System shall be considered RT iff /sys/kernel/realtime exists and value is 1.
https://code.engineering.redhat.com/gerrit/55463
verified in redhat-certification-hardware-1.7.1-20150828. realtime is correctly detected when running realtime kernels, and is not otherwise scheduled.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-1709.html