2 OSD vs 1 OSD per NVMe Analysis
Recently I was asked about Ceph performance when using 2 NVMe drives per OSD vs 1 NVMe drive per OSD. I was able to use the Officinalus cluster that Intel graciously donated to the Ceph community and get updated data. This spreadsheet shows the behavior on Nautilus, Octopus, and the upcoming Pacific releases. The gist of it is that we’ve improved performance quite a bit and putting 2 OSDs on each NVMe drive isn’t necessarily a big gain the way it was in Nautilus.