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What is the recommended swap size for Red Hat platforms?

Solution Verified - Updated 2016-08-30T04:29:00+00:00 -

Issue

If I add several hundred gigabytes of RAM to a system, do I really need several hundred gigabytes of swap space?
What are the recommended swap size settings for Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, Red Hat Enterprise Open Stack Platform 3 and Red Hat Enterprise Open Stack Platform 4?
How much swap should I assign to a virtual guest, is the recommendation different from a normal system?

Environment

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5
Red Hat Enterprise Open Stack Platform 3
Red Hat Enterprise Open Stack Platform 4
Red Hat Enterprise Linux OpenStack Platform 5

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