MPIO can be added to Hyper-V 2012 R2 (the free hypervisor) because it is a feature, not a role.
No other roles can be added to this server.
Make sure your iSCSI initiator service is running (PowerShell or RSAT), run Install-WindowsFeature Multipath-IO (or use RSAT to add the feature), reboot, finish setting it up (timeouts, load-balancing, etc) and you are ready for MPIO goodness!
I don't think you can install the Windows Toolkit on the hypervisor... would be nice to have though!
From previous post: I don't think you can install the Windows Toolkit on the hypervisor... would be nice to have though!
FYI to Paul and anyone else interested:
I tried installing the Windows Toolkit on our 2012 R2 hypervisors, and YES, so far everything is working fine -- including Nimble Connection Manager. I just run the executable from command prompt, and it launches and does all the work for me when adding or removing volumes.
Very cool, Nimble!