On 07/03/2012 06:42 AM, Jovanka Gulicoska wrote: > Hi, > > my name is Jovanka Gulicoska and I'm SoC student. I'm working on > implementing save/load of VM in Gnome-Boxes. > Something confused me about snapshots. In the documentation about life > cycle, in section about Save/Restore is said that domain saved with > virDomainSave/virDomainSaveFlags can be restored only once. Can you point out the URL to that documentation? It's slightly incorrect, and worth patching to make clearer if that would help the next person to read them. virDomainRestore can be used to restore a domain as many times as you want, _provided_ that before each restore, you _manually_ restore the disk state back to what it was at the time of the virDomainSave. virDomainManagedSave uses virDomainSave under the hood to create a save image which is then autoloaded at the next virDomainStart, but because it is auto-managed, it can only be restored once (on restoring a managedsave domain, the managed state is discarded). > But in the > documentation about Snapshot XML format there is no information about this > in VM state snapshots. virDomainSnapshotCreateXML is able to create a system checkpoint of both disk and RAM state at once, such that virDomainSnapshotRevert then restores disk state and memory state in one operation, instead of leaving the disk state to manual operation. > So is it better just to use virDomainSnapshotCreateXML instead of > virDomainSave/virDomainSaveFlags? It all depends on what your end goal is with doing a save/load of a VM. Do you need fast saves, or is it okay if the save takes several seconds? Will you be loading the state exactly once, or do you plan to make it something that the user can revert to multiple times in a row? > I've created bindings for this functions in libvirt-glib but I wanted to be > sure before I send them for review. > Feel free to ask more questions on the topic; I'll do my best to answer them. -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
Attachment:
signature.asc
Description: OpenPGP digital signature
-- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list