E-maih chenzhiguanghit@gmail.com; Zhi-Guang Chen got his bachelor degree of computer science and technology from Harbin Institute of technology, China, in 2007. He achieved his master degree of computer science and technology from National University of Defense Tech- nology (NUDT), China, in 2009. Now he is pursuing his doctor degree in NUDT. His current research inter-est includes distributed file system, network storage and solid state storage system. Corresponding Author {nongxiao}@nudt.edu.cn; Nong Xiao received the B.S., M.S. and Ph.D degrees of com- puter science from NUDT, China. Now he is a professor in the State Key Laboratory of High Performance Computing, NUDT. His current research interest includes large-scale storage system, network computing, and computer architecture. {liufang}@nudt.edu.cn; Fang Liu received the B.S. and Ph.D. degrees of computer science from NUDT, China, in 1999 and 2005 respectively. Now she is an associate professor in the State Key Laboratory of High Performance Computing, NUDT. Her current research interest includes distributed file system, network storage and solid-state storage system. yimodu@gmail.com Yi-Mo Du got his B.S. degree of computer science and technology from Jilin University, China, in 2008. He achieved his M.S. degree of computer science and technology from National University of Defense Technology (NUDT) in 2010. Now he is pursuing his Ph.D. degree in NUDT. His current research interest includes distributed file system, network stor-age and solid state storage system.