Hello, i want to test something with cephfs subvolume an how to mount it and set quota. after some "ceph fs" commands I got an E-Mail from Prometheus that the cluster is in "Health Warn". The Error was that every MDS crash with a Segfault. Following Some Information of my cluster. The cluster is running via podman. ceph version 16.2.3 (381b476cb3900f9a92eb95d03b4850b953cfd79a) pacific (stable) The commands I habe used to setup my subvolume. ceph fs subvolumegroup create cephfs test-mount # Size 10G ceph fs subvolume create cephfs test-mount-volume test-mount --size=1073741824 ceph fs subvolume info cephfs test-mount-volume test-mount # Failed ceph fs subvolume authorize cephfs test-mount-volume test-mount-client test-mount / # Success ceph fs subvolume authorize cephfs test-mount-volume test-mount-client test-mount Now i got from Prometheus a Health Warn Alert. The reason is MDS stuck in "replay" loop. No MDS come up anymore All MDS crashes with the following Error Message. # MDS Error Message replayed ESubtreeMap at 12471325829 subtree root 0x1 is not mine in cache (it's -2,-2) *** Caught signal (Segmentation fault) ** The journal looks like OK. cephfs-journal-tool --rank=cephfs:all journal inspect Overall journal integrity: OK I took a backup from the journal via. cephfs-journal-tool --rank=cephfs:all journal export backup.bin and an export from the cephfs_metadata pool. rados -p cephfs_metadata export cephfs_metadata_backup A short Output of the events. cephfs-journal-tool --rank=cephfs:all event get list https://pastebin.com/jUDTQL2U[1] I would take the following actions to recover the mds failure: cephfs-journal-tool --rank=cephfs:all event recover_dentries summary cephfs-journal-tool --rank=cephfs:all journal reset cephfs-table-tool --rank=cephfs:all reset session Any suggestions how to fix this? Thanks -- Carsten Feuls -------- [1] https://pastebin.com/jUDTQL2U