yes, I got your point, thanks very much Eric. If I want to take a distributed snapshot, which need pause all the VMs and then take snapshot, how can I control the pause for all the VMs?
Is there only way that I turn to freeze/thaw functions? and freeze/thaw only for file systems, not for the whole guest, am I right? Thanks a lot! Best, Yuanzhen On Wed, Aug 6, 2014 at 11:35 AM, Eric Blake <ebl...@redhat.com> wrote: > On 08/06/2014 08:36 AM, Yuanzhen Gu wrote: > > [please don't top-post on technical lists] > > > Thanks very much Eric! This is exactly what I guessed, I just wondering > > where I could find this piece of code and control the the pause time of > > guest, while the snapshot being taken? thanks ! > > Actually, for new enough qemu (one with the 'transaction' QMP command), > or for a guest where only one disk is being snapshotted, there is no > pause required. See qemuDomainSnapshotCreateDiskActiveExternal in > src/qemu/qemu_driver.c. When a pause is required, it is only for the > fraction of a second required to issue a followup qemu QMP command to > resume the guest, so there is no need for a knob to control the pause > time (it is as already as fast as possible). > > -- > Eric Blake eblake redhat com +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > >
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