Forum Discussion
ISSUE - FIXED - Hyper-V VM In-Place Upgrade (IPU) WS 2022 to WS 2025 b26063 fails
- Update on this investigation:
The Windows Boot team looked over logs from my repro and noticed that the upgrade sequence depends on creating a large (500MB) RAM disk and that ramdisk creation is failing due to not enough memory. Since the documented recommendation for Windows Server with Desktop Experience is 2GB, I turned off Dynamic Memory and set the RAM to 2048 GB.
This resolved the issue for me - in-place upgrade now succeeds.
Karl, can you please see if that same mitigation works for you?
If so, I can follow up with the MSLab owners to see if they can change the memory configuration.
Thanks,
Michael
MicrosoftOh, please also include which edition of Server you are using.
I tried the most basic Server 2022 -> Server 2025 upgrade scenario on Hyper-V. I used a Gen 2 VM with 4GB of RAM. I started with a vanilla image of Datacenter with Desktop Experience, Windows Server 2022, with February patches, and then attached an ISO of WS 2025 26063 and ran Setup.exe. It worked fine.
So, let's figure out what's different in your setup.
MSBernstein I am thankful you are investigating this.
If you like we can have a remote session to figure this out.
I am using mslab (github) with Windows Server 2025 on the metal / host OS and Windows Server 2022 guest VMs. The ISO Origins from 2025 Insider portal and WS 2022 from latest Visual Studio subscription. So no VL / EVAL.
You can contact me via Teams if you like, for a remote session, also if you have questions on mslab.
MSBernstein could this note from 26080 be related to the issue we're discussing here?
"If you are validating upgrades from Windows Server 2019 or 2022, we do not recommend that you use this build as intermittent upgrade failures have been identified for this build."- MSBernsteinPerhaps, but you saw the same issue on 26053.
I looked up what MSLab is, which I had not been familiar with. I had been running the repro by hand. I'll plan to retry it with MSLab a little later in the week. I do want to get to the bottom of this.- MSBernstein
I'm working through the process of doing this in MSLab. Based on the pictures you documented, I assume it is the 'DC' VM that I need to update - but I am getting a strange complaint about an additional step I need to take for the domain controller. Did you see this as well? Is there a reasonable way to address this? (I can see that the link documents a set of steps, but this seems rather far off the track of a simple upgrade.)
