Hi, After review by John Ferlan I'm sending a revised version of my earlier patch which adds the fast-diff feature for RBD volumes. Before the patch there is one small improvement which is later used by the fast-diff feature. The other is a bugfix where the #ifdef in the code wasn't requiring the right version of librbd. Wido -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list