Trying to install on a XEON E5 2670 (mb MACHINIST RS9 X99) server using the boot.iso
I get an error
What with the Thanksgiving, thin chances to get help from the regulars right now, so I’ll just add what I’d try first.
It might be related to the old bug 2022630 – fail to install rhel9 on specific machine with error /dev/root does not exist whose resolution cannot be seen, as it’s a duplicate of Bug Access Denied.
Still, the last suggestion in the bug report was to add kpti=0 to the kernel command line. You should be able to do that by pressing e in the boot screen.
Other kernel parameters suggested (not all applicable), in the 6th comment.
Just my 2 cents.