METHOD AND APPARATUS FOR CONTROLLING WRITING DATA IN STORAGE UNIT BASED ON NAND FLASH MEMORY

摘要

The present invention provides a method and an apparatus for controlling writing data in a storage unit based on a NAND flash memory for improving lift time and the performance of random writing which is an important problem in the storage unit based on the NAND flash memory. The present invention relates to a method for controlling writing data including the NAND flash memory comprising: a step of determining reference values in each group for classifying dirty pages written in the storage unit with a plurality of groups; a step of calculating hotness indicating the conversion availability of data for each dirty page; a step of classifying the dirty pages into groups corresponding to the reference value which is close to the calculated hotness; a step of determining that the size of each group is larger than the size of a segment as unit which requests writing to the storage unit; and a step of requesting the writing with the unit of the segment for a larger size group and the same size group. [Reference numerals] (310) Writing request?; (320) Determining reference values in each group; (330) Hotness calculation; (340) Classifying dirty pages into each group according to reference values in each group; (350) Is it lager than a segment?; (360) Executing writing operation with a segment unit; (AA) START; (BB,DD) NO; (CC,EE) YES; (FF) END