Qemu-img resize

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qemu-img resize image_name.qcow2 +3G
image resized.
Verify: 

qemu-img info image_name.qcow2
image: image_name.qcow2
file format: qcow2
virtual size: 500G (536870912000 bytes)
disk size: 246G
cluster_size: 65536 
Format specific information:
   compat: 1.1
   lazy refcounts: true
   refcount bits: 16
   corrupt: false
qemu-img resize YOUR_VM_MACHINE_NAME.img -10G
qemu-img: warning: Shrinking an image will delete all data beyond the shrunken image's end. Before performing such an operation, make sure there is no important data there.
qemu-img: Use the --shrink option to perform a shrink operation


Process:


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