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How to use the SysRq facility to collect information from a RHEL server

Solution Verified - Updated 2018-05-01T18:06:45+00:00 -

Issue

How to use the SysRq facility to collect information from a server which is frozen or unresponsive
How to manually force a crash in server hang conditions
If the system goes into a hung state, can a vmcore or core dumps be captured?
How do I enable SysRq to force a kernel panic?

Environment

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 3

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