We are now live again with all the VMs - which is a relief.

The above steps from @stormi were great, the one thing I notced was the /etc/stunnel/certs directory didn't exist. I created that manually and everything else seemed happy.

I did have to mess about a bit with the fibre NICs, but I've repeated the previous renaming and that's now running fine.

Thanks very much for all the help - I appreciate it.

It looks like this is identified and solved, I'll test on a new version of XO next week at some point, but I just wanted to confirm that I've been seeing what appears to be the same problem.

This hasn't affected any of my full, delta or mirror backups, on any of the NFS targets - but it does affect two different Pool metadata & xo config backups. Both on different NFS targets on different schedules.

It's an infrequent failure, sometimes not failing for a couple of days, but sometimes failing up to 3 or 4 times per day - this is on an hourly schedule.

My most recent failure on the hourly job was yesterday morning, the one before that was almost 24 hours earlier.
This is currently on Xen Orchestra, commit 24913 but it was also noticeable on a version from the end of July.

From what I've read, I'm guessing the fix will be in the main branch soon enough and an update will solve it, but if there's any useful information I can provide, please let me know.

@Danp
RTFM is so often the correct answer - this was my error
I've followed those instructions and done this with the VM shut down and it's completed in seconds.

The migrated machine has boosted up, although with a small delay. I think that's linked to an issue with the NIC. It's not landed on the network but I'll keep digging into what netplan might be doing there.

Thanks very much for your help and for your pateince.

@olivierlambert
Apologies - I wasn't clear at all about that!

I used the script at https://github.com/ronivay/XenOrchestraInstallerUpdater and it does seem to be using systemd

I have found some interesting info so far, but I'm going to make sure I'm fully updated and have a recent log entry to reference.

Thanks very much for yoru help and patience