Dear fellow cephers, today we observed a somewhat worrisome inconsistency on our ceph fs. A file created on one host showed up as 0 length on all other hosts: [user1@host1 h2lib]$ ls -lh total 37M -rw-rw---- 1 user1 user1 12K Nov 1 11:59 dll_wrapper.py [user2@host2 h2lib]# ls -l total 34 -rw-rw----. 1 user1 user1 0 Nov 1 11:59 dll_wrapper.py [user1@host1 h2lib]$ cp dll_wrapper.py dll_wrapper.py.test [user1@host1 h2lib]$ ls -l total 37199 -rw-rw---- 1 user1 user1 11641 Nov 1 11:59 dll_wrapper.py -rw-rw---- 1 user1 user1 11641 Nov 1 13:10 dll_wrapper.py.test [user2@host2 h2lib]# ls -l total 45 -rw-rw----. 1 user1 user1 0 Nov 1 11:59 dll_wrapper.py -rw-rw----. 1 user1 user1 11641 Nov 1 13:10 dll_wrapper.py.test Executing a sync on all these hosts did not help. However, deleting the problematic file and replacing it with a copy seemed to work around the issue. We saw this with ceph kclients of different versions, it seems to be on the MDS side. How can this happen and how dangerous is it? ceph fs status (showing ceph version): # ceph fs status con-fs2 - 1662 clients ======= RANK STATE MDS ACTIVITY DNS INOS 0 active ceph-15 Reqs: 14 /s 2307k 2278k 1 active ceph-11 Reqs: 159 /s 4208k 4203k 2 active ceph-17 Reqs: 3 /s 4533k 4501k 3 active ceph-24 Reqs: 3 /s 4593k 4300k 4 active ceph-14 Reqs: 1 /s 4228k 4226k 5 active ceph-13 Reqs: 5 /s 1994k 1782k 6 active ceph-16 Reqs: 8 /s 5022k 4841k 7 active ceph-23 Reqs: 9 /s 4140k 4116k POOL TYPE USED AVAIL con-fs2-meta1 metadata 2177G 7085G con-fs2-meta2 data 0 7085G con-fs2-data data 1242T 4233T con-fs2-data-ec-ssd data 706G 22.1T con-fs2-data2 data 3409T 3848T STANDBY MDS ceph-10 ceph-08 ceph-09 ceph-12 MDS version: ceph version 15.2.17 (8a82819d84cf884bd39c17e3236e0632ac146dc4) octopus (stable) There is no health issue: # ceph status cluster: id: abc health: HEALTH_WARN 3 pgs not deep-scrubbed in time services: mon: 5 daemons, quorum ceph-01,ceph-02,ceph-03,ceph-25,ceph-26 (age 9w) mgr: ceph-25(active, since 7w), standbys: ceph-26, ceph-01, ceph-03, ceph-02 mds: con-fs2:8 4 up:standby 8 up:active osd: 1284 osds: 1279 up (since 2d), 1279 in (since 5d) task status: data: pools: 14 pools, 25065 pgs objects: 2.20G objects, 3.9 PiB usage: 4.9 PiB used, 8.2 PiB / 13 PiB avail pgs: 25039 active+clean 26 active+clean+scrubbing+deep io: client: 799 MiB/s rd, 55 MiB/s wr, 3.12k op/s rd, 1.82k op/s wr The inconsistency seems undiagnosed, I couldn't find anything interesting in the cluster log. What should I look for and where? I moved the folder to another location for diagnosis. Unfortunately, I don't have 2 clients any more showing different numbers, I see a 0 length now everywhere for the moved folder. I'm pretty sure though that the file still is non-zero length. Thanks for any pointers. ================= Frank Schilder AIT Risø Campus Bygning 109, rum S14