ScalaAFA: Constructing User-Space All-Flash Array Engine with Holistic Designs

on YouTube ↗19m

" summary

ScalaAFA is a user-space all‑flash array engine implemented on SPDK and evaluated with FAMU-emulated PCIe5 SSDs that offload replication‑to‑striping conversion to drive controllers via custom NVMe commands and the SSD XOR engine. It replaces locks with message-passing permission management, stores frequently updated maps in SSD out‑of‑band metadata, and uses user-space threads plus offload conversion to SSDs to cut CPU overhead. Results show up to 2.5× write throughput and about 52.7% average write latency reduction, reaching near‑ideal throughput with a single host thread.

AI-written summary · about

" chapters (14)

1. 0:00ScalaAFA project intro
2. 1:28Two-phase AFA design challenges
3. 3:15High-speed SSD bottlenecks
4. 5:23Two-phase AFA beyond parity
5. 6:05ScalaAFA holistic design
6. 7:27Storage space abstraction
7. 8:50Concurrency with space manager
8. 9:53Offloading to SSD controllers
9. 11:23Mapping table updates
10. 13:09Evaluation setup and comparison
11. 14:34Microbenchmark results
12. 16:21Real workload improvements
13. 17:05RocksDB end-to-end eval
14. 17:27Test results and conclusion