Increase/Decrease/Disable scrollback buffer on console in RHEL 5 and 6

Solution Verified - Updated -

Issue

Is there a way to disable scrollback history on terminal with default minimal rhel5 installation so that everything that goes of the screen is gone for good and is not viewable by scrolling up with Shift+PgUp or other shortcuts?

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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