Github user kiwiflyer commented on the pull request:
https://github.com/apache/cloudstack/pull/1500#issuecomment-212400883
@koushik-das - Our use case is to emulate a snapshot revert with Ceph by
using createVolume sourced from a snapshot, then detaching and reattach the
root volume of a VM with device id of 0.
This preserves the previous volume history and allows the user to switch
back and forth between different snapshots.
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