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 <drakonst...@gmail.com> 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 <jpetr...@coredial.com> > wrote: > >> Anyone have any ideas on this? >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >
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