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Erasure coding provides durability with less overhead than replication because

  • A.it stores less data than was written
  • B.it deduplicates the identical objects
  • C.parity fragments allow reconstruction
  • D.it compresses the data before storing

Answer: C

A scheme storing ten data and four parity fragments survives four losses for forty per cent overhead rather than the two hundred of three copies. The cost is more computation and slower reconstruction of a lost fragment.

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