A reliable and energy-efficient storage system with erasure coding cache

Ji-guang WAN; Da-ping LI; Xiao-yang QU; Chao YIN; Jun WANG; Chang-sheng XIE

doi:10.1631/FITEE.1600972

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A reliable and energy-efficient storage system with erasure coding cache

Regular Papers | Updated：2022-05-19

- A reliable and energy-efficient storage system with erasure coding cache
- 一种采用纠删码缓存的高能效且可靠的存储系统
- Frontiers of Information Technology & Electronic Engineering Vol. 18, Issue 9, Pages: 1370-1384(2017)
- Affiliations：
  
  Wuhan National Laboratory for Optoelectronics, Department of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
- Author bio：
  
  Ji-guang WAN, E-mail: jgwan@mail.hust.edu.cn
  [ "Da-ping LI, E-mail: ldplcp@qq.com" ]
  [ "Chang-sheng XIE, E-mail: cs_xie@mail.hust.edu.cn" ]
- Funds：
- DOI：10.1631/FITEE.1600972
  CLC： TP316.4
- Received：31 January 2016，
  
  Revised：2017-;9-23，
  
  Published：2017-09
- Accepted：
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Ji-guang WAN, Da-ping LI, Xiao-yang QU, et al. A reliable and energy-efficient storage system with erasure coding cache[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(9): 1370-1384.
DOI：

Ji-guang WAN, Da-ping LI, Xiao-yang QU, et al. A reliable and energy-efficient storage system with erasure coding cache[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(9): 1370-1384. DOI： 10.1631/FITEE.1600972.

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 energy-saving replication storage systems

a primary group of disks is always powered up to serve incoming requests while other disks are often spun down to save energy during slack periods. However

since new writes cannot be immediately synchronized into all disks

system reliability is degraded. In this paper

we develop a high-reliability and energy-efficient replication storage system

named RERAID

based on RAID10. RERAID employs part of the free space in the primary disk group and uses erasure coding to construct a code cache at the front end to absorb new writes. Since code cache supports failure recovery of two or more disks by using erasure coding

RERAID guarantees a reliability comparable with that of the RAID10 storage system. In addition

we develop an algorithm

called erasure coding write (ECW)

to buffer many small random writes into a few large writes

which are then written to the code cache in a parallel fashion sequentially to improve the write performance. Experimental results show that RERAID significantly improves write performance and saves more energy than existing solutions.

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references

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