The issue of vMotion of virtual machine failing after upgrading from ESXi 5.0/5.1 to ESXi 5.5 Update 3b or 6.0 Update 1b is resolved in ESXi 6.0 Update 2.Symptoms:
After upgrading from ESXi 5.0/5.1 to ESXi 5.5 Update 3b or 6.0 Update 1b, you experience this symptom:
Performing a vMotion of a virtual machine from an ESXi 5.0/5.1 host to a ESXi 5.5 Update 3b or 6.0 Update 1b host fails.
Note: For additional symptoms and log entries, see the Additional Information section.