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Please, continue to add to this article with more information for various upgrade scenarios.

The upgrade worked, but there are several things to be aware of before you start:

  1. No one else must be logged on to the computer when you begin the upgrade, except one user a member of local Administrators.
  2. All virtual machines much be in the Off state. Saved virtual machines will be identified as a reason the upgrade cannot proceed.
  3. Do not try an in place upgrade by starting booting from the DVD, you will be told to run from inside the operating system.
  4. You will not lose your virtual machine snapshots, but you are told that once you revert to a snapshot, you lose all the newer snapshots. Effectively, you lose the use of your snapshots, but you don't lose the actual snapshots. You just have to pick the snapshot that you want to start from and then you effectively lose the rest.

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Please add more experiences and scenarios to this article as you have them.

Additional References

Migrate Hyper-V to Windows Server 2012

Wiki Comments

This article used to contain a heading titled "Hyper-V: Upgrade Hyper-V 2008 R2 to Windows Server 2012". As this was about Hyper-V Server and the rest of the article was Windows Server running the Hyper-V role I have moved this heading to a new page. Follow the link for information on upgrading Hyper-V Server.

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