Storage

Effect of Replica Placement on the Reliability of Large-Scale Data Storage Systems

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Executive Summary

Replication is a widely used method to protect large-scale data storage systems from data loss when storage nodes fail. It is well known that the placement of replicas of the different data blocks across the nodes affects the time to rebuild. Several systems described in the literature are designed based on the premise that minimizing the rebuild times maximizes the system reliability. The authors' results however, indicate that the reliability is essentially unaffected by the replica placement scheme.

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