CSR: Small: Turbo Button: A Semantically-Smart SSD-based RAID System for Internet-Scale Applicationsa

项目摘要csr: Small: Turbo Button：一种基于语义智能ssd的互联网级应用RAID系统。重新思考基于ssd的互联网级应用RAID存储系统的设计是一个及时的机会。因此，如何最好地利用HDD的高顺序i /O性能和经济高效的特点来辅助基于ssd的RAID系统成为一个重要的研究课题。本项目旨在开发一个语义智能SSD （S4D）框架，探索和利用文件系统和应用程序语义信息，以提高闪存SSD的性能和可靠性。特别是，该项目定性和定量地识别现有闪存ssd的关键问题，并通过标准或修改的块接口将文件系统块活跃度和相关信息传递给底层S4D。其次，S4D利用区块活跃度信息，有效地为日志块池补充空闲块，减小FTL块映射表的大小。最后，基于S4D，设计并构建了一个SSD-HDD-Hybrid RAID存储系统Turbo Button，以充分利用HDD的优势，解决直接将RAID算法应用于ssd的问题。该项目更广泛的影响在于：(1)研究开发，为现有和未来广泛部署在服务于互联网规模应用社区的数据中心的基于闪存和集成闪存的存储系统（特别是raid结构存储系统）提供显著的性能、可靠性和能效改进；(2)基础设施发展，加强UNL的研究和教育，并通过公共领域的可访问性，加强高性能和数据密集型计算社区。

Project AbstractCSR: Small: Turbo Button: A Semantically-Smart SSD-based RAID System for Internet-Scale Applications It is timely and opportunistic to rethink the designs of flash-memory SSD-integrated RAID storage systems for Internet-scale applications. Therefore, how to best utilize the high sequential-I/O performance and cost-efficient characteristics of HDD to assist the SSD-based RAID systems becomes an important research issue. This project seeks to develop a Semantically-Smart SSD (S4D) framework to explore and exploit the file system and application semantic information to boost the performance and improve the reliability of flash-memory SSDs. In particular, this project qualitatively and quantitatively identifies the critical issues for existing flash-memory SSDs, and conveys the file-system block liveness and correlation information to the underlying S4D with the standard or modified block interface. Secondly, S4D exploits the block liveness information to efficiently supplement the log-block pool with free blocks, and reduce the FTL block mapping table size. Finally, based on S4D, Turbo Button, an SSD-HDD-Hybrid RAID storage system, will be designed and constructed, in order to leverage the advantages of HDD judiciously to address the problems of straightforwardly applying RAID algorithms to SSDs. The broader impact of the project lies in its (1) research development that provides significant performance, reliability, and energy-efficiency improvement for existing and future flash-based and flash-integrated storage systems (specially RAID-structured storage systems) widely deployed in data centers that serve the Internet-scale application community; (2) infrastructure development that enhances research and education at UNL and, through accessibility via public domain, the high performance and data-intensive computing community.