A hotfix has been released today for Windows Server 2012 Hyper-V servers which are unable to access LUNs over a Synthetic Fibre Channel after a VM is live migrated to another host in the cluster.
This problem can occur if the following conditions are met:
- You have two Windows Server 2012-based computers that have the Hyper-V role installed
- You install a virtual machine on one of the Windows Server 2012 Hyper-V hosts
- You set up a guest failover cluster, and then you make the virtual machine a cluster node
- The virtual machine is configured to access LUNs over a Synthetic Fibre Channel
- You try to perform live migration to move the virtual machine to another host.
This issue is caused by the inability of the Hyper-V host to restore the Synthetic Fibre Channel LUN on behalf of the virtual machine during live migration.
The problem applies to Windows Server 2012 Standard and Datacenter.
For further details look up the Microsoft Support Article: http://support.microsoft.com/kb/2894032