Thanks for the help. That page had sort of the answer. I had tried "ceph osd crush tunables optimal" earlier but I got an error: "Error EINVAL: new crush map requires client version jewel but require_min_compat_client is firefly" The links for help on that page are dead, but I did end up finding this page. https://docs.ceph.com/docs/master/rados/operations/upmap/ I am not sure what upmap is, or the upmap trick, but i was able to resolve with the info on this page. First I ran "ceph features" and made sure all clients were listed as luminous. Second I ran "ceph osd set-require-min-compat-client luminous" Then I was able to successfully run "ceph osd crush tunables optimal" without error. My cluster is 19 total TiB theree was 54% objects misplaced. Took about 4 hours to re-balance. Cluster is not really being used much because of Covid and Sunday, so a good time to do it. HEALTH_OK :) Thanks again!