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upmap is supported since kernel 4.13.I'll try it out again - last I tried it complanied about older clients - it should be better now.
Yes, also:Second - should the reweights be set back to 1 then? 1. `ceph osd crush tunables optimal` 2. All your buckets should be straw2, but in case `ceph osd crush set-all-straw-buckets-to-straw2` 3. Your hosts imbalanced: elefant & capone have only eight 10TB's, another hosts - 12. So I recommend replace 8TB's spinners to 10TB or just shuffle it between hosts, like 2x8TB+10x10Tb. 4. Revert all your reweights. 5. Balancer do his work: `ceph balancer mode upmap`, `ceph balancer on`.
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