On Sat, Mar 11, 2017 at 4:24 PM, Laszlo Budai <laszlo@xxxxxxxxxxxxxxxx> wrote: >>> Can someone explain the meaning of osd_disk_thread_ioprio_priority. I'm >>> [...] >>> >>> Now I am confused .... :( >>> >>> Can somebody bring some light here? >> >> >> Only to confuse you some more. If you are running Jewel or above then >> scrubbing is now done in the main operation thread and so setting this >> value >> will have no effect. > > > There is the hammer version of ceph. As the documentation (http://docs.ceph.com/docs/hammer/rados/configuration/osd-config-ref/) explains, osd_disk_thread_ioprio_priority is ineffective unless you're using the CFQ I/O scheduler. Most server I/O stack configurations (including typical Ceph OSD nodes) run with the deadline scheduler either by default or by best-practice configuration, so this option has no effect on such systems. You can check /sys/block/<device>/queue/scheduler to see which scheduler your devices are currently using. Cheers, Florian _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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