Dear All, After a unsuccessful upgrade to pacific, MDS were offline and could not get back on. Checked the MDS log and found below. See cluster info from below as well. Appreciate it if anyone can point me to the right direction. Thanks. MDS log: 2023-05-24T06:21:36.831+1000 7efe56e7d700 1 mds.0.cache.den(0x600 1005480d3b2) loaded already corrupt dentry: [dentry #0x100/stray0/1005480d3b2 [19ce,head] rep@0,-2.0<mailto:rep@0,-2.0> NULL (dversion lock) pv=0 v=2154265030 ino=(nil) state=0 0x556433addb80] -5> 2023-05-24T06:21:36.831+1000 7efe56e7d700 -1 mds.0.damage notify_dentry Damage to dentries in fragment * of ino 0x600is fatal because it is a system directory for this rank -4> 2023-05-24T06:21:36.831+1000 7efe56e7d700 5 mds.beacon.posco set_want_state: up:active -> down:damaged -3> 2023-05-24T06:21:36.831+1000 7efe56e7d700 5 mds.beacon.posco Sending beacon down:damaged seq 5339 -2> 2023-05-24T06:21:36.831+1000 7efe56e7d700 10 monclient: _send_mon_message to mon.ceph-3 at v2:10.120.0.146:3300/0 -1> 2023-05-24T06:21:37.659+1000 7efe60690700 5 mds.beacon.posco received beacon reply down:damaged seq 5339 rtt 0.827966 0> 2023-05-24T06:21:37.659+1000 7efe56e7d700 1 mds.posco respawn! Cluster info: root@ceph-1:~# ceph -s cluster: id: e2b93a76-2f97-4b34-8670-727d6ac72a64 health: HEALTH_ERR 1 filesystem is degraded 1 filesystem is offline 1 mds daemon damaged services: mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 26h) mgr: ceph-3(active, since 15h), standbys: ceph-1, ceph-2 mds: 0/1 daemons up, 3 standby osd: 135 osds: 133 up (since 10h), 133 in (since 2w) data: volumes: 0/1 healthy, 1 recovering; 1 damaged pools: 4 pools, 4161 pgs objects: 230.30M objects, 276 TiB usage: 836 TiB used, 460 TiB / 1.3 PiB avail pgs: 4138 active+clean 13 active+clean+scrubbing 10 active+clean+scrubbing+deep root@ceph-1:~# ceph health detail HEALTH_ERR 1 filesystem is degraded; 1 filesystem is offline; 1 mds daemon damaged [WRN] FS_DEGRADED: 1 filesystem is degraded fs cephfs is degraded [ERR] MDS_ALL_DOWN: 1 filesystem is offline fs cephfs is offline because no MDS is active for it. [ERR] MDS_DAMAGE: 1 mds daemon damaged fs cephfs mds.0 is damaged Justin Li Senior Technical Officer School of Information Technology Faculty of Science, Engineering and Built Environment Request for assistance can be lodged to the SIT Technical Team using this form<https://deakinesmprod.service-now.com/esc?id=sc_cat_item&sys_id=7afa8fa5db62e9101acbdbf2f39619a7> Deakin University Melbourne Burwood Campus, 221 Burwood Highway, Burwood, VIC 3125 +61 3 9246 8932 justin.li@deakin.edu.au<mailto:justin.li@deakin.edu.au> http://www.deakin.edu.au<http://www.deakin.edu.au/> Deakin University CRICOS Provider Code 00113B Important Notice: The contents of this email are intended solely for the named addressee and are confidential; any unauthorised use, reproduction or storage of the contents is expressly prohibited. If you have received this email in error, please delete it and any attachments immediately and advise the sender by return email or telephone. Deakin University does not warrant that this email and any attachments are error or virus free. Important Notice: The contents of this email are intended solely for the named addressee and are confidential; any unauthorised use, reproduction or storage of the contents is expressly prohibited. If you have received this email in error, please delete it and any attachments immediately and advise the sender by return email or telephone. Deakin University does not warrant that this email and any attachments are error or virus free.