Fault Oblivious eXascale Whitepaper Eric Van Hensbergen, Ronald Minnich, Curtis Janssen, Sriram Krishnamoorthy, Andres Marquez, Maya Gokhale, P Sadayappan, Jim McKie, and Jonathan Appavoo Exascale computing systems will provide a thousand-fold increase in parallelism and a proportional increase in failure rate relative to today's machines. Systems software for exascale machines must provide the infrastructure to support existing applications while simultaneously enabling efficient execution of new programming models that naturally express dynamic, adaptive, irregular computation; coupled simulations; and massive data analysis in a highly unreliable hardware environment with billions of threads of execution. In this paper we propose a radically new approach to the data and work distribution model provided by system software based on the unifying formalism of an abstract file system. The proposed hierarchical data model provides simple, familiar visibility and access to data structures through the file system hierarchy, while providing fault tolerance through selective redundancy.