CSR-PDOS: Energy-Efficient, High-Performance Storage Array Systems

高性能存储子系统所消耗的能量直接或间接地增加了I/O密集型应用的操作计算系统的成本。节能存储系统的发展可以大大降低获取和操作大型计算平台的成本，从而使它们具有成本效益，适用于广泛的计算问题。解决方案需要作为现有存储系统技术（如RAID）的扩展来构建。本研究通过设计和实现冗余感知、动态I/O调度算法、缓存管理软件和静态块分配算法来解决上述问题，这些算法可作为构建高能效高性能存储阵列的基础，用于要求苛刻的I/O密集型应用。通过功率感知的请求调度/转换方案，利用存储阵列固有的冗余性，将磁盘访问模式转变为节能且高性能保证的模式。对两种常用的存储阵列系统架构——镜像磁盘阵列和奇偶校验磁盘阵列进行了深入的研究。研究了一种扩展的raid -混合存储阵列。本研究的意义在于解决日益重要的高性能存储子系统的节能问题。它将通过提供节能的高性能存储解决方案，对低功耗计算和I/O系统社区产生广泛的影响，现代存储服务器、存储集群和数据中心可以从中受益。在项目过程中，节能RAID的原型版本及其扩展变体混合存储阵列将交付给计算机系统社区。

The energy consumed by the high-performance storage subsystems increases the cost of operating computing systems for I/O intensive applications, both directly and indirectly. The development of energy-efficient storage systems can greatly reduce the cost of acquiring and operating large computing platforms, thereby making them cost-effective for a broad range of computational problems. Solutions need to be built as extensions to existing storage-system technologies such as RAID. This research addresses the above-mentioned problems by designing and implementing redundancy-aware, dynamic I/O scheduling algorithms, cache management software and static block distribution algorithms that serve as a foundation for building energy-efficient high-performance storage arrays for demanding I/O-intensive applications. The inherent redundancy of storage array is used to change the disk access pattern toward energy-efficiency with high-performance guarantee by power-aware request dispatch/transformation schemes. Two commonly used storage array system architectures, mirrored disk arrays and parity disk arrays are thoroughly studied. An extended variant of RAID-hybrid storage array is investigated as well. The significance of the proposed research is to solve the energy conservation problem for ever-important high-performance storage subsystems. It will have broad impact in the low-power computing and I/O systems community by providing an energy-efficient high-performance storage solution, which modern storage servers, storage clusters and data centers can benefit. During the course of the project, prototype versions of the energy efficient RAID and its extended variant-hybrid storage array will be delivered to the computer systems community.