在未来的E级高性能计算系统中，IO子系统将是重要的瓶颈之一，而引入IO节点则是提高IO性能的有效手段。本研究拟在E级高性能计算系统中引入基于固态盘的IO节点系统。在此子系统中存在三方面的问题：（1）固态盘寿命有限，基于SSD的IO节点系统可靠性问题尤其突出；（2）固态盘能够提供空前的性能，但现有软件系统不能充分发挥基于SSD的IO节点系统的优势；（3）简单引入IO节点系统并不能完全消除后端存储系统的性能瓶颈。相应地，本项目从三个方面展开研究：基于固态盘的IO节点系统高可靠体系结构、面向高性能IO节点系统的数据并发访问技术、面向后端存储系统的IO节点系统优化技术。研究的成果将确保基于固态盘的IO节点系统稳定可靠和性能充分发挥，相关技术将应用到未来的E级高性能计算系统中。

The emerging Exascale computing systems are mostly likely to be prohibited by the IO subsystem. By considering that IO node is an efficient method improving IO performance in high performance computing systems, this work proposes to deploy the SSD-based IO node into Exascale computing systems. In such a novel IO subsystem, there are three issues should be addressed. First, the reliability of IO node must be considered seriously as SSDs survive limited lifespan. Second, SSDs are able to supply a plethora of bandwidth which cannot be completely exploited by existing software stack. Third, simply introducing IO nodes into high performance computing system fails to improve the backend storage systems. Accordingly, this work aims at building a reliable as well as high performance IO node cluster by taking measures in three aspects. First, we explore novel architecture that enhances the reliability of SSD-based IO node. Based on the reliable platform built above, we optimize the parallel file system to make IO nodes be capable of responding to ultra-concurrent IO requests. Finally, we develop some intelligent mechanism to optimize the interaction between IO nodes and the backend parallel file system, thus improving the backend storage system as well. Technologies proposed in this research are promising to be applied to the emerging Exascale computing systems.