As a new generation of high-performance distributed storage system, object-based storage system is being
developed to support high-performance computing environments. In the petabyte-scale object-based storage
system, reasonable data distribution and parameters configuration can improve system performance and
availability. To make the system performance evaluation work easier, we propose an approximate parameters
analysis method to build performance model. We firstly model the whole storage system's architecture based
on closed Fork-Join queue model; using our system architecture model, we then deduce an approximately
analytical expression with erasure codes and replicas to predict the storage system's mean response time
under various workloads simulating the real-world condition. Finally, a large number of comparison
experiments validate our approximately analytical expression of system performance, and proved that our
analytic method is appropriate to build performance model for object-based storage system.
Since a free space optics communication system cannot be free of atmosphere turbulence by nature, a micro-Adaptive Optics system based on Micro-Electro-Mechanical Systems technology is discussed, which meets the volume, weight, power consumption, price and heating/cooling requirements in this case. It not only compensates atmospheric turbulence, but also decreases the wavefront aberration resulted by random gravity, heat and component surface error during manufacturing to some degree. The laboratory experiments are also presented to reveal the benefit that such system can provide. Future possible improvements are addressed as well.