[CentOS-virt] Confused by "qemu-img convert"

Hi All,

Okay. Now I am confused.

I have a bunch of virtual machines running under Virtual Box 3.2.12. I want to run them under KVM and drop Virtual Box from these systems.

Supposedly "qemu-img convert" now supports direct conversion from vdi to whatever KVM uses. So I fired up the man page and got really confused. Then I fired up Google and got worse confused.

Might I impose on some kind individual to write down a sample run string that would show me how to do this?

Many thanks, -T

Is it as easy as?

qemu-img convert -f vdi oldImage.vdi -O qcow2 newImage.qcow

Do I need a ton of disk space to go to a full hard drive then back to a small virtual hard drive?

Do I need the Virtual Box XML file for anything or just the VDI?

Many thanks, -T