S2-RAID: A new RAID architecture for fast data recovery

2010 IEEE 26th Symposium on Mass Storage Systems and Technologies (MSST) Pub Date : 2010-05-01 DOI:10.1109/MSST.2010.5496980

Ji-guang Wan, Jibin Wang, Qing Yang, C. Xie

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引用次数: 16

Abstract

As disk volume grows rapidly with terabyte disk becoming a norm, RAID reconstruction time in case of a failure takes prohibitively long time. This paper presents a new RAID architecture, S2-RAID, allowing the disk array to reconstruct very quickly in case of a disk failure. The idea is to form skewed sub RAIDs (S2-RAID) in the RAID structure so that reconstruction can be done in parallel dramatically speeding up data reconstruction time and hence minimizing the chance of data loss. To make such parallel reconstruction conflict-free, each sub-RAID is formed by selecting one logic partition from each disk group with size being a prime number. We have implemented a prototype S2-RAID system in Linux operating system for the purpose of evaluating its performance potential. SPC IO traces and standard benchmarks have been used to measure the performance of S2-RAID as compared to existing baseline software RAID, MD. Experimental results show that our new S2-RAID speeds up data reconstruction time by a factor of 3 to 6 compared to the traditional RAID. At the same time, S2-RAID shows similar or better production performance than baseline RAID while online RAID reconstruction is in progress.

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S2-RAID:一种新的RAID架构，实现快速数据恢复

随着硬盘容量的快速增长，tb级硬盘已成为一种标准配置，在出现故障时重构RAID的时间非常长。本文提出了一种新的RAID结构，S2-RAID，允许磁盘阵列在磁盘故障的情况下非常快速地重建。其思想是在RAID结构中形成倾斜的子RAID (S2-RAID)，以便可以并行地进行重构，从而大大加快数据重构时间，从而最大限度地减少数据丢失的机会。为了使这种并行重构无冲突，通过从每个磁盘组中选择一个大小为素数的逻辑分区来组成每个子raid。为了评估其性能潜力，我们在Linux操作系统上实现了一个S2-RAID系统的原型。与现有的基准软件RAID相比，SPC IO跟踪和标准基准测试已用于测量S2-RAID的性能。实验结果表明，与传统RAID相比，我们的新S2-RAID将数据重建时间加快了3到6倍。同时，在RAID在线重构过程中，S2-RAID的生产性能与基准RAID相当或更好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 IEEE 26th Symposium on Mass Storage Systems and Technologies (MSST)

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