I'll try it out again - last I tried it complanied about older clients -
it should be better now.
upmap is supported since kernel 4.13.
Second - should the reweights be set back to 1 then?
Yes, also:
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`.
k
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