OCS size - Raw Storage used much higher than actual usage in OCS - fstrim on Ceph RBD

Solution Verified - Updated -


  • How does OCS/ODF behaves when reporting storage usage?
  • Why is the "raw" storage usage so much higher than the actual storage usage?
  • Do I need to provision more storage?

On this document we provide command outputs from an OCS cluster of 3 nodes with one disk of 512GB (used by ceph osd) on each OCS node , that means ceph cluster will have 1.5TB of RAW size


  • Red Hat OpenShift Container Platform 4 (OCP)
  • Red Hat OpenShift Container Storage (OCS)
    • 4.8 and previous
  • Red Hat OpenShift Data Foundation (ODF)
    • 4.9 and later

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