History preservation in a computer storage system
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United States of America Patent
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Feb 24, 2009
Grant Date -
Oct 14, 2004
app pub date -
Jan 7, 2004
filing date -
Feb 26, 2003
priority date (Note) -
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Abstract
A method by which a disk-based distributed data storage system is organized for protecting historical records of stored data entities. The method comprises 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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