IBM Lotus Tech Note 1221870, which administrators are referred to in the live domino console, console.log, and in log.nsf, does not provide accurate instructions on how to properly set ulimit for domino server in RHEL 7.
Because of the switch from sysvinit to systemd in this OS, the value needs to be set in the domino.service file (see this wiki article and this man page for more information.) Setting the value in your startup script no longer works (it's not honored by the OS), so a new section should be added to this Tech Note noting the difference in RHEL 7.