Github user jburwell commented on the issue:
https://github.com/apache/cloudstack/pull/1710
@ustcweizhou @ozhanrk this feels like a relatively narrow case (RBD on
KVM), and we are extremely late for 4.9.1.0. We have numerous "small" fixes
that could be included that would further delay significant fixes that affect
nearly users. I am sorry, but this fix will have to wait until
4.9.2.0/4.10.1.0/4.11.0.0.
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