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How does one read and understand the output provided by iostat -x command?

Solution Verified - Updated 2018-08-10T14:42:35+00:00 -

Issue

How does one read and understand the output provided by iostat -x command?
What do the diffierent iostat values mean?
What is the meaning of all attributes having found in the out put of "iostat" command?
How can total iops (io commands per second) be calculated or determined using iostat output?
Do iostat rsec/s and wsec/s output columns means read IOPS and write IOPS, and is the combination of those equal to total IOPS?
Which fields within /proc/diskstats are used for which columns of iostat -x?

Environment

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5

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