Migrating VMware VMs with PVSCSI and EFI disk

[unsichtbarre]

Howdy,

I have been doing a bunch of VMware to Proxmox migrations recently (all successful so far!) but I have an issue with PVSCSI and EFI using Veeam.

The only way I have been able to successfully migrate VMs with Veeam which have PVSCSI and EFI is to continue to use the PVSCSI driver on Proxmox. If I try to use VirtIO, I have no opportunity to map the bootloader as it does not see the disk.

I'd rather not use the Proxmox native utility because it is so slow, is there another way?

THX,
-JB

 

[psalkiewicz]

Hi,
It's a matter of activating virtio drivers at boot time. First you need to install virtio drivers on the virtual machine. Second of all you need to activate them so they load at boot time.

You can do it 2 ways - one is to add a temporary drive to load the drivers or you can you our powershell script to do it without extra hassle:

https://github.com/croit/load-virtio-scsi-on-boot

 

[_gabriel]

@Falk R. makes a small game changer
for Windows migration to Proxmox
Script install the drivers (the easy part) then create a fake temp. virtio scsi drive to activate the driver as boot critical mass storage driver

[TUTORIAL] Thread 'A small game changer for Windows migration to Proxmox'

Mar 12, 2026

After presenting my modified ISO in the German forum section some time ago, the optimized version is now available in English.

Since I came up with the method for migration with minimal downtime, I have more good news today.
It is possible to install the Virtio drivers in advance so that Windows can boot directly from VirtIO SCSI after migration. To make it a little easier for everyone, I modified a virtio ISO and stored an installation batch file there.
The install.bat must be run as an administrator, and I also modify the SAN policy so that additional disks in Windows come online after...

• Falk R.
• migration vsphere windows
• Replies: 2
• Forum: Proxmox VE: Installation and configuration

• 

 

[Johannes S]

The scripts from croit and Falk are basically doing the same if I didn't miss something. So it should work either way to activate the virtio drivers.