Data Management

Data Management and Layout for Shingled Magnetic Recording

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Executive Summary

Ultimately the performance and success of a shingled write disk will be determined by more than the physical hardware realized, but will depend on the data layouts employed, the workloads experienced, and the architecture of the overall system, including the level of interfaces provided by the devices to higher levels of system software. While the authors discuss several alternative layouts for use with shingled write disk, they also discuss the dramatic implications of observed workloads. Example data access traces demonstrate the surprising stability of written device blocks, with a small fraction requiring multiple updates (the problematic operation for a shingled-write device).

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