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

Solution Verified - Updated -

Issue

  • Why is my ceph cluster usage (ceph df or rados df output) lower than the total pools size?
  • When calculating the overhead usage on my cluster I am coming up with a negative number.
  • Ceph OSD total usage is less than overall pool size including replicas.

Environment

  • Red Hat Ceph 1.2.3
  • Red Hat Ceph 1.3
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Openstack
  • Copy-on-write Snapshotting

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