Verified at :
oVirt Engine Version: 3.5.0-0.0.master.20140804172041.git23b558e.el6vdsm
vdsm Version : vdsm-4.16.1-6.gita4a4614.el6.x86_64
manually , and by automation test.
https://tcms.engineering.redhat.com/case/398664/?from_plan=9583
(~/git/ART/art/tests/rhevmtests/storage/storage_bug_coverage/test_exposing_bugs.py)
both using dd.fake script as explained in https://bugzilla.redhat.com/1119226