> -----Original Message----- > From: Marty Sweet [mailto:msweet....@gmail.com] > Sent: Wednesday, August 14, 2013 4:47 AM > To: dev@cloudstack.apache.org > Subject: Re: snapshots in kvm > > Hi Sanjeev, > > As I understand it from a cloudstack prospective it will work per disk. > This error is returned because the KVM snapshot command (of which i can't > remember the name of at this time), takes control of the VM state because > the VM is paused while part of the copy is taking place. > > It may be worth looking into libvirt and KVM to see if multiple volumes can be > snapshot'ed at the same time and if so suggesting it through the appropriate > cloudstack channels to be an implemented feature, this would be something > I would be looking for and willing to implement if its possible on the > underlying hypervisor and the community agrees.
There are APIs to enable one disk per snapshot: http://libvirt.org/formatsnapshot.html disks On input, this is an optional listing of specific instructions for disk snapshots; it is needed when making a snapshot of only a subset of the disks associated with a domain, It says it's enabled since 0.9.5, but I haven't have time to test it yet. Patch is welcome. > > Marty > > On Wednesday, August 14, 2013, Sanjeev Neelarapu wrote: > > > Hi, > > > > This regarding snapshot process in KVM. Does libvirt allow creating > > snapshots on two disks of a vm at the same time? > > I have deployed a vm with root and data disk. Configured recurring > > snapshot policies on both root disk and data disk and snapshot process > > triggered on both the disks with difference of 1 sec. > > But one of them failed with libvirt exception: > > Failed to manage snapshot: org.libvirt.LibvirtException: Timed out > > during > > operation: cannot acquire state change lock > > > > Is this expected? If yes could you specify the reason for my understanding? > > > > Thanks, > > Sanjeev > >
