Github user wido commented on the pull request:
https://github.com/apache/cloudstack/pull/985#issuecomment-152460936
@ustcweizhou Which version of libvirt are you using?
<pre>If you use libvirt 1.0.6 or newer, you can omit the path='...'
attribute of the <source> element, and libvirt will manage things automatically
on your behalf.</pre>
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