Hello, I use Ceph as the storage backend for Nova, Glance, and Cinder. If I create a snapshot for a instance, It create a new image in glance. And I can use the image to create a new instance. This feels to me more like creating an image based on the current state of the VM rather than creating a VM snapshot. I want to ask: 1、Can I create and revert a VM snapshot like I would in virtual machine software? 2、When a VM uses multiple disks/volumes, does OpenStack support taking a snapshot of all disks/volumes of the VM as a whole? 3、Can OpenStack snapshot and save the memory state of a VM? If it is not currently supported, are there any simple customization implementation ideas that can be recommended? Thank you for any help and suggestions. Best wishes. Han