[sheepdog-users] how about the data relastionship with snapshot and clone

Liu Yuan namei.unix at gmail.com
Fri Jan 3 08:57:06 CET 2014

On Tue, Dec 31, 2013 at 06:24:13PM +0800, redtone wrote:
> OS Provision with snapshot and clone
> 1, dog vdi create windows2003
> 2, install windows 2003 on the vdi disk
> 3, dog vdi snapshot -s osbase windows2003
> 4, dog vdi clone -s osbase windows2003 kvm01_os
> 5, running VM on kvm01_os 
> 6, dog vdi delete -s osbase windows2003
> I wander if the the VM on kvm01_os will crashed because I delete the
> snapshot osbase, because the kvm01_os is cloned from the osbase snapshot.
> In fact the VM on kvm01_os will not crash when I delete the snapshot osbase.
> I am not sure about this. I think this is not safe. Anyone can clear it?

Currently, we make a very simple reference count on the objects in the
snapshot/clone chain, that is: don't delete objects if there is any outstanding

So in your case, you just delete the base image but not its data because its
data are referenced by other vdis.


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