Sorry, I just got on this list and am asking a number of questions… ☹
Nothing to be sorry for. We are a community and we were all new to Ceph at some point.
It was suggested in one of my other threads to create and apply a spec file that would have cephadm put the DB for rotational drives onto SSD when it creates the OSD on those drives. I came up with the following spec file:
Note that the 990 PRO appears to be a “client” model and may not be a good fit for enterprise duty cycle or workloads. The Kingston SSD specified below does look like an enterprise model rated at ~1 DWPD so you should be good to go with those.
--- START --- service_type: osd service_id: osd_spec_hdd placement: host_pattern: '*' data_devices: rotational: 1 db_devices: rotational: 0 model: 'Samsung SSD 990 PRO 1TB' limit: 1 --- service_type: osd service_id: osd_spec_ssd placement: host_pattern: '*' data_devices: model: 'KINGSTON SEDC1500M1920G' --- END ---