Data distribution among OSD's is uneven

Solution Verified - Updated -

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
  • Advance CRUSH profile to hammer
  • nearfull warnings and balancing CRUSH map

Environment

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

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