Journaling

By default, VMs which are bound to an internal vSwitch (that is, a vSwitch with no pNIC uplinks) cannot be vMotioned. This behavior can be altered by adding the following to the config flag in the vCenter vpxd.cfg file:
[migrate]
[test]
[CompatibleNetworks]
[VMOnVirtualIntranet]false[/VMOnVirtualIntranet]
[/CompatibleNetworks]
[/test]
[/migrate]
http://kb.vmware.com/kb/1006701
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