dynamic-layout-score · research

Dynamic layout score

Dynamic layout score is a workload-specific locality measure based on the fraction of traced filesystem block requests that are contiguous in logical block address space.

Related Observatory article: Dynamic layout score on hesela.com

Conway and colleagues used blktrace observations to include metadata and cross-file accesses, beyond a per-file layout measure. The score describes an observed access sequence, not an intrinsic property of a device.

Relations

related

filesystem-aging, free-space-fragmentation

Limitations

• It does not distinguish small address gaps from large ones.
• It is not throughput, a percentile latency or a NAND physical-placement measurement.

Citations

1. Conway et al. File Systems Fated for Senescence? Nonsense, Says Science! FAST 2017, pp. 45-58, sections 3.3, 4 and 6. (accessed 2026-10-14)

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