Hi, My Ceph cluster is out-of-balance. The amount of PG's per OSD ranges from about 50 up to 100 PG's per OSD. This is far from balanced. Today, I have enabled the balancer module. But unfortunately, it doesn't want to balance: "Unable to find further optimization, or pool(s) pg_num is decreasing, or distribution is already perfect" The upmap_max_deviation setting was set to default (5). Changing this to 1, triggered the balancer module. It did 1 run, balanced a few PG's (less than 5 PG's in total), then again it got stuck with the same message: "Unable to find further optimization, or pool(s) pg_num is decreasing, or distribution is already perfect" I have about 280 OSD's: 24 OSD's per node, 4 nodes per rack, 3 racks in total. Replica = 3. 1 replica per rack. My disk sizes differs from 1.6T up to 2.4T. Any advice on this? Thanks! Sinan