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   1 What:           /sys/block/<disk>/stat
   2 Date:           February 2008
   3 Contact:        Jerome Marchand <jmarchan@redhat.com>
   4 Description:
   5                 The /sys/block/<disk>/stat files displays the I/O
   6                 statistics of disk <disk>. They contain 11 fields:
   7                  1 - reads completed succesfully
   8                  2 - reads merged
   9                  3 - sectors read
  10                  4 - time spent reading (ms)
  11                  5 - writes completed
  12                  6 - writes merged
  13                  7 - sectors written
  14                  8 - time spent writing (ms)
  15                  9 - I/Os currently in progress
  16                 10 - time spent doing I/Os (ms)
  17                 11 - weighted time spent doing I/Os (ms)
  18                 For more details refer Documentation/iostats.txt
  19
  20
  21 What:           /sys/block/<disk>/<part>/stat
  22 Date:           February 2008
  23 Contact:        Jerome Marchand <jmarchan@redhat.com>
  24 Description:
  25                 The /sys/block/<disk>/<part>/stat files display the
  26                 I/O statistics of partition <part>. The format is the
  27                 same as the above-written /sys/block/<disk>/stat
  28                 format.