Default data to rbd that never written

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Hello,

       I created an rbd image and wrote some data to it. After that, I cloned a new image from the previous one.

Then I compared this two image byte by byte, but they are not totally equal. The data in position where I never wrote to the first image are not equal.

       Is this a normal case or a bug? If this is normal, is there any configuration can help me to set rbd default data to all zero?

 

Ceph version: 14.2.5

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