RBD Object-Map Usuage incorrect

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Due to the recent 5.3.x kernel having support for Object-Map and other features required in KRBD I have now enabled object-map,fast-diff on some RBD images with CEPH (14.2.5), I have rebuilt the object map using "rbd object-map rebuild"

However for some RBD images, the Provisioned/Total Provisioned then listed in the Ceph MGR for some images is the full RBD size and not the true size reflected in a VM using df -h, I have discard enabled and have run fstrim but I know that for example a 20TB RBD has never gone above the current 9TB shown in df -h but in CEPH MGR shows as 20TB under Provisioned/Total Provisioned.

Not sure if I am hitting a bug? Or if this is expected behavior?

Thanks



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