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How to determine how much I/O load is coming currently with the value of %util appeared by running 'iostat -x' in RHEL ?

Solution In Progress - Updated 2016-04-12T05:02:25+00:00 -

Issue

As known, the value of %util appeared by running 'iostat -x' is that the CPU time rate is used to issue I/O requested from device. how can we determine how much I/O load is becoming currently with this value?

Environment

Red Hat Enterprise Linux

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