Hello, We have a 3 geo locational freshly installed multisite setup with an upgraded octopus from 15.2.5 to 15.2.7. We have 6 osd nodes, 3 mon/mgr/rgw in each dc, full SSD, 3 ssd is using 1 nvme for journaling. Each zone backed with 3 RGW, one on each mon/mgr node. The goal is to replicate 2 (currently) big buckets in the zonegroup but it only works if I disable and reenable the bucket sync. Big buckets means, one bucket is presharded for 9000 shards (9 billions objects), the 2nd bucket that I'm detailing in this ticket 24000 (24 billions objects) shards. Once picked up the objects (not all, only the ones that was on the source site at that given time when it was enabled) it will slows down a lot from 100.000 objects / 15 minutes in and 10GB/15 minutes to 50 objects/4 hours. Once it synchronized after enabled/disabled, it maxing out the osd nodes with NVME/SSD drives with some operation which I don't know what is it. Let me show you the symptoms below. Let me summarize as much as I can. We have 1 realm, in this realm we have 1 zonegroup (please help me to check if the sync policies are ok) and in this zonegroup we have 1 cluster in US, 1 in Hong Kong (master) and 1 in Singapore. Here is the realm, zonegroup and zones definition: https://pastebin.com/raw/pu66tqcf Let me show you one enable/disable operation when I've disabled on the HKG master site the pix-bucket and enabled it. In this screenshot: https://i.ibb.co/WNC0gNQ/6nodes6day.png the highlighted area is when the data sync is running after disable enable. You can see almost no operation. You can see also when sync is not running, the green and yellow is the NVME drive rocksdb+wal drives. The screenshot represents the 6 Singapore nodes SSD/NVME disk utilizations. The first node you can see in the last hours no green and yellow, it's because I've reinstalled in that nodes all the osds to not use NVME. In the following 1st screenshot you can see the HKG object usage where the user is uploading the objects. 2nd screenshot the SGP one where you can see the highlighted area is the disable/enable operation. HKG where user upload: https://i.ibb.co/vj2VFYP/pixhkg6d.png SGP where sync happened: https://i.ibb.co/w41rmQT/pixsgp6d.png Let me show you some troubleshooting logs regarding bucket sync status, cluster sync status, reshard list (which might be because of previous testing), sync error list https://pastebin.com/raw/TdwiZFC1 The issue might be very similar to this issue: https://tracker.ceph.com/issues/21591 Where I should move forward or how can I help you to provide more logs to help me please? Thank you in advance ________________________________ This message is confidential and is for the sole use of the intended recipient(s). It may also be privileged or otherwise protected by copyright or other legal rules. If you have received it by mistake please let us know by reply email and delete it from your system. It is prohibited to copy this message or disclose its content to anyone. Any confidentiality or privilege is not waived or lost by any mistaken delivery or unauthorized disclosure of the message. All messages sent to and from Agoda may be monitored to ensure compliance with company policies, to protect the company's interests and to remove potential malware. Electronic messages may be intercepted, amended, lost or deleted, or contain viruses.