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Pieter

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Reply with quote  #1 
Is Win2019 supported as a Virtual Machine on Hyper-V 2012 R2 ?

Sorry for such a easy question, but I can't seem to find it.



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Pieter Demeulemeester
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cj_berlin

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Reply with quote  #2 
According to https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/dn792027%28v%3dws.11%29 it isn’t.
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Pieter

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Reply with quote  #3 
Thanks Evgenij, that's what I was looking for.

Pity they don't explicitly mention that Win2019 is not supported, and the article is dated november 2017, long before Win2019 exists. But well, I'll go for the *not supported*.

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Pieter Demeulemeester
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dennis-360ict

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Reply with quote  #4 
I think the basic rule is one-up. So ws12r2 host can have ws16 guest, but not ws19. Ws16 host can have ws19 guest.

Having said that, i just installed 4x ws19 guests on my ws12r2 host..

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Pieter

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Reply with quote  #5 
Same here, I installed a Win2019 on Hyper-V Win2012R2.

That's why I want to find a MS statement that makes sure that W2019 is not supported on Hyper-V 2012R2.


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Pieter Demeulemeester
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dennis-360ict

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Reply with quote  #6 
The one-up isn’t stated as a rule I see, prob got that from an unofficial source.

Ps. Release info is on github now:
https://github.com/MicrosoftDocs/windowsserverdocs/blob/master/WindowsServerDocs/virtualization/hyper-v/Supported-Windows-guest-operating-systems-for-Hyper-V-on-Windows.md

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Protech

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Reply with quote  #7 

I have 2019 running on 2012R2 hosts and have not seen any issues.

Is there any reason why you shouldn't? I'd like to find a MS document that
clarifies this.

I did find this though:

"In good tradition of Hyper-V the host support guest OS's versions up to N+1. This means that Windows Server 2019 is a supported guest OS on Windows Server 2016 Hosts"


Cheers


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cj_berlin

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Reply with quote  #8 
Quote:
Originally Posted by Protech
Is there any reason why you shouldn't? I'd like to find a MS document that clarifies this.

Well, for some organisations "Microsoft will not support this if there are any issues" is reason enough. For others, it's OK as long as it works.

There are two main problems involved in too wide a version gap between host und guest:
  1. Integration Commponents. The newer OS will use the ones built into it but those have never been tested with the older VMCI (or at least Microsoft claims that they do not test combinations that are not explicitly supported).
  2. Hardware emulation. As opposed to ESX and some others, Hyper-V does not emulate the core componentes, at least not for a Windows guest. Even the legacy NIC is only partly emulated. So here you also cannot assume the backward compatibility of the guest OS but rather need the full stack support from the ICs, which brings us back to 1.

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dennis-360ict

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Reply with quote  #9 
Excellent clarification cj, thank you.
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