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   1 What:           /proc/diskstats
   2 Date:           February 2008
   3 Contact:        Jerome Marchand <jmarchan@redhat.com>
   4 Description:
   5                 The /proc/diskstats file displays the I/O statistics
   6                 of block devices. Each line contains the following 14
   7                 fields:
   8                  1 - major number
   9                  2 - minor mumber
  10                  3 - device name
  11                  4 - reads completed succesfully
  12                  5 - reads merged
  13                  6 - sectors read
  14                  7 - time spent reading (ms)
  15                  8 - writes completed
  16                  9 - writes merged
  17                 10 - sectors written
  18                 11 - time spent writing (ms)
  19                 12 - I/Os currently in progress
  20                 13 - time spent doing I/Os (ms)
  21                 14 - weighted time spent doing I/Os (ms)
  22                 For more details refer to Documentation/iostats.txt