On Thu, Jun 16, 2011 at 6:41 AM, Eric Blake <eblake@xxxxxxxxxx> wrote: > Right now, libvirt has a snapshot API via virDomainSnapshotCreateXML, > but for qemu domains, it only works if all the guest disk images are > qcow2, and qemu rather than libvirt does all the work. However, it has > a couple of drawbacks: it is inherently tied to domains (there is no way > to manage snapshots of storage volumes not tied to a domain, even though > libvirt does that for qcow2 images associated with offline qemu domains > by using the qemu-img application). And it necessarily operates on all > of the images associated with a domain in parallel - if any disk image > is not qcow2, the snapshot fails, and there is no way to select a subset > of disks to save. However, it works on both active (disk and memory > state) and inactive domains (just disk state). Hi Eric, Any updates on your proposed snapshot API enhancements? The use case I am particularly interested in is a backup solution using libvirt snapshot APIs to take consistent backups of guests. The two workflows are reading out full snapshots of disk images (full backup) and reading only those blocks that have changed since the last backup (incremental backup). Incremental backups can be done just like full backups except with an API call to get a dirty blocks list. The client only reads out those dirty blocks from the snapshot. Stefan -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list