Thank you every visitors and for those who did not had the chance to visit fosdem check this report:
https://xcp-ng.org/blog/2026/02/19/fosdem-2026-follow-up/
[image: vates-xcp-ng-at-fosdem-2026-1.webp]
One question, I promised to forward to the forum, how many VM are you running on XCP-ng ?
Dozen, hundreds, thousands or more ?
Hello,
I migrated an older xenserver 8.2 cu1 to xcp-ng 8.3.
This was because we replaced the old server with a new HP ML350 Gen 11 with Xeon sivler 4510 CPU.
We see that the vm's are unrespnive sometime.
Sometime they react again after a while, sometime I can do a reboot but sometime tehy hang 100%
I dit already past week an update of xcp-ng (yum update).
I know there si a new firmware release wich I will try these weekend.
But does anyone knows why we have this issu on this new hardware.
What is the corret settings for an HP ML350 server?
Is there still an issue with C-states?
Or must I create a new vm and attached the old disk to the new vm's?
We use the latest xcp-ng pv singed drivers.
I also will start an VM wiht a ubuntu live and see if that will stuck to.
All imput are welcome.
Kr,
Roel Niesen
Some additional information since my original post.
The first time a backup runs after upgrading i see the log entries i posted above. The second time the backup runs, i see the messages in the screenshot i posted and a full backup run as the result. So it can be easily to think everything is working fine after updating and running a job only one time unless you are watching xo-server via journalctl or run the job a second time. I have run into this across 2 XOA appliances as well as 2 XOCE installs, all on unrelated networks / locations.
Difficile de parler de « réalité » avec les benchmarks. Vérifiez aussi l'iodepth (qui dépend du type matériel que vous avez, sur du flash/NVMe vous pouvez monter à 128 ou 256), la latence entre en compte aussi bien sûr.
Le bottleneck principal est le monothreading de tapdisk, si vous testez sur plusieurs VMs différentes la somme va monter de manière assez régulière.
