Abstract: The advantages of high-performance and low power consumption make flash to get more and more attention. The most common way of utilizing flash is constructing hybrid storage system together with RAM and disks, especially for streaming media application which has strict requirements on both storage capacity and performance. However, accu- rate and full-featured hybrid storage simulation tools arc missing now. Firstly, this paper modeled the architectures and energy consumption of the hybrid storage systems,and then designed and implemented a hybrid storage simulation sys- tem-HybSim. Compared with the widely used storage simulation system-DiskSim and its flash patch, HybSim newly increases some new modules, including the implement of various kinds of hybrid storage architectures, power con- sumption, filclevel management and accessing, streaming media service mode, and the statistics of performance, QoS, energy consumption and device wearing. Some detailed simulations on both the performance and energy conservation were made based on HybSim, and then we compared some typical architectures of hybrid storage on performance, Quali- ty of Service(QoS)，energy saving and device wearing.

Key words: Flash, Hybrid storage, Simulation, Streaming media, Energy saving