Storage

Evaluating and Repairing Write Performance on Flash Devices

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Executive Summary

In the last few years NAND flash storage has become more and more popular as price per GB and capacity both improve at exponential rates. Flash memory offers significant benefits compared to magnetic Hard Disk Drives (HDDs) and DBMSs are highly likely to use flash as a general storage backend, either alone or in heterogeneous storage solutions with HDDs. Flash devices, however, respond quite differently than HDDs for common access patterns, and recent research shows a strong asymmetry between read and write performance. Moreover, flash storage devices behave unpredictably, showing a high dependence on previous IO history and usage patterns. In this paper the authors investigate how a DBMS can overcome these issues to take full advantage of ?ash memory as persistent storage.

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