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Gracefully degradable versioned storage systems

  • US 7,849,354 B2
  • Filed: 06/12/2007
  • Issued: 12/07/2010
  • Est. Priority Date: 06/12/2007
  • Status: Active Grant
First Claim
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1. A method for use in a distributed storage system, the method comprising:

  • maintaining a plurality of versions of a data item including a latest version and an older version, wherein the plurality of versions of the data item include a plurality of older versions of the data item, each older version being associated with a different time based on storage of that older version of the data item;

    entering a degraded state on the distributed storage system, wherein the degraded state has a degree of degradation based on the version of the data item that is used during processing in the degraded state; and

    if the latest version of the data item is unavailable in the degraded state, then using the older version of the data item during processing in the degraded state.

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