Hi, I've recently upgraded from squid 19.2.3 to tentacle 20.2.0 on our 10 Alma 9.6 machines and first everything was good. When I enabled the EC optimizations via ceph osd pool set submit_ec_hdd allow_ec_optimizations true Errors started to appear, basically after each scrubbing, like these: HEALTH_ERR 88909311 scrub errors; Possible data damage: 117 pgs inconsistent [ERR] OSD_SCRUB_ERRORS: 88909311 scrub errors [ERR] PG_DAMAGED: Possible data damage: 117 pgs inconsistent and I was unable repairing them. Some errors disappear after restarting all osd daemons but they come back after another scrubbing. When running "rados list-inconsistent-obj <PG>" on some PGs I get errors like these: {"osd":62,"primary":false,"shard":4,"errors":["size_mismatch_info","obj_size_info_mismatch"],"size":700416,"object_info":{"oid":{"oid":"1000793c33a.000000dd","key":"","snapid":-2,"hash":2213519396,"max":0,"pool":4,"namespace":""},"version":"43143'3253925","prior_version":"0'0","last_reqid":"client.1822828.0:160762343","user_version":3253925,"size":4194304,"mtime":"2025-11-10T22:13:15.257031-0500","local_mtime":"2025-11-10T22:14:44.294560-0500","lost":0,"flags":["dirty","data_digest"],"truncate_seq":0,"truncate_size":0,"data_digest":"0x7e22aafe","omap_digest":"0xffffffff","expected_object_size":0,"expected_write_size":0,"alloc_hint_flags":0,"manifest":{"type":0},"watchers":{}}},{"osd":65,"primary":false,"shard":3,"errors":[],"size":700416} So it looks like there is some size mismatch. I don't have any indication that data is lost so far. But the cluster is under pressure and daemons crash, so it's in a critical state. OSDs crash with errors like [ERR] : 4.cc shard 63(5) soid 4:33394f7f:::10001e60e03.00000000:head : candidate size 311296 info size 307200 mismatch [ERR] : 4.cc shard 63(5) soid 4:33394f7f:::10001e60e03.00000000:head : candidate size 311296 info size 307200 mismatch ... again, there is some size mismatch. I'm pretty sure this is the same error than what was mentioned in this thread: https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/F3JYHK4INKS6... But there has been no reply yet. Does anyone have an idea what can be done to solve this? Or what I can try to get more information? We don't have copies of most of the data and it would be bad if we loose some. Best regards and many thanks for your help, David