From Open-Channel SSDs to Zoned Namespaces
summary
Defines Zoned Namespaces (ZNS) as an NVMe proposal that exposes zone-level geometry and a zone append command which returns the actual LBA written, letting host software control placement and reduce write amplification and latency outliers. Shows a Linux prototype path: Linux device-mapper zoned block device plus file-system patches (f2fs, btrfs, xfs) that add sequential-only zones and reuse segment-style allocation. Introduces zone capacity vs zone size (logical vs usable blocks) and reports workable prototypes that lower SSD DRAM needs and simplify firmware.
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chapters (9)
- 0:00Intro
- 0:32Solid State Drive Internals
- 3:06Open-Channel Concepts
- 7:23NVMe Approach
- 8:02Zoned Namespaces (ZNS)
- 11:33Zoned Namespaces similar to ZBC/ZAC for SMR
- 15:49Zone Information
- 22:16Zone Write Example
- 22:50ZNS: Synergy w/ ZAC/ZBC software ecosystem
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