On 02/13/2011 02:30 PM, Nataraj wrote: > On 02/13/2011 10:21 AM, Dennis Jacobfeuerborn wrote: >>> Could you then pause the virtual machine and safely take an LVM >>> snapshot, continue the VM and then mount the snapshot on the host and do >>> a backup? >> Probably not. If you pause the guest then the filesystem on it might be in >> an inconsistent state. You will be able to make a snapshot since that >> happens on the block level but you might have problems mounting it. >> >> Regards, >> Dennis > I've heard of somebody doing something to make this work. I think you > could create another LV (from inside the VM - assuming a linux VM) on > top of whatever raw partition was available to the VM. Then you could > take the snapshot within the VM (which I believe guarantees that the > filesystem is sync'ed when the snapshot is taken.) Then you use losetup > and lvscan to make the lvm vg available on the host and I think you > could access the snapshot without even pausing the vm. > > > Nataraj I guess this is not the case. You can attach the VM virtual disk to the loopback and see the VG and it's LV's, but they show up as unavailable. I guess changing the snapshot to be available would be writing to the LV structure and could cause corruption while the vm is running, so better not.
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