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Erasure Coding for Storage Applications

Half Day Morning
(9:00 am-12:30 pm)

Gold Room

T2
James S. Plank, University of Tennessee
Cheng Huang, Microsoft Research
Description: 

From disk arrays through clouds to archival systems, storage systems must tolerate failures and prevent data loss. Erasure coding provides the fundamental technology for storage systems to add redundancy and tolerate failures. This tutorial will cover the fundamentals of erasure coding, the mechanics of many erasure codes that apply to today's storage systems, and the properties of various erasure codes designed for a variety of storage scenarios.

Topics include: 
  • General matrix-based codes, starting with classic Reed-Solomon codes
  • Galois Field arithmetic for erasure-coding, and how to implement it efficiently
  • RAID-6 codes: RDP, EVENODD, Minimum Density, X-Code
  • More general codes implemented with only the XOR operation: Generalized RDP/EVENODD
  • Cauchy Reed-Solomon codes
  • Open source library support for erasure codes
  • The reconstruction problem and techniques to reduce bandwidth and I/O
  • Regenerating codes
  • Practical MDS codes with efficient reconstruction: Rotated Reed-SolomonĀ 
  • Practical non-MDS codes with efficient reconstruction and their application in cloud storage: Pyramid codes, LRC and its deployment in Windows Azure Storage, PMDS
  • Erasure coding for Flash

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