irtaza9

@pdonias

But same template is allowing me to give the custom size to the existing VDI in v5 of XO.

Team,

I am facing issue while giving extra storage when i select any Installation source. But when i select storage then it allow me to give size.

XO info: Xen Orchestra, commit 91314

My Windows Server 2025 Standard VM randomly becomes completely unresponsive. No response via VNC console, RDP, or any network service. The VM shows as "Running" in XO/XCP-ng Center.
RAM/CPU graphs in XO freeze at the last value. No errors or relevant logs in Windows Event Viewer (daemon/kernel), XCP-ng host logs, or hypervisor logs. Only solution is a forced reboot (or power off/on via XO). After reboot, the VM works normally for hours/days until the next freeze.

This matches known Windows Server 2025 + Xen issues.

Environment

• Hypervisor: XCP-ng (version: please add yours, e.g. 8.3.x)
• Orchestrator: XO (XOA)
• VM Details (from XO API / XO):

{
  "id": "adf48a15-0b02-6fee-21d8-895190077680",
  "name_label": "<VM name>",
  "power_state": "Running",
  "virtualizationMode": "hvm",
  "os_version": {
    "name": "Microsoft Windows Server 2025 Standard",
    "uname": "10.0.26100"
  },
  "CPUs": { "max": 4, "number": 4 },
  "memory": { "size": 17179820032 },
  "viridian": true,
  "pvDriversVersion": "9.1.145-77",
  "pvDriversDetected": true,
  "managementAgentDetected": true,
  "management agent": "9.1.145-77",
  "NIC type": "Realtek RTL8139",
  "VGA": "cirrus",
  "boot": { "firmware": "bios", "order": "cd" },
  "other": {
    "base_template_name": "Other install media"
  }
}

• Hardware Virtualization: PVHVM with paravirtualization drivers enabled.
• Storage: (please specify: local SR, NFS, iSCSI, etc. + VBD types)
• Network: Realtek RTL8139 (emulated)

Steps Already Taken

• Viridian extensions are enabled (viridian: true).
• Latest XCP-ng Windows PV Drivers + Management Agent 9.1.145-77 installed.
• Windows Server 2025 is fully updated.
• Checked host logs (xl dmesg, journalctl), guest Event Viewer — nothing at the time of freeze.
• VM uses BIOS boot (not UEFI).

Additional Context

The freeze is completely random (no specific workload, time of day, or high load trigger observed).
Reboot always resolves it temporarily.
Similar reports exist for Windows 11 24H2 / Server 2025 on XCP-ng (Viridian synthetic timer, PV drivers, emulated devices).

Questions

Are there any known issues with Realtek RTL8139 NIC on Server 2025? Should I switch to a PV network driver / different emulated NIC?
Any recommendations on VGA (cirrus) or other VM settings?
Should I try forcing a kernel memory dump next time it hangs (xl trigger <domid> nmi)?
Any other diagnostics or logs I should collect?

Thanks in advance!

@Pilow does SR.scan checks only keep-alive or do any kind of write operation or anything else?

cc: @nikade @olivierlambert

@olivierlambert is there any official documentation by your team? Will you guys add this officially in xcp-ng?

Hi,

I have attached an NVIDIA GPU to my host and completed the initial configuration successfully. The GPU is now visible in Xen Orchestra / XenCenter.

Currently, the GPU is fully assigned (passthrough) to a single virtual machine. However, my requirement is to share or virtualize the same GPU across multiple VMs.

I would like to know:

Is it possible to virtualize or share an NVIDIA GPU among multiple VMs in a Xen/XCP-ng environment?
If yes, what techniques or technologies are available to achieve this (e.g., vGPU, SR-IOV, mediated devices, etc.)?

What are the prerequisites and limitations (supported GPU models, drivers, licensing requirements)?

Any guidance or best-practice recommendations would be highly appreciated.

@ph7 worked, ty.

My vm gets ip from the dhcp server but in network tab it is not showing the assigned ip?

@Ahkh3e How you then imported this in XO?

is there any documentation for building the plugin and how to use in XO?