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Cache object store

  • US 6,542,967 B1
  • Filed: 06/22/1999
  • Issued: 04/01/2003
  • Est. Priority Date: 04/12/1999
  • Status: Expired due to Term
First Claim
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1. A cache object store organized to provide fast and efficient storage of data as cache objects organized into cache object groups, the cache object store comprising:

  • a primary-level store and a secondary-level store;

    a cache grouper for logically associating cache objects into cache object groups; and

    a cache object manager cooperatively coupled to the cache grouper and configured to implement an aging policy, the aging policy maintaining a first cache object groups on the primary-level store and a second cache object groups on the secondary-level store;

    a cache directory manager cooperatively coupled to the cache object manager to implement a storage management policy that moves certain first cache object groups from the primary-level store for storage on the secondary-level store as second cache object groups, and the aging policy is a modified least recently used (LRU) algorithm that marks each cache object group with (i) a time of last access (TLA) factor within the cache object store, and (ii) a cost of reacquisition (COA) factor used to determine which cache object group to delete or move.

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