Tag Archives: Virtual Machine Configuration Version

Get-VMHostSupportedVersion

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I wrote about this little Gem of a PowerShell Commandlet  Get-VMHostSupportedVersion before in here (there a bit more info on the impact of a VM configuration version in that blog). Now at TPv5 I took a new peak and what do we find?

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We now have version virtual machine configuration version 7.1 at TPv5. We also got 2 new version ID’s 254.0 for Prerelease and 255.0 for Experimental. Clearly Microsoft has plans here.  I’ll update this blog with a link to the documentation when I find it.

All bets are open as to where we’ll land at RTM for the virtual machine configuration version. I’m guessing that we’re feature complete at Technical Preview 5 but version numbers can get funky. Will all TP version be supported at RTM? Normally upgrades from beta / preview versions are not supported but on the other hand some people in early adopter programs are working on it already so I’m guessing they will. We’ll see, but that’s where I put my money.

Windows Server 2016 TPv4 Hyper-V brings virtual machine configuration version 7

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When building a Windows Server  2016 TPv4 Hyper-V cluster this weekend I noticed that we now have a new version of the virtual machine configuration.

When we migrate (rolling cluster upgrade, move to new cluster or host, import on new cluster or host) virtual machines to  Windows Server 2016 Hyper-V from Windows Server 2012 R2, the virtual machine’s configuration file isn’t automatically upgraded. In the past it was, which blocked moving back to a previous edition of Hyper-V. Now we can do this until we manually update the virtual machine configuration version.  This block going back but it enables our new virtual machine features. Version 5.0 is the one that’s compatible with Windows Server 2012 (R2) Windows Server 2016. Version 6.2 was what we had in TPv3 and could only run on Windows Server 2016. Windows Server 2016 TPv4 Hyper-V brings virtual machine configuration version 7.

When you have virtual machines that come from  Technical Preview v3 and you had updated the virtual machine configuration of your virtual machines or created brand new ones these would be at version 6.2. Since I do not consider it wise to keep testing these on a version of a previous preview I updated them all to version 7.

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The code below grabs all VMs on all cluster nodes (even the none clustered VMs), shuts them down, updates the configuration version and starts them again. It’s just a quick example.

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Now do NOT do this to virtual machines with configuration version 5 that you might want to move back / import to a Windows Server 2012 R2 Hyper-V host. But if you know you’ll be testing with the new features, have a blast, like me here on the TPv4 lab cluster.

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I’m still looking for the features version 7.0 enables, probably nested virtualization is one of those features I’m guessing. Happy testing!