XCP-ng 8.3 updates announcements and testing

[acebmxer]

@gleh

Installed patches on home lab. No initial issues found. Existing Windows 11 vm no issues with it on basic vm functions. Created new Windows 11 vm with 26h2 iso no issues. Also installed guest tools in both vms.

[flakpyro]

Installed on my usual test hosts without any issues so far.

[olivierlambert]

That's a pretty beefy update! It's great to see the live storage migration performance improving by a very nice margin

[olivierlambert]

Tested in my home lab, no issues so far (Intel CPU).

[abudef]

I have to say that the acceleration of the migration is really dramatic, which is particularly useful for occasional ad hoc migrations where another task needs to be performed immediately after the migration is completed.
and thanks!

[bufanda]

Installed on my usual lab pool. No issues so far seen.

[jr-m4]

Installed on 3xDell PowerEdge R350 in HA. And so far, I haven't noticed anything out of the ordinary.

[JeffBerntsen]

Installed and running on my lab system and my twinstor test pair and no problems yet.

[Andrew]

@gleh Up and running on busy pools. Rolling pool reboot worked correctly.

[gduperrey]

Thank you everyone for your tests and your feedback!

The updates are live now: https://xcp-ng.org/blog/2026/10/05/october-2026-updates-1-for-xcp-ng-8-3-lts/

We decided not to release the xen update that was initially included in the testing phase of this update cycle. It introduced changes related to support for Windows VMs with more than 64 vCPUs; a feature that is not yet fully supported and requires further work to be completely implemented.

We therefore chose to postpone it to avoid any regressions or user confusion, aiming to release a properly finalized and documented version in the near future.

This version should have no impact on your test environments, and they can continue to operate as is. Any future xen update should have a higher version number and should install over the current one.

However, if you do not wish to keep this update on your test environments, you can downgrade using the command yum downgrade xen-*.