On 08/06/2014 11:17 AM, Yuanzhen Gu wrote: >> Guest freeze/thaw (virDomainFSFreeze) only works on a live guest. So >> what you will have to do is: >> >> virDomainFSFreeze(vm1, ...) >> virDomainFSFreeze(vm2, ...) >> virDomainSuspend(vm1) >> virDomainSuspend(vm2) >> virDomainSnapshotCreateXML(vm1, ...) >> virDomainSnapshotCreateXML(vm2, ...) >> virDomainResume(vm1) >> virDomainResume(vm2) >> virDomainFSThaw(vm1, ...) >> virDOmainFSThaw(vm2, ...) >> > > I see, thanks. > >> >> However, I honestly don't know why you think you need disk snapshots >> from the same point in time across multiple VMs, though. > > > you suggested that external disk-only snapshot, libvirt will freeze/thaw > before/after taking snapshot For a single guest, yes, libvirt can handle both the freeze/thaw and any necessary pause/resume of the guest automatically. But as soon as you are coordinating multiple guests, it is up to you do to the coordination. Libvirt handles the case of taking a snapshot when the guest is already frozen and paused, but the burden of doing the three steps in parallel across VMs is now up to you instead of all three steps in a single API call for one VM. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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