We've got a couple of Windows 2012 / Hyper-V 3 clusters, and I have a problem with network adapters on them.
If the VM is powered off, and I move it to another host (quick migration via Failover Cluster Manager), the network adapter loses it's connection to the virtuall switch - it turns to "Configuration Error".
If it's powered on, both live migration and quick migration work fine.
It's possible to demonstrate on an empty VM. I created a new VM via the Failover Cluster Manager (ie not via Hyper-V manager on one of the nodes). One NIC, attached to the single VSwitch we have. Not much memory, disk. Don't need to install an OS.
Quick migrate with the power off, and it fails to pick up the VSwitch on the next host.
Turn it on, and live migration and quick migration both work fine.
Is this supposed to happen, or a buglet in 2012?