[one-users] with virt-manager, new VM instance of RAW format works, but new VM instance of qcow2 format doesn't work !!!

[Qiubo Su (David Su)]

dear opennebula community,

i run "VBoxManage clonehd --format RAW image.vdi image.img" to convert the
virtualbox .vdi vm instance to raw format, and with virt-manager to create
new vm with the raw format, it works fine, i.e. can start the new vm
instance successfully and the networking access is the same as before.

but after run "qemu-img convert -f raw image.img -O qcow2 image.qcow" to
convert the raw format to qcow2 format, and with virt-manager to create new
vm with the qcow2 format, it doesn't work, i.e. get "no bootable device"
error when start the new vm with qcow2 format, no need to say the
networking access.

the size of the ram format disk is about 40GB, while the size of the qcow2
format disk is about 1.3GB (similar as that of the original image.vdi
size), nearly 30 times smaller than the raw format.

if not convert the raw format to qcow2 format, then the disk size is too
large, waste of disk space.

there are ubuntu 12.04, opennebula 3.6.0, and kvm, qemu, libvirt etc
installed.

it is much appreciated if you can help with this.

thanks,
david su
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