Github user ustcweizhou commented on the pull request:
https://github.com/apache/cloudstack/pull/977#issuecomment-151491475
@bhaisaab Thanks for your comments.
The motivation of CreateSnapshotFromVMSnapshotCmd is, when we create a
volume snapshot for a running vm on KVM, it will create a vm snapshot at first
then create a volume snapshot from vm snapshot. Hence I think it is useful to
create a volume snapshot directly from vm snapshot if it already exists.
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