i am learning ceph,block storage and read that each object size is 4 Mb.I am not clear about the concepts of object storage still what will happen if the actual size of data written to block is less than 4 Mb lets say 1 Mb.Will it still create object with 4 mb size and keep the rest of the space free and unusable?
No, it will only take up as much space as you write (plus some metadata). Although I think RBD passes down io hints suggesting the object's final size will be 4MB so that the underlying storage (eg xfs) can prevent fragmentation.
-Greg
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