擦除编码数据中心可靠性仿真分析

Mi Zhang, Shujie Han, P. Lee
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引用次数: 14

摘要

在生产数据中心中,Erasure编码被广泛用于保护数据存储免受故障的影响。考虑到数据中心的分层性质,描述擦除编码和冗余放置对擦除编码数据中心可靠性的影响至关重要,但在很大程度上尚未得到探索。本文对擦除编码数据中心的可靠性进行了全面的仿真分析。我们通过构建一个名为SIMEDC的离散事件模拟器来进行分析,该模拟器根据从统计模型或生产轨迹获得的数据中心拓扑、擦除代码、冗余位置和不同子系统的故障/修复模式的可配置输入,报告擦除编码数据中心的可靠性指标。我们的仿真结果表明,将擦除编码的数据放置在较少的机架上通常可以通过减少跨机架的修复流量来提高可靠性,即使它在面对相关故障时牺牲了机架级别的容错能力。
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A Simulation Analysis of Reliability in Erasure-Coded Data Centers
Erasure coding has been widely adopted to protect data storage against failures in production data centers. Given the hierarchical nature of data centers, characterizing the effects of erasure coding and redundancy placement on the reliability of erasure-coded data centers is critical yet largely unexplored. This paper presents a comprehensive simulation analysis of reliability on erasure-coded data centers. We conduct the analysis by building a discrete-event simulator called SIMEDC, which reports reliability metrics of an erasure-coded data center based on the configurable inputs of the data center topology, erasure codes, redundancy placement, and failure/repair patterns of different subsystems obtained from statistical models or production traces. Our simulation results show that placing erasure-coded data in fewer racks generally improves reliability by reducing cross-rack repair traffic, even though it sacrifices rack-level fault tolerance in the face of correlated failures.
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