On Sun, May 12, 2013 at 11:43:31PM -0000, Brian J. Murrell wrote: > On 13-05-12 05:14 PM, Michael Tokarev wrote: > > First, having a single qcow2 file open for read-write access by more > > than one process in unsupported. > > But I don't, if I understand how qcow2 snapshots work. Let me apologize > if I was not clear. Each of the VMs have their own snapshot of the > common "origin" qcow2 disk. If I understand correctly in such a > configuration, only one VM has each snapshot qcow2 open for read-write > access and they all have the "origin" open read-only, is that correct? > Surely that must be supported, yes?
$ qemu-img create -f qcow2 -b template.img vm001.qcow2 $ qemu-img create -f qcow2 -b template.img vm002.qcow2 $ qemu-img create -f qcow2 -b template.img vm003.qcow2 $ ...launch vm001-vm002... This is safe. The template.img backing file is open read-only. Did you do anything else? Stefan
