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On the Reliability of RAID Systems: An Argument for More Check Drives

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Executive Summary

In this paper, the authors address issues of reliability of RAID systems. They focus on "Big data" systems with a large number of drives and advanced error correction schemes beyond RAID 6. Their RAID paradigm is based on Reed-Solomon codes, and thus they assume that the RAID consists of N data drives and M check drives. The RAID fails only if the combined number of failed drives and sector errors exceeds M, a property of Reed-Solomon codes.

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