METHODS OF MANAGING BUFFER CACHE USING SOLID STATE DISK AS AN EXTENDED BUFFER AND APPARATUSES FOR USING SOLID STATE DISK AS AN EXTENDED BUFFER

摘要

PURPOSE: A buffer cache management method and an apparatus for using an SSD(Solid State Disk) as an expansion buffer are provided to reduce a writing/reading operation of a disk by referring to an SSD expansion buffer when a page having previous time information is read. CONSTITUTION: A main memory device(510) includes an LRU-K list using an LRU-K algorithm, a first priority queue, and a second priority queue. In case there is no buffer space for a reference page in a main memory, an SSD expansion buffer(520) records a page including longest second reference time information or a page excluding second reference time information. The page excluding the second reference time information is included on the LRU-K list.