Github user kiwiflyer commented on the issue:
https://github.com/apache/cloudstack/pull/1644
Pure RBD based revert is not supported today (plus it's really slow). The
way we do it is we snap to volume (clone), shut the vm down, then detach the
old disk and reattach the new disk to the vm. We submitted a patch a few months
back to allow for a root volume to be detached and reattached by specifying the
number of the volume as 0 - https://github.com/apache/cloudstack/pull/1500.
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