When I opened my support ticket I was told that it was a bug and should not have happened. In our case when the host was removed and added back VDM lost sight of a pool of persistent desktops (even though the desktops stayed online and continued to communicate with the broker). If these were a non persistent pool it wouldn't have been a big deal but since these disk contained data and at the time where was no easy way to import desktops into a VDM pool so it quickly turned into a bad situation.
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