Hello, On our 16.2.14 CephFS cluster, all OSDs are spamming logs with messages like "log_channel(cluster) log [DBG] : xxx scrub starts". All OSDs are concerned, for different PGs. Cluster is healthy without any recovery ops. For a single PG, we can have hundreds of scrub starts msg in less than an hour. With 720 OSDs (8k PG, EC8+2), it can lead to millions of messages by hour... For example with PG 3.1d57 or||3.1988 : |Aug 31 16:02:09 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:09.453+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:11 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:11.446+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:12 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:12.428+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:13 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:13.456+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:14 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:14.431+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:15 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:15.475+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:21 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:21.516+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:23 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:23.555+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 scrub starts|| ||Aug 31 16:02:24 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-58[1310188]: debug 2023-08-31T14:02:24.510+0000 7fdab1ec4700 0 log_channel(cluster) log [DBG] : 3.1d57 deep-scrub starts|| Aug 31 16:02:10 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-276[1325507]: debug 2023-08-31T14:02:10.384+0000 7f0606ce3700 0 log_channel(cluster) log [DBG] : 3.1988 deep-scrub starts Aug 31 16:02:11 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-276[1325507]: debug 2023-08-31T14:02:11.377+0000 7f0606ce3700 0 log_channel(cluster) log [DBG] : 3.1988 scrub starts Aug 31 16:02:13 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-276[1325507]: debug 2023-08-31T14:02:13.383+0000 7f0606ce3700 0 log_channel(cluster) log [DBG] : 3.1988 scrub starts Aug 31 16:02:15 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-276[1325507]: debug 2023-08-31T14:02:15.383+0000 7f0606ce3700 0 log_channel(cluster) log [DBG] : 3.1988 deep-scrub starts Aug 31 16:02:17 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-276[1325507]: debug 2023-08-31T14:02:17.336+0000 7f0606ce3700 0 log_channel(cluster) log [DBG] : 3.1988 scrub starts Aug 31 16:02:19 ceph-86cd8a68-7649-11ed-b2be-5cba2c7fdb30-osd-276[1325507]: debug 2023-08-31T14:02:19.328+0000 7f0606ce3700 0 log_channel(cluster) log [DBG] : 3.1988 scrub starts || ||PG_STAT OBJECTS MISSING_ON_PRIMARY DEGRADED MISPLACED UNFOUND BYTES OMAP_BYTES* OMAP_KEYS* LOG DISK_LOG STATE STATE_STAMP VERSION REPORTED UP UP_PRIMARY ACTING ACTING_PRIMARY LAST_SCRUB SCRUB_STAMP LAST_DEEP_SCRUB DEEP_SCRUB_STAMP SNAPTRIMQ_LEN|| ||3.1d57 52757 0 0 0 0 167596026648 0 0 1799 1799 active+clean 2023-08-31T14:27:24.025755+0000 236010'4532653 236011:8745383 [58,421,335,9,59,199,390,481,425,480] 58 [58,421,335,9,59,199,390,481,425,480] 58 231791'4531915 *2023-08-29T22:41:12.266874+0000* 229377'4526369 *2023-08-26T04:30:42.894505+0000* 0| |3.1988 52867 0 0 0 0 168603872808 0 0 1811 1811 active+clean 2023-08-31T14:32:13.361420+0000 236018'4241611 236018:9815753 [276,342,345,299,210,349,85,481,446,46] 276 [276,342,345,299,210,349,85,481,446,46] 276 236012'4241602 *2023-08-31T14:32:13.361343+0000* 228157'4229095 *2023-08-24T05:59:16.573471+0000*| However scrub is working fine, scrub stamp looks OK (2023-08-29 or 2023-08-31) as we have default value for scrub interval (min 24h / max 7days). I tried to play with scrub parameters like osd_scrub_load_threshold (->20), osd_max_scrubs (->3), osd_scrub_*_interval but nothing better. Any idea what's going on and how to fix this? Cheers, Adrien ||