s size] [-S wsize] [-o offset] directory|file|device ioping -h | -v -c <count> stop after <count> requests -w <deadline> stop after <deadline> -p <period> print raw statistics for every <period> requests -P <period> print raw statistics for every <period> in time -i <interval> interval between requests (1s) -s <size> request size (4k) -S <wsize> working set size (1m) -o <offset> working set offset (0) -L use sequential operations (includes -s 256k) -A use asynchronous I/O -C use cached I/O -D use direct I/O -W use write I/O *DANGEROUS* -R seek rate test (same as -q -i 0 -w 3 -S 64m) -B print final statistics in raw format -q suppress human-readable output -h display this message and exit -v display version and exit
https://code.google.com/p/ioping/
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