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Swap usage high even when memory is 50% free

Solution Unverified - Updated 2018-05-10T11:09:09+00:00 -

Issue

Swap usage high even when memory is 50% - 85% free
Why the free memory is not being utilized and swap is being used instead ?

Environment

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

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