APPARATUS AND METHOD FOR OPTIMIZATION FOR IMPROVED PERFORMANCE AND ENHANCED LIFETIME OF HYBRID FLASH MEMORY DEVICES

摘要

The present invention relates to a method for optimizing the performance and lifetime of a hybrid SSD. The hybrid SSD may be configured in various combinations including SLC, MLC, TLC flash memories. The present invention defines a lifetime model to optimize performance. The lifetime model suggests a method for allocating hot and cold data that maximizes the lifetime of the entire flash memory by finding the optimal solution. On the other hand, the present invention defines a write cost model other than the lifetime mode and suggests a method of allocating the hot and cold data in each flash memory by finding the optimal solution in the write cost model. Further, the present invention suggests a management method capable of the appropriate compromise between the two models depending on the weight of the lifetime and performance of the entire flash memory.