Hello,
Can you provide more details how you performed the conversion and export? The size could
be due to it being thin provisioned.
I guess you could just take the vmdk image from VMware and convert it to qcow2 with
something like this:
qemu-img convert -p -f vmdk -O qcow2 testvm.vmdk testvm.qcow2
You then create a VM on ovirt with the same os type and try and attach the qcow2 file to
it. Chances are that the machine will boot and adapt :-)