A system and method for distributing requests for objects to hosts that store replicas of the objects, and for managing the placement of the replicas among hosts. Metrics for the historical demand of a replica at a host and the distance of the host from the requester of the object are evaluated and used...http://www.google.com.tw/patents/US6484204?utm_source=gb-gplus-share專利 US6484204 - System and method for allocating requests for objects and managing replicas of objects on a network
