srNAND: A Novel NAND Flash Organization for Enhanced Small Read Throughput in SSDs

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 two-stage 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.