Hi I have recently onboarded new OSDs into my Ceph Cluster. Previously, I had 44 OSDs of 1.7TiB each and was using it for about a year. About 1 year ago, we onboarded an additional 20 OSDs of 14TiB each. However I observed that many of the data were still being written onto the original 1.7TiB OSDs instead of the 14TiB ones. Overtime, this caused a bottleneck as the 1.7TiB OSDs reached nearfull capacity. I have tried to perform a reweight (both crush reweight and reweight) to reduce the number of PGs on each 1.7TiB. This worked temporarily but resulted in many objects being misplaced and PGs being in a Warning state. Subsequently I have also tried using crush-compat balancer mode instead of upmap but did not see significant improvement. The latest changes I made was to change backfill-threshold to 0.85, hoping that PGs will no longer be assigned to OSDs that are >85% utilization. However, this did not change the situation much as I see many OSDs above >85% utilization today. Attached is a report from ceph report command. For now I have OUT-ed two of my OSDs which have reached 95% capacity. I would greatly appreciate it if someone can provide advice on this matter. Thanks Jasper Tan -- -- -- *The contents of this e-mail message and any attachments are confidential and are intended solely for addressee. The information may also be legally privileged. This transmission is sent in trust, for the sole purpose of delivery to the intended recipient. If you have received this transmission in error, any use, reproduction or dissemination of this transmission is strictly prohibited. If you are not the intended recipient, please immediately NOTIFY the sender by reply e-mail or phone and DELETE this message and its attachments, if any.*