A Sub-management Based Flash Translation Layer Design

Flash translation layer (FTL) is the key component of NAND flash-based storage system. It consists of the translation of the logical address to physical address and wear-leveling technology. This paper proposed a new sub-management based flash translation layer model that can be used in high-speed solid-state storage systems. In this model, the storage space is sub-managed, which is benefit for improving the external bandwidth. When IO size exceeds 32KB,experiments showed the model can improve system bandwidth up to 100% compared with current technology. Moreover, the flash translation layer is broken down into a segment management and translation system for per segment, which reduces the design complexity, and helps to build high-capacity storage systems. Using both inter-segment and in-segment wear-leveling technology, the model can effectively ensure the life of storage systems.