On Mon, Oct 29, 2018 at 4:23 PM Rick Stevens <ricks@alldigital.com> wrote:

Do big IBM (or any) mainframes still exist?


Here are the requirements for running RedHat on s/390 mainframes, so, yes to both:

https://access.redhat.com/documentation/en-us/red_hat_network_satellite/5.4/html/installation_guide/sect-installation_guide-hardware_requirements-s390_hardware_requirements