Hi all, Ceph Nautilus 14.2.16. We encounter a strange and critical poblem since this morning. Our cephfs metadata pool suddenly grew from 2,7% to 100%! (in less than 5 hours) while there is no significant activities on the OSD data ! Here are some numbers: # ceph df RAW STORAGE: CLASS SIZE AVAIL USED RAW USED %RAW USED hdd 205 TiB 103 TiB 102 TiB 102 TiB 49.68 nvme 4.4 TiB 2.2 TiB 2.1 TiB 2.2 TiB 49.63 TOTAL 210 TiB 105 TiB 104 TiB 104 TiB 49.68 POOLS: POOL ID PGS STORED OBJECTS USED %USED MAX AVAIL cephfs_data_home 7 512 11 TiB 22.58M 11 TiB 18.31 17 TiB cephfs_metadata_home 8 128 724 GiB 2.32M 724 GiB 100.00 0 B rbd_backup_vms 9 1024 19 TiB 5.00M 19 TiB 37.08 11 TiB The cephfs_data uses less than the half of the storage space, and there was no significant increase during the period (and before) where metadata became full. Is someone already encounter that ? Currently, I have no idea how I can solve this problem. The restart of associated OSD and mds services have not been useful. Let me know if you want more informations or logs. Thank you for your help. Regards, Hervé