2 ms·
It would be far more useful to see the upper percentiles of latency than an average, and to see the tests run over a sustained period of time. As usual, the in
by jen20 8y ago
It would be far more useful to see the upper percentiles of latency than an average, and to see the tests run over a sustained period of time.
As usual, the interesting information comes not during regular operation, but during incidents, where it is not uncommon for the latency to spike _massively_.
- ed_elliott_asc 8y agoHi, The percentiles are in the images, I was being lazy and didn’t add them to the text. If enough (well a few) people want them I’ll add them. Azure storage either works for days and weeks 100% consistently or they have an outage and are down for days so even when I have run longer tests they don’t show any didference. If you monitor and they have an outage the latency basically goes to a day an iop :)
- jen20 8y agoHeh - I only did a scan read, but the 99.9th percentile would be much more useful than the average in the table. I agree on the last part - but I think it's important to measure the effects during outage too. One we often see is fsync operations taking minutes with write caching disabled - this is more common than just during outages however!
- ed_elliott_asc 8y agoLeave it with me and I’ll get some longer runs