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

项目摘要CSR：Small：Turbo Button：一种面向互联网规模应用的基于SSD的语义智能RAID系统 这是及时和机会，重新考虑设计的闪存SSD集成RAID存储系统的互联网规模的应用。因此，如何充分利用HDD的高顺序I/O性能和高性价比的特性来辅助SSD RAID系统成为一个重要的研究课题。该项目旨在开发一个语义智能SSD（S4 D）框架，以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确定了现有闪存SSD的关键问题，并将文件系统块活性和相关信息传达给具有标准或修改块接口的底层S4 D。其次，S4 D利用块活跃度信息有效地补充日志块池的空闲块，并减少FTL块映射表的大小。最后，基于S4 D，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。该项目的更广泛影响在于其（1）为现有和未来基于闪存和集成闪存的存储系统提供显著性能、可靠性和能效改进的研究开发（特别是RAID结构的存储系统）广泛部署在服务于互联网规模应用程序社区的数据中心;（2）基础设施的发展，加强研究和教育在UNL，并通过访问通过公共领域，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.