Trying to deploy Generation 2 (Gen2) Windows Server 2012 R2 Virtual Machines from System Center Virtual Machine Manager (SCVMM) templates over the weekend, I found consistent failures with Error (23352): Error (23352) VMM cannot find the device or this device is not valid for a boot device. Recommended Action Make sure you specify a valid device as a boot device. On the Details tab, the deployment task fails at "Change properties of virtual machine." Digging a bit on the web, I found these symptoms matched the following TechNet forum thread: Cannot create VM from Gen2 template The resolution to the [...]

Having fun on a Saturday, recorded this nice benchmark showing the improvements booting from the network between Hyper-V Gen1 VMs w/Legacy vs. Gen2 VMs w/Synthetic. For more details, check out Aidan's blog (http://www.aidanfinn.com/?p=14913) or Technet for more details on Gen2 VMs. http://www.youtube.com/watch?v=qvGcp7ZRSxw&feature=youtu.be The Gen1 w/Legacy took about 11 minutes end to end while the Gen2 w/Synthetic finished in about 8 minutes. As always, if you have any questions, comments, or just want to leave feedback, please do so below.  Thanks for reading! @youngtech