SMART stats are only one source of data though that can be predictors of drive failures. Hard drives can experience latency spikes and erratic performance compa

SMART stats are only one source of data though that can be predictors of drive failures. Hard drives can experience latency spikes and erratic performance compared to peers before SMART records problems, for example. This is part of why predictive monitoring can be so difficult - the data you didn't know you needed is probably among the ones you didn't ingest into your metrics, and you can't dump literally everything in /proc every other second to your metrics system without sacrificing some CPU or network bandwidth either.