R&D: srNAND, Novel NAND Flash Organization for Enhanced Small Read Throughput in SSDs

IEEE Computer Architecture Letters has published an article written by Jeongho Lee, KAIST Cyber Security Research Center, Daejeon, South Korea, Sangjun Kim, Luminous Company, Daejeon, Republic of Korea, Jaeyong Lee, Department of Computer Science and Engineering, Seoul National University, Seoul, Republic of Korea, Jaeyoung Kang, Department of Computer Science and Engineering, UC San Diego, La Jolla, CA, USA, Sungjin Lee, Department of Electrical Engineering & Computer Science, DGIST, Daegu, South Korea, Nam Sung Kim, University of Illinois Urbana-Champaign, Urbana, U.S.A, and Jihong Kim, Department of Computer Science and Engineering, Seoul National University, Seoul, Republic of Korea.

Abstract: “Emerging data-intensive applications with frequent small random read operations challenge the throughput capabilities of conventional SSD architectures. Although Compute Express Link enabled SSDs allow for fine-grained data access with reduced latency, their read throughput remains limited by legacy block-oriented designs. To address this, we propose srNAND, an advanced NAND flash architecture for CXL SSDs. It uses a twostage ECC decoding mechanism to reduce read amplification, an optimized read command sequence to boost parallelism, and a request merging module to eliminate redundant operations. Our evaluation shows that srSSD can improve read throughput by up to 10.4× compared to conventional CXL SSDs.“