Replica Placement Strategies for Wide-Area Storage Systems

نویسندگان

  • Byung-Gon Chun
  • Hakim Weatherspoon
چکیده

Wide-area durable storage systems trigger data recovery to maintain target data availability levels. Data recovery needs to be triggered when storage nodes permanently fail, i.e., data is lost. Transient failures, where nodes return from failure with data, add noise to determining that a node has failed permanently. Replica placement strategies maintain data availability while minimizing cost, wide-area bandwidth. Correlated failures can compromise data availability. We demonstrate that correlated downtimes exist and that simple replica placement strategies can overcome the correlation and maintain target data availability levels.

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تاریخ انتشار 2004