The Zoned Namespace (ZNS) SSD is a newly introduced storage device and provides several new ZNS commands to upper-level applications. Zone-reset command is one of the ZNS commands to erase all the flash blocks within a zone. Since data is grouped and erased in zone units, ZNS SSDs are widely used in LSM-tree-based stores. However, the basic invalidated unit in LSM-tree is an SST/WAL file, which mismatches the erasing unit of a ZNS SSD. Placing different SST/WAL files in the same zone, LSM-tree on ZNS SSDs faces dramatic space amplification and extensive data migration problems.
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Liu et al. (2024) studied this question.
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