python diskstats.py -h
usage: diskstats.py [-h] [-l sleep] [-d name [name ...]]

Parser tool for /proc/diskstats

optional arguments:
  -h, --help            show this help message and exit
  -l sleep, --loop sleep
                        Runs the program in a loop. Takes the looptime as
                        option.
  -d name [name ...], --device name [name ...]
                        Names, like sda, sda1...

The /proc/diskstats file displays the I/O statistics
of block devices. Each line contains the following 14
fields:
    1 - major number
    2 - minor mumber
    3 - device name
    4 - reads completed successfully
    5 - reads merged
    6 - sectors read
    7 - time spent reading (ms)
    8 - writes completed
    9 - writes merged
   10 - sectors written
   11 - time spent writing (ms)
   12 - I/Os currently in progress
   13 - time spent doing I/Os (ms)
   14 - weighted time spent doing I/Os (ms)
    For more details refer to Documentation/iostats.txt