Data Management

A Scalable Reverse Lookup Scheme Using Group-Based Shifted Declustering Layout

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Executive Summary

Recent years have witnessed an increasing demand for super data clusters. The super data clusters have reached the petabyte-scale that can consist of thousands or tens of thousands storage nodes at a single site. For this architecture, reliability is becoming a great concern. In order to achieve a high reliability, data recovery and node reconstruction is a must. Although extensive research works have investigated how to sustain high performance and high reliability in case of node failures at large scale, a reverse lookup problem, namely finding the objects list for the failed node remains open. This is especially true for storage systems with high requirement of data integrity and availability, such as scientific research data clusters and etc.

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