[ubuntu] 14.04 How to delete kvm snapshot

Hi,

I installed a new kvm setup this week based on ubuntu 14.04, just like my old setup, so the general setup worked fine and I could migrate the hosts over.
I never played with the snapshot feature before though, so I wanted to give it a shot... that didnt go quite as well.

The snapshot was created like this
virsh snapshot-create-as domain --disk-only --atomic --diskspec vda,file=/mnt/storage/snap --no-metadata
So now I have a snapshot at /mnt/storage/snap which I want to delete and commit back to the main file.

However the snapshot is not in "virsh snapshot-list domain"
I can run blockpull and until I upgraded libvirt to the one in ubuntu-cloud I could also start a commit
But I cant figure out how to actually delete the snapshot.

I tried to edit the xml file to just point to the original files, but that didnt work (claimed the ds file was not a qcow format).
I am ok with reverting the snapshot or merging it, theres not really any changes to be lost on the guest.

Any ideas is most welcome,
Thanks