On 12/04/2013 04:44 PM, Eric Blake wrote: > 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). A simple test of what Eric described is here: http://kashyapc.fedorapeople.org/virt/external-system-checkpoint-snapshot.txt > >> >> 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. > > > > _______________________________________________ > libvirt-users mailing list > libvirt-users@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/libvirt-users > -- /kashyap _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
