eZNS: An Elastic Zoned Namespace for Commodity ZNS SSDs
summary
eZNS exposes an adaptive zone abstraction that dynamically reallocates physical active zones across tenants using a centralized zone arbiter and a hierarchical I/O scheduler with read congestion control and device‑level write admission. Implementation is a thin SPDK layer over RDMA targeting commodity small‑zone ZNS SSDs (96 MB zones, up to 256 active zones); evaluations on RocksDB and microbenchmarks show up to 17.7% higher throughput and 80.3% lower tail latency.
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chapters (8)
- 0:00Background and challenges
- 1:23ZNS SSD overview
- 2:51Performance analysis of ZNS
- 5:57Introducing E-ZNS
- 8:37Dynamic zone management
- 10:08Zone-aware scheduling
- 11:39Evaluation and results
- 13:22Conclusion
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