Also the same error for vpc option when new volumn. Error details: Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/createvol.py", line 183, in _async_vol_create self.vol.install(meter=meter) File "/usr/lib/python2.4/site-packages/virtinst/Storage.py", line 904, in install raise RuntimeError("Couldn't create storage volume '%s': '%s'" % RuntimeError: Couldn't create storage volume 'b2.img': 'Cannot run /usr/bin/qemu-img to create /var/lib/libvirt/dir/b2.img: Invalid argument'
This request was evaluated by Red Hat Product Management for inclusion in Red Hat Enterprise Linux 5.7 and Red Hat does not plan to fix this issue the currently developed update. Contact your manager or support representative in case you need to escalate this bug.
Since this has very little impact, it's not worth fixing at this point in RHEL5, since all we would do to fix it is hide those options. Closing WONTFIX