[Libguestfs] Why is virt-resize designed to involve two disks?

[吴志勇]

HI,
As you've known, vhd-util and qemu-img both provide the capacity for resizing the original disk, but why is virt-resize designed to involve two disks, not only original disk? Is there any concern? Is it possible that only one original disk is involved in virt-resize?

-- 
Regards,
 
Zhi Yong Wu
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