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Userspace Data-Placement Shim for Log-Structured SSD Storage

A userspace shim that intercepts application I/O and issues dynamic placement hints so data with similar lifetime and application affinity is clustered on modern SSDs, without modifying the application, filesystem, or kernel. By remapping onto Zoned Namespace and Flexible Data Placement interfaces it cuts garbage collection and write amplification, raising write throughput and lowering tail latency for log-structured data-intensive systems.

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Valet: Efficient Data Placement on Modern SSDs Devashish R. Purandare

Valet is a userspace shim layer that improves data placement on modern SSDs without changing the application, filesystem, or kernel. NAND-flash SSDs cannot update in place and erase in large units, s…