What does OMAP and META in 'ceph osd df' output means?

Solution Verified - Updated -

Issue

  • What is OMAP and META value for the OSDs in 'ceph osd df' output? How is it calculated?
  • Why does META values on OSDs shows Gigabytes in size even though all data is deleted from cluster?

Environment

  • Red Hat Ceph Storage 3.3.z1 and above

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