There are several other systems I would recommend before TernFS for your environment. If you're looking at Lustre versus this in particular, Lustre has been through the wringer, and ANL/DOE has plenty of people who understand it enough to run it well and fix it when it breaks.
However, you are right. Your bandwidth needs don't really require Lustre.
However, you are right. Your bandwidth needs don't really require Lustre.