The /proc/diskstats file is used to get the each disk I/O statistics. But, it returns the raw value.
How to calculate the Disk Queue Length and Disk Busy time from the raw values.
Answer:
The "Disk Queue Length" is a term more tied to Windows rather than Linux.
You can, however, install "iostat" tool, it has plenty of useful information.
Here's the meaning of each value in /proc/diskstats :
Field 1 -- # of reads issued
Field 2 -- # of reads merged, field 6 -- # of writes merged
Field 3 -- # of sectors read
Field 4 -- # of milliseconds spent reading
Field 5 -- # of writes completed
Field 7 -- # of sectors written
Field 8 -- # of milliseconds spent writing
Field 9 -- # of I/Os currently in progress
Field 10 -- # of milliseconds spent doing I/Os
Field 11 -- weighted # of milliseconds spent doing I/Os
