hesela.devSlowdown ratio
In Perseus, the slowdown ratio is observed drive latency divided by the workload-dependent upper prediction bound for that latency.
Use the same units for numerator and denominator: a ratio above one exceeds the bound. Section 4.4 and its example establish this direction despite the reversed Figure 9 caption. This is a sample-level quantity, not a calibrated failure probability or a drive diagnosis. [1]
Relations
- related
- fail-slow, latency-storage