How do you test what total 4Kb random write iops (RBD) you have? -----Original Message----- From: Vitaliy Filippov [mailto:vitalif@xxxxxxxxxx] Sent: 24 February 2019 17:39 To: David Turner Cc: ceph-users; 韦皓诚 Subject: *****SPAM***** Re: Configuration about using nvme SSD 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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