Hi David,
Thanks for the info. The controller in the server (perc h730) was just replaced and the battery is at full health. Prior to replacing the controller I was seeing very high iowait when running iostat but I no longer see that behavior - just apply latency when running ceph osd perf. Since there's no iowait it makes me believe that the latency is not being introduced by the hardware; though I'm not ruling it out completely. I'd like to know what I can do to get a better understanding of what the OSD processes are so busy doing because they are working much harder on this server than the others.On Thu, Dec 14, 2017 at 11:33 AM, David Turner <drakonstein@xxxxxxxxx> wrote:
We show high disk latencies on a node when the controller's cache battery dies. This is assuming that you're using a controller with cache enabled for your disks. In any case, I would look at the hardware on the server.On Thu, Dec 14, 2017 at 10:15 AM John Petrini <jpetrini@xxxxxxxxxxxx> wrote:______________________________Anyone have any ideas on this?_________________
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