SAS strongly discourages doing an upgrade in place of a major version of an operating system (i.e. RHEL 7 to RHEL 😎 and not reinstalling SAS on the UIP version of RHEL.
In other words, please install RHEL 8 on new hardware and then reinstall SAS Grid on the new hardware.
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.