@DustinB firstly, thank you for giving your time to engage my post.

Your response suggested to me that you are not clear where I am up to, so...

1. I do know what a Dom0 is.
2. I have already run the script on Dom0 and moved the guest VM to the xcp-ng host.
3. The problem is that the guest is not booting correctly on the new xcp-ng host.

We (my friend and I) think that the problem is that GRUB in the guest is looking for xvda2 while xcp-ng may have set up xvdaa and xvdab (file system and swap).

We suspect that I need to mount the guest file system on xcp-ng:dom0 so I can edit the GRUB configuration.

We suspect the problem is that XEN4 on the old system and xcp-ng on the new system have slightly different naming conventions.

I assume that xcp-ng is presenting the devices to the transferred guest as xvda and xvdb, so I simply need to changing the GRUB configuration.

It would be more ideal if I could change the naming in the control panel so I don't have to mount the file system of the guest but I suspect that I can't.

I have provided these other screen prints for context to help readers understand where I am up to.

https://gist.github.com/r4um/6285376
https://run.tournament.org.il/clone-corrupted-disk-in-xenserver/

I am currently working through these articles to get more insight into how I might mount the file system, but if anyone knows of a simpler way then that would be great.

I have provided as much detail as I can here to help the next person I would suggest that the script should be updated a bit to figure this out in the conversion but I suspect so few people will still be using this that it's pointless wasting time. These systems are now 12 or more years old and I expect I will be one of the last using them.

Thanks again for your attention.

I've migrated a VM from Xen4 using xen2xcp.py per: https://docs.xcp-ng.org/installation/migrate-to-xcp-ng/

The guest is Debian 12

I am aware there is already a thread that touches on this issue but I didn't follow it but did understand what information that people want provided to help: https://xcp-ng.org/forum/topic/3237/dev-xvda-not-appearing-in-guest

From my Xen4.cfg file...

#
#  Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'phy:/dev/BenVPS-vg/MineCraft01-disk,xvda2,w',
                  'phy:/dev/BenVPS-vg/MineCraft01-swap,xvda1,w',
              ]

I an new to xcp-ng, not new to Xen4. I don't currently know where the configuration files are in the file system.

The migration appears to have done what I would expect, I'm just not understanding why it's not starting up and what I need to do to pin point the fault and fix it.

Cheers D