I have a host that is currently reporting down with NO VM's on it or associated with it. However when I attempt to put it into maintenance mode, I get the following error:

Host hv-01 cannot change into maintenance mode - not all Vms have been migrated successfully. Consider manual intervention: stopping/migrating Vms: <UNKNOWN> (User: admin)

I am running 
oVirt Engine Version: 3.5.0.1-1.el6

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Mark Steele
CIO / VP Technical Operations | TelVue Corporation
TelVue - We Share Your Vision
16000 Horizon Way, Suite 100 | Mt. Laurel, NJ 08054
800.885.8886 x128 | msteele@telvue.com | http://www.telvue.com