On 12/04/2013 08:29 AM, Juraj Melo wrote: > Thanks for your answer, [please don't top-post on technical lists, and use proper in-reply-to headers to keep things properly threaded] > > I am trying to make a snapshot of whole virtual machine (disk, CPU > state, memory). But I need to make this snapshot in matter of seconds. This is possible using external snapshots with memory, present since libvirt 1.0.5. The overall operation takes as long as a migration to file, but the guest continues to operate throughout that phase. The actual guest downtime is a mere fraction of a second at the point where the disk snapshots are taken once the migration to file completed. virsh snapshot-create-as $dom $snapname --live --memspec /path/to/file will store the memory state into /path/to/file, and create an external disk snapshot of each disk (you may need to use the --diskspec option if you want to control the filenames of those disk snapshots). > > I have already try to create snapshot of disk, which is not problem. I > use qcow2 format, and create new disk image using original disk image as > backing file. But still I am not able to assign state of vm with new disk. > > I have found some commands for creating snapshots in libvirt API, so in > my opinion one way how to accomplish my task is to create utility using > theese commands, and create snapshot of vm in RAM - I hope it would be > faster. > > But I wonder whether virsh contains similar functionality, so I won't > need to programm it again. > Yes, virsh wraps the virDomainSnapshotCreateXML() API. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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