I am running a KVM server (Ubuntu 14.04) and would like to take snapshots of my guests. I was reading how about how to do that in this article. It seemed as if I should be able to take a snapshot of a guest by running the following command:
sudo virsh snapshot-create $GUEST_ID /path/to/snapshot/file.xml
When I tried that (and also tried without specifying a filepath), I got the following error message:
error: unsupported configuration: internal snapshot for disk vda unsupported for storage type raw
When I created my guests, I used the following command to pre-create the disk images:
qemu-img create -f qcow2 -o preallocation=metadata,lazy_refcounts=on $filepath 20G
When I used the command sudo virsh edit $GUEST_ID
to see the definition of the guest, it clearly showed "raw" as shown below:
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/home/$USER/kvm/domain.name.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</disk>
Is it possible that I am not actually running qcow2 disk images, or did I enter the command for a snapshot incorrectly? Is there a way I can test to make sure whether my disk images are in a raw or qcow2 format using the CLI only?