I've tried 4x OSD on fast SAS SSDs in a test setup with only 2 such drives
in cluster - it increased CPU consumption a lot, but total 4Kb random
write iops (RBD) only went from ~11000 to ~22000. So it was 2x increase,
but at a huge cost.
One thing that's worked for me to get more out of nvmes with Ceph is to
create multiple partitions on the nvme with an osd on each partition.
That
way you get more osd processes and CPU per nvme device. I've heard of
people using up to 4 partitions like this.
--
With best regards,
Vitaliy Filippov
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
