On Mon, May 13, 2013 at 10:46:55PM +0100, Richard W.M. Jones wrote: > On Mon, May 13, 2013 at 01:50:00PM -0400, Wolfgang Richter wrote: > > Paolo/anyone who knows - > > > > Are drive-mirror sync points (NBD flush commands) reflecting guest write > > barriers? Are guest write barriers respected by drive-mirror? If so, that > > would make drive-mirror much more palatable for disk introspection work (a > > drop-in usable feature of QEMU!). > > I'm also interested in this question. Further extensions to this > (*not* drive-mirror on its own AIUI) which stefanha is working on > should allow libguestfs to perform point-in-time snapshots of images, > which will mean that we can do complex and long-running inspection > operations on live guests.
OK, I got my attributions wrong there. I see that Dietmar Maurer wrote the original version of the patch and Stefan modified that. Anyway I'm very interested in point-in-time snapshots. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#)