MapR-FS: What are the limitations on open source edition

I'm looking to use MapR-FS and trying to understand the differences between the open-source and enterprise editions . The features that I want to use ("Direct Access NFS" and "MapR POSIX Client") have limitations with little details. So, the practical question is: **Is it possible to use open-source Mapr-fs in a distributed manner and achieve minimal high-availability and fault-tolerance?**