zQoS: Unleashing full performance capabilities of NVMe SSDs while enforcing SLOs in distributed storage systems
Liuying Ma, Zhenqing Liu, Jin Xiong, Yue Wu, Renhai Chen, Xi Peng, Ying Zhang, Gong Zhang, Dejun Jiang · 2024
Nowadays, data centers consolidate latency-critical (LC) tenants and best-effort (BE) tenants on the same cloud platform to increase resource utilization and reduce costs. In such a scenario, the underlying distributed storage systems are responsible for guaranteeing SLOs for LC tenants while maximizing bandwidth for BE tenants. As high-performance NVMe SSDs are widely deployed, how to make full use of their performance capabilities and guarantee SLOs has become an urgent problem. However, current methods restrict the performance capabilities of NVMe SSDs based on a conservative offline model, and also ignore runtime changes in tenant loads and device states, which definitely affect the performance capabilities.