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least recently used

   Also found in: Acronyms, Wikipedia 0.04 sec.
least recently used - (operating systems) (LRU) A rule used in a paging system which selects a page to be paged out if it has been used (read or written) less recently than any other page. The same rule may also be used in a cache to select which cache entry to flush.

This rule is based on temporal locality - the observation that, in general, the page (or cache entry) which has not been accessed for longest is least likely to be accessed in the near future.
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With policy-based retention of data on the disk cache, the least recently used data is purged based on watermarks.
Plasmon UDO Archive Appliance Brings Plug-and-Play Compliance to ... by Business Wire
As disk volumes on network servers fill with information, the oldest, least recently used information is moved to less expensive "layers" of storage peripherals such as disk drives, optical jukeboxes, and tape libraries to optimize both the cost of storage and information access time.
Wang to acquire leading network storage management software provider; ... by Business Wire
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