DRAM Cache Management with Request Granularity for NAND-based SSDs
Haodong Lin, Zhibing Sha, Jun Li, Zhigang Cai, Balazs Gerofi, Yuanquan Shi, Jianwei Liao · 2022
Most flash-based solid-state drives (SSDs) employ an on-board Dynamic Random Access Memory (DRAM) to cache hot data at the SSD page granularity. This can significantly reduce the number of flush operations to the underlying arrays of SSDs given that there is sufficient locality in the applications’ I/O access pattern. We observe, however, that in most I/O workloads over SSDs the buffered data of small sized requests are more likely to be re-accessed than those of larger requests, which also require more DRAM space for caching their data.