Hello Cephers, Since I didn't have any progress on my side, I share again my problem, hoping for some clues. --- Since I was not confident in my replication status, I've done a radosgw sync init one after the other, in both of my zones. Since then, there art stale recovering shards. Incremental replication seems OK. Cluster A sync status: realm 421c9bbd-83cc-4d85-a25a-ca847f225bfe (R) zonegroup 2c5ccf52-88be-4b2f-b4b9-c55f73bbacd1 (ZG) zone 3e3b0a2b-1864-4923-93a6-237a13b51594 (Z1) current time 2025-02-06T19:03:10Z zonegroup features enabled: resharding disabled: compress-encrypted metadata sync no sync (zone is master) data sync source: aefd4003-1866-4b16-b1b3-2f308075cd1c (Z2) syncing full sync: 0/128 shards incremental sync: 128/128 shards data is behind on 3 shards behind shards: [65,66,77] oldest incremental change not applied: 2025-02-06T20:02:53.441838+0100 [66] 111 shards are recovering recovering shards: [0,1,2,3,4,5,6,7,8,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53, 54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101, 102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127] Cluster B sync status: realm 421c9bbd-83cc-4d85-a25a-ca847f225bfe (R) zonegroup 2c5ccf52-88be-4b2f-b4b9-c55f73bbacd1 (ZG) zone aefd4003-1866-4b16-b1b3-2f308075cd1c (Z2) current time 2025-02-06T19:03:37Z zonegroup features enabled: resharding disabled: compress-encrypted metadata sync syncing full sync: 0/64 shards incremental sync: 64/64 shards metadata is caught up with master data sync source: 3e3b0a2b-1864-4923-93a6-237a13b51594 (Z1) syncing full sync: 0/128 shards incremental sync: 128/128 shards data is behind on 7 shards behind shards: [58,59,60,62,64,66,67] oldest incremental change not applied: 2025-02-06T20:03:27.831651+0100 [60] 81 shards are recovering recovering shards: [0,1,2,3,4,5,6,7,8,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53, 54,57,58,59,60,61,62,63,64,65,66,67,68,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123 ,124,126,127] Restarting full sync does nothing, except eventually adding recovering shards ! I also have some large omap objects in Z1.rgw.log pool. Where I see a lot of objects with names beginning by bucket.sync-status.*. What can I do to remove those recovering shards ? Some trimming (bilog ?), deleting objects in Z1.rgw.log pool ? I have some errors in radosgw-admin sync error list, but not really usefull : failed to sync bucket instance: (125) Operation canceled => A racing condition exists between writes to the same RADOS object. I also tried to rewrite all objects in buckets listed in thoses errors, with minimal size=0. Nothing changed. Thank you for reading. Regards, -- Gilles