The distribution of data among OSD's is uneven, Why?

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Issue

The distribution of data among OSD's is uneven, Why?
Why is the OSD filesystem utilization not balanced among the OSD nodes?
ceph osd df imbalance
reweight-by-utilization for OSD imbalance issue or tweaking crush is needed
Adavnce CRUSH profile to hammer
nearfull warings and balancing CRUSH map

Environment

Red Hat Ceph Storage 1.3.x
Red Hat Ceph Storage 2.x

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