Sudarsun Kannan, Andrea C. Arpaci-Dusseau, and Remzi H. Arpaci-Dusseau, University of Wisconsin—Madison; Yuangang Wang, Jun Xu, and Gopinath Palani, Huawei Technologies
We present DevFS, a direct-access file system embedded completely within a storage device. DevFS provides direct access without compromising file system integrity, concurrency, crash consistency, and security. A novel reverse-caching mechanism enables the usage of host memory for inactive objects, thus reducing memory load upon the device. Evaluation of an emulated DevFS prototype shows more than 2x higher I/O throughput with direct access and up to a 78% reduction in device RAM utilization.
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