Github user mlsorensen commented on the pull request:
https://github.com/apache/cloudstack/pull/81#issuecomment-74774048
I went digging to see what might have prompted this fix, and it seems that
qcow2-based storage wasn't notifying qemu when the storage resized. I've
committed a fix for this that should hit 4.5 and should allow qcow2-based (and
hopefully RBD as well) disks to get live resized.
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