Re: [libvirt] [Qemu-devel] qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions

On 11/11/2011 12:15 PM, Kevin Wolf wrote: > Am 10.11.2011 22:30, schrieb Anthony Liguori: > > Live migration with qcow2 or any other image format is just not going to work > > right now even with proper clustered storage. I think doing a block level flush > > cache interface and letting block devices decide how to do it is the best approach. > > I would really prefer reusing the existing open/close code. It means > less (duplicated) code, is existing code that is well tested and doesn't > make migration much of a special case. > > If you want to avoid reopening the file on the OS level, we can reopen > only the topmost layer (i.e. the format, but not the protocol) for now > and in 1.1 we can use bdrv_reopen(). > Intuitively I dislike _reopen style interfaces. If the second open yields different results from the first, does it invalidate any computations in between? What's wrong with just delaying the open?