一种采用纠删码缓存的高能效且可靠的存储系统（英文）

发布时间：2018-03-18 17:53

本文选题：可靠性　切入点：高能效　出处：《Frontiers of Information Technology & Electronic Engineering》2017年09期 　论文类型：期刊论文

【摘要】：在现代的多副本节能存储系统中,主副本的磁盘总是保持着开启以对外提供服务,而其他副本的磁盘则可以在负载低时保持关闭状态以节能。然而,因为新的写请求不能够被立即同步到所有的磁盘上,所以系统的可靠性被降低了。本文中,我们设计了一个基于RAID10的具有高可靠性和高能效的副本存储系统——RERAID。RERAID使用主副本磁盘上的一部分空闲空间结合纠删码构造了一个编码缓存来接收新的写请求。因为通过使用纠删码,编码缓存能够支持2个甚至更多磁盘的故障恢复,所以RERAID能够保证与RAID10存储系统想当的可靠性。另外,我们还设计了一个纠删码写(erasure coding write,ECW)算法来缓存那些小的随机写,并把它们合并成大的写数据块,然后并行写入编码缓存中以提高写性能。实验结果显示RERAID相比现有的方案能够提高写性能并且节省更多的能源。
[Abstract]:In modern multi-replica energy-efficient storage systems, the primary copy's disk is always kept open for external service, while the other copies' disks can remain closed to save energy when the load is low. The reliability of the system was reduced because the new write request could not be immediately synchronized to all disks. We design a high reliability and high efficiency replica storage system based on RAID10. RERAID.RERAID constructs an encoding cache to receive new write requests using a part of free space on the primary copy disk combined with erasure code. By using erasure codes, Encoding caches can support two or more disk fail-outs, so RERAID can guarantee the reliability that RAID10 storage systems want. In addition, we have designed an erasure coding write algorithm to cache small random writes. The experimental results show that RERAID can improve the write performance and save more energy than the existing scheme.
【作者单位】： Wuhan
【基金】：Project supported by the National Natural Science Foundation of China(Nos.61472152,61432007,61572209,and 61300047) the Fundamental Research Funds for the Central Universities,China(No.2015QN069) the Director Fund of Wuhan National Laboratory for Optoelectronics(WNLO) the MOE Key Laboratory of Data Storage System,China
【分类号】：TP333

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