QEMU

The other day I needed to migrate a bunch of Openstack VMs (~1T of volumes) from openstack version ‘Stein’ to a brand new ‘Caracal’ platform. The former was using NFS based storage. The latter Ceph, obviously. Glance storage is still NFS mounted. So let’s try to migrate this the ‘Openstack way’. Turns out Openstack (Cinder) needed to copy the data 3 times! Download from glance to some temporary storage Convert the image to ‘raw’ format, even if the uploaded image is already ‘raw’....

oVirt supports this from the web interface but it is a very cumbersome and slow process. It also breaks often for obscure reasons in my experience. Using the SSH console, you can create your image directly on your backup server using NFS or whatever you are used to. I learned how to do this from this web resource: https://coderwall.com/p/ei2x4g/export-ovirt-vm-to-qcow2-image-file Figure out location disk images of your VM You first need to figure out wich logical volumes are associated with your VM....