Hi With the help of Dan van der Steri i managed to confirm my suspicions that the problem with osdmap not trimming correctly was caused by PGs that somehow wasn't marked as created by MONs. For example, from log: 2020-11-16 12:57:00.514 7f131496f700 10 mon.monb01@0(probing).osd e72792 update_creating_pgs will instruct osd.265 to create 28.3ff@67698 2020-11-16 12:57:25.982 7f1315971700 10 mon.monb01@0(leader).osd e72792 update_creating_pgs will instruct osd.265 to create 28.3ff@72792 But: root@monb01:/var/log/ceph# ceph pg dump |grep 28.3ff dumped all 28.3ff 3841 0 0 0 0 15970230272 0 0 3028 3028 active+clean 2020-11-16 05:38:27.338826 72792'87928 72792:335764 [265,277,282] 265 [265,277,282] 265 72792'85741 2020-11-16 05:38:27.338783 72588'79082 2020-11-10 18:42:43.182436 0 root@monb01:/var/log/ceph# root@monb01:/var/log/ceph# ceph health detail HEALTH_OK root@monb01:/var/log/ceph# Does anyone know how to fix this? I found that it can be cleared by deleting and recreating that pool, but there's a lot of data there so is there way to fix this some other way? -- Best regards Marcin