eZNS - An Elastic Zoned Namespace for Commodity ZNS SSDs

Explore a 14-minute conference talk from OSDI '23 that introduces eZNS, an innovative elastic-zoned namespace interface for commodity Zoned Namespace (ZNS) SSDs. Discover how eZNS addresses the limitations of static zoned interfaces by providing an adaptive zone with predictable characteristics. Learn about the two main components of eZNS: the zone arbiter for resource management on the control plane, and the hierarchical I/O scheduler with read congestion control and write admission control on the data plane. Understand how eZNS enables transparent use of ZNS SSDs and bridges the gap between application requirements and zone interface properties. Examine the performance improvements demonstrated through RocksDB evaluations, where eZNS outperforms static zoned interfaces by up to 17.7% in throughput and 80.3% in tail latency. Gain insights into the potential of eZNS to enhance cost-efficiency and mitigate performance unpredictability in future storage infrastructure.