专利名称：Preferential caching of uncopied logical
volumes in a peer-to-peer virtual tapeserver
发明人：Gregory Tad Kishi,Mark Allan
Norman,Jonathan Wayne Peake,WilliamHenry Travis
申请号：US09892931申请日：20010627
公开号：US20030004980A1公开日：20030102
专利附图：
摘要：Disclosed is a system, method, and an article of manufacture for preferentiallykeeping an uncopied data set in one of two storage devices in a peer-to-peer
environment when data needs to be removed from the storage devices. Each time a dataset is modified or newly created, flags are used to denote whether the data set needs tobe copied from one storage device to the other. The preferred embodiments modify thetimestamp for each uncopied data set by adding a period of time, and thus give
preference to the uncopied data set when the data from the storage device is removedbased on the least recently used as denoted by timestamp of each data set. Once thedata set is copied, the timestamp is set back to normal by subtracting the same period oftime added on when the data set was flagged as needing to be copied.
申请人：INTERNATIONAL BUSINESS MACHINES CORPORATION
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