Some more data on Google PD: https://raw.githubusercontent.com/scylladb/diskplorer/master/latency-matrix-results/gcp-pd-SSD-2TB.png https://raw.githubuserconten

Some more data on Google PD: https://raw.githubusercontent.com/scylladb/diskplorer/master/latency-matrix-results/gcp-pd-SSD-2TB.png 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-matrix-results/gcp-pd-SSD-2TB.json https://github.com/scylladb/diskplorer/blob/master/latency-m... Background: https://github.com/scylladb/diskplorer/ https://github.com/scylladb/diskplorer/