Guidance for upgrade from Server 2022 to 2025 on ProxMox?

[dimante]

No matter what I do on my two current windows 2022 servers I cannot get server 2025 to upgrade. I have rolled back to 0.1.229 virtio drivers, etc and it keeps coming back with the same error every time:

Hardware setup:

Any advice would be greatly appreciated.

 

[dimante]

More joy and looking at other posts. The solution for me was to remove processor type "qemu64" and choose host. Here's the rub though. You cannot change it to this processor type that worked fine on server 2022. If I try to swap it back it goes into a reboot loop. Does anyone have any insight on why this is the case and the qemu64 processor type seems to be damned in Server 2025?

 

[cwt]

Is the VM in a boot loop? Backups available? Server 2025 creates larger bootloader structures, writes new BCD files and updates secure boot components. In the first place, I would create a new and larger EFI disk, mind. size 32M - better 64M. In addition, deactivate IOTHREAD & DISCARD only for the update process. If everything works, you can re-enable this. CPU type qemu64 is not really a good choice. Try x64-64-v2/v3.

 

[dimante]

A boot loop happens when the processor type is changed to anything other than host. Any advantages to x64-64-v2/v3. over host?

 

[_gabriel]

"host" is not more the fastest since Windows latest version often enables virtualization which triggers the unwanted nested virtualization.

 

[dimante]

Thanks. x86-64-v2 is the only profile that will allow boot. Performance seems good as well.

 

[SteveITS]

Do you have a TPM?

 

[dimante]

There is a TPM present on the host, yes.

 

[SteveITS]

I meant on the VM. I see it’s required for Windows 11 but not Server so never mind.

 

[_gabriel]

Thanks. x86-64-v2 is the only profile that will allow boot. Performance seems good as well.

"max" should be the best performance.
"x86-64-v2" without aes is for ancient cpu, what is your real cpu ?

 

[dimante]

The AES option also works - thank you I will use that. This is the tools version I am using also. I have seen some posts that the latest drivers and 2025 have issues.

 

[dimante]

You asked about host CPU:

24 x Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz (2 Sockets)

 

[SteveITS]

There are later drivers than .229:
https://pve.proxmox.com/wiki/Window..._issues_with_IO-heavy_Windows_Server_2025_VMs

 

[dimante]

And another question. Do I need both of these?

 

[_gabriel]

yes

 

[dimante]

I don't know how the Virtio-win-driver-installer got installed...