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Wednesday, September 23 • 4:05pm - 4:55pm
Skylight — A Window on Shingled Disk Operation

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We introduce Skylight, a novel methodology that combines software and hardware techniques to reverse engineer key properties of drive-managed ShingledMagnetic Recording (SMR) drives. The software part of Skylight measures the latency of controlled I/O operations to infer important properties of drive-managed SMR, including type, structure, and size of the persistent cache; type of cleaning algorithm; type of block mapping; and size of bands. The hardware part of Skylight tracks drive head movements during these tests, using a high-speed camera through an observation window drilled through the cover of the drive. These observations not only confirm inferences from measurements, but resolve ambiguities that arise from the use of latency measurements alone.We show the generality and efficacy of our techniques by running them on top of three emulated and two real SMR drives, discovering valuable performance-relevant details of the behavior of the real SMR drives.

Speakers
avatar for Peter Desnoyers

Peter Desnoyers

Professor College of Computer and Information Science, Northeastern University
Peter received his PhD in Computer Science from the University of Massachusetts, Amherst in 2008. Prior to that he spent fifteen years as an engineer in industry, at Apple, Motorola, and a number of start-ups, after receiving the BS and MS degrees in EECS from MIT in 1988. Peter's research focuses on operating systems, storage, and cloud computing, drawing on his experience to explore practical solutions to the problems of tomorrow's applications... Read More →


Wednesday September 23, 2015 4:05pm - 4:55pm
Winchester Room

Attendees (4)