Distributed object storage rebuild analysis via simulation with GOBS

Community acceptance of the object storage device model as represented by standards and use in existing HPC filesystems has enabled the development of more complex data storage systems. Object replicas may be placed in a variety of ways to obtain various properties, such as scalable lookup times, concurrent access to multiple objects, and efficient reorganization. The construction of a fully functional object-based parallel filesystem is an enormous effort, so evaluation of potential techniques and algorithms is typically performed by analysis or simulation. In this work, we present an extensible simulator designed to evaluate multiple object placement models under fault-induced rebuilds. We use results obtained by the simulator to weigh the benefits of simple object replica placement models.