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History preservation in a computer storage system

  • US 20040167939A1
  • Filed: 01/07/2004
  • Published: 08/26/2004
  • Est. Priority Date: 02/26/2003
  • Status: Active Grant
First Claim
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1. A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities, the method comprising:

  • recording distinct states of an entity, corresponding to different moments of time, as separate entity versions coexisting within the distributed data storage system; and

    assigning expiration times to the entity versions independently within each of a plurality of storage sites according to a shared set of rules, before which times deletion is prohibited.

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