Hi,Storing the image as an object with RADOS or RGW will result as a single big object stored somewhere in Ceph. However with RBD the image is spread across thousands of objects across the entire cluster. At the end, you get way more performance by using RBD since you intensively use the entire cluster, with the object solution you only request one big object from a single machine so you get less performance.
AFAIK using RGW or RBD should be the same as object placement on cluster.
RGW is only a REST gateway for librados, so an object created by RGW should be spreaded across cluster as for RBD and CephFS......
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