2DZNS: Enhancing utilization in cloud storage virtualization using two-dimensional parallelism of Zoned Namespace SSD

Abstract

The Zoned Namespace (ZNS) SSDs present a transformative approach to cloud storage with their unique architecture that ensures natural isolation and cost-efficiency due to reduced DRAM requirements. Despite their potential, the application of ZNS SSDs in cloud storage virtualization remains underexplored. This study introduces 2DZNS, a system specifically designed to address the prevalent issue of under-utilization due to the short-term bursty nature of cloud workloads. 2DZNS leverages the inherent die-level isolation of ZNS SSDs to ensure minimum performance for VMs while utilizing zone-level parallelism to effectively manage short-term bursty workloads. Additionally, 2DZNS incorporates a fairness-oriented I/O scheduler to maintain equitable resource distribution among VMs. We demonstrate that 2DZNS significantly enhances utilization and maintains fairness, outperforming other parallelism strategies of ZNS SSD in cloud storage environments.