[Qemu-discuss] qemu-img convert will increase the VM image

[xuanmao_001]

Hi, all:

 

I have question about qemu-img convert ...

 

I have a orignal image with following information:

# qemu-img info ori.qcow2       

image: ori.qcow2

file format: qcow2

virtual size: 2.0G (2097152000 bytes)

disk size: 308M

cluster_size: 65536

 

when I executed with "qemu-img convert -f qcow2 -O qcow2 ori.qcow2 new.qcow2"

the new.qcow2 like following:

# qemu-img info new.qcow2 

image: new.qcow2

file format: qcow2

virtual size: 2.0G (2097152000 bytes)

disk size: 748M

cluster_size: 65536

 

so, my question is why the image size increased after my operation?

 

thanks.

 

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xuanmao_001