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For a given amount of storage overhead, erasure coding offers a higher degree of survivability than pure replication. Consequently, erasure coding attracts much attention these years in the research area of reliable distributed storage systems. Although numerous erasure codes have been put forward, how to choose erasure coding parameters to maximize system reliability has not yet been sufficiently...
In this paper, we argue that the reliability of large-scale storage systems can be significantly improved by using better reliability metrics and more efficient policies for recovering from hardware failures. Specifically, we make three main contributions. First, we introduce NDS (Normalcy Deviation Score), a new metric for dynamically quantifying the reliability status of a storage system. Second,...
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