BOOSTER: Rethinking the erase operation of low-latency SSDs to achieve high throughput and less long latency

Abstract

The disregarded performance of erase operation in low-latency NAND flash memory relatively increases the impact of garbage collection interferences, which is a challenge when considering the use for storage class memory applications. Conventional erase-related techniques do not sufficiently conceal the impact of erase operation and incur a performance trade-off between throughput and latency. In this paper, we propose a boost and stop erase (BOOSTER) technique consisting of a multi-block erase technique and an adaptive erase suspension technique. The proposed technique improves both throughput and latency of low-latency NAND flash-based SSDs. Our experiments show 1.15× higher throughput and 27.2% lower latency than the conventional techniques in the small random workload. The proposed technique also passes the certification test with 1.8 to 4.9× higher load in Aerospike Certification Tool evaluations.