Aidan Finn, IT Pro

Microsoft has posted a hotfix for a scenario where you cannot migrate virtual machines from a host with one kind of AMD CPU (non-Bulldozer) to another host with a Bulldozer CPU. 

• You configure a Windows Server 2008 R2-based computer as a failover cluster node.
• You perform a live migration of a Hyper-V virtual machine from a source node to a destination node.
• The source node is located on a computer that has an AMD processor that was released earlier than the Bulldozer family of processors. For example, the computer has an AMD Opteron 6100 series processor.
• The destination node is located on a computer that has an AMD Bulldozer processor. For example, the computer has an AMD Opteron 6200 series processor.

In this scenario, the migration fails, and you receive a message that states that the destination node is incompatible.

This issue occurs because the AMD 3DNow! technology is deprecated in the AMD Bulldozer family of processors. However, Hyper-V virtual machines incorrectly use the AMD 3DNow! technology when they are in compatibility mode.

A supported hotfix is available from Microsoft.

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