Hierarchical data storage system and data caching method

Details Hierarchical data storage system and data caching method Hierarchical data storage system and data caching method

G - Physics

06

F

G06F 12/08 (2006.01) G06F 12/12 (2006.01) G11B 27/00 (2006.01) G11B 27/034 (2006.01)

Patent

CA 2279756

In a hierarchical data storage system that supplies data, on request, from a library apparatus in which the data are stored on removable media and from a high-speed cache device, the requests are analyzed to select the most frequently requested data and predict the system's least busy periods. During each predicted least busy period, data are copied from the library apparatus to the cache device, if necessary, so that all of the selected most-frequently- requested data are stored in the cache device. Data are not transferred from the library apparatus to the cache device at other times, thereby avoiding unnecessary cache replacements and improving the efficiency with which requests can be served.

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