Application-oriented wear-leveling optimization of 3D TSV-integrated storage class memory-based solid state drives

Storage class memories (SCMs) are expected as next generation non-volatile memory due to their high performance, high scalability and low energy consumption [1]. Since the SCM endurance is limited, wear-leveling is required. Wear-leveling is the function on SSD controller to distribute overwrite count each memory cell and to avoid excessive overwrite to particular cells. However, frequent wear-leveling greatly affects the performance of SSDs. In this paper, the frequency of wear-leveling in SCM-based SSD is optimized for real world application. By optimizing frequency of wear-levering for each application, SCM-based SSD performance improves by 38.6% and energy consumption decreases by 18.0%, respectively. Moreover, energy consumption of SCM-based SSD is reduced by up to 82.8% by introducing through-silicon via (TSV) instead of bonding-wire.