[seastarer]

Some more data on Google PD: https://raw.githubusercontent.com/scylladb/diskplorer/master...

Very odd - notice how the latency is high when the read IOPS are low. When the read IOPS climb, 95th percentile latency drops.

Looks like there is a constant rate of high latency requests, and when the read IOPS climb, that constant rate moves to a higher quantile. I'd inspect the raw results but they're quite big: https://github.com/scylladb/diskplorer/blob/master/latency-m...

Background: https://github.com/scylladb/diskplorer/

[ec109685]

Very interesting. I wonder if higher iops involves reading from more servers and with request hedging it can smooth latency a lot better.