Why is my ceph cluster usage (ceph df or rados df output) higher than the total pools size ?

Solution Verified - Updated -

Issue

  • Why is my ceph cluster usage (ceph df or rados df output) higher than the total pools size ?
  • I want to understand OSD disk usage
  • Ceph OSD total usage shows me 15TB, but when I calculate by individual pools size, overall size is coming up to 11TB including replicas on pools. I want want to understand where the other 4Tb is getting used.

Environment

  • Red Hat Ceph Storage 1.2.3

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