On 11/02/2012 04:30 AM, Stefan Hajnoczi wrote: > II. If you want to use internal snapshots in a single qcow2 file, you > will need to modify QEMU code more: > 1. Implement BlockDriverState snapshot slave support so a qcow2 > snapshot can be read-only accessed as a BlockDriverState while the > master BlockDriverState for the image still writes into the image > file. This is mainly qcow2 refactoring and block.c glue code.
You are not the first to request this - libvirt would also like the ability to have read-only access into the contents of an internal snapshot while the rest of qemu continues to write into the image. > 2. Use Paolo's runtime NBD server to export the snapshot slave when > the VM is forked: An NBD server on top of the read-only state is an additional step that will make access easier. -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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