Hi ~ We have used nvme ssd as storage medium, and found that the hardware performance was not well developed. Should we change some parameter? And bluestore provides NVMEDevice using SPDK to optimize performance, dose anyone know if this module is stable? Our hardware configuration is 8 nvme SSD in 3 nodes: cluster: id: ed0e8dfd-63d8-4862-b9fc-652eac270b08 health: HEALTH_ERR nodeep-scrub flag(s) set 1 full osd(s) 3 nearfull osd(s) 4 pool(s) full application not enabled on 3 pool(s) services: mon: 1 daemons, quorum SH-IDC1-10-5-39-171 mgr: SH-IDC1-10-5-39-170(active), standbys: SH-IDC1-10-5-139-172, SH-IDC1-10-5-39-171 osd: 96 osds: 96 up, 96 in flags nodeep-scrub data: pools: 5 pools, 5376 pgs objects: 271M objects, 30448 GB usage: 65622 GB used, 104 TB / 168 TB avail pgs: 5376 active+clean io: client: 0 B/s rd, 0 op/s rd, 0 op/s wr We can get 513558 IOPS in 4K read per nvme by fio but only 45146 IOPS per OSD.by rados. Thanks~ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com