Title: ZNS: Avoiding the Block Interface Tax for Flash-based SSDs
Conference (ATC’21): Link
Journal (): Link
This paper provides (1) empirical evaluation using a ZNS SSD and a conventional block-based SSD in write-intensive worloads, (2) review of ZNS interfaces, (3) ZNS support in Linux kernel and RocksDB, and (4) implementation of a ZNS-based file system, to show the effectiveness of ZNS in reducing write amplification (WA) and improving the performance.
This is a key paper to understand ZNS SSDs, by lifting the majority of FTL functionalities to the host side (e.g., mapping), while keeping the reliability mechanisms (e.g., ECC, bad block management) in SSD controller. Another aspect is that ZNS SSDs only allows sequential writes within a zone, which improves write amplification (WA) and overall performance.
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