sfs · research

SFS

SFS is a research log-structured filesystem that groups file blocks by estimated update likelihood before writing segments.

Min et al.'s FAST 2012 prototype modifies NILFS2. Grouping aims to leave nearly empty victims and nearly full cold segments; hotness uses update count and recency. Its write-cost metric includes bandwidth-weighted cleaning reads as well as writes. [1]

Relations

related

Host-side flash GC, F2FS

Limitations

• The paper's performance and erase results are historical experiments and simulations, not current SSD guarantees. [1]

Citations

1. Min, Kim, Cho, Lee and Eom. SFS: Random Write Considered Harmful in Solid State Drives. FAST 2012, sections 3.1-3.6 and 4.1-4.4. (accessed 2026-11-14)

Further reading

2. Hesela: lifetime grouping and the cost of cleaning (accessed 2026-11-14)

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