Rbd cp empty block

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Hi all:

I have a 30G rbd block device as virtual machine disk, Aleady installed ubuntu 12.04. About 1G space used.

When I want to deploy vm, I made a "rbd cp". Then problem came, it copy 30G data instead of 1G. And this action take lots of time.

Any ideal? I just want make it faster to deploy vm.

--
OPS 王根意
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