Networking

NCFS: On the Practicality and Extensibility of a Network-Coding-Based Distributed File System

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Executive Summary

An emerging application of network coding is to improve the robustness of distributed storage. Recent theoretical work has shown that a class of regenerating codes, which are based on the concept of network coding, can improve the data repair performance over traditional storage schemes such as erasure coding. However, there remain open issues regarding the feasibility of deploying regenerating codes in practical storage systems. The authors present NCFS, a distributed file system that realizes regenerating codes under real network settings. NCFS transparently stripes data across multiple storage nodes, without requiring the storage nodes to coordinate among themselves.

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