Rethinking erasure codes for cloud file systems: minimizing I/O for recovery and degraded reads

@inproceedings{Khan2012RethinkingEC,
  title={Rethinking erasure codes for cloud file systems: minimizing I/O for recovery and degraded reads},
  author={Osama Khan and Randal C. Burns and James S. Plank and William Pierce and Cheng Huang},
  booktitle={FAST},
  year={2012}
}
To reduce storage overhead, cloud file systems are transitioning from replication to erasure codes. This process has revealed new dimensions on which to evaluate the performance of different coding schemes: the amount of data used in recovery and when performing degraded reads. We present an algorithm that finds the optimal number of codeword symbols needed for recovery for any XOR-based erasure code and produces recovery schedules that use a minimum amount of data. We differentiate popular… CONTINUE READING

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