[XCP] XCP-ng support

[Virtualtek]

When do you plan to release the final version ?

[Gostev]

H1 2026

[evanrac]

I tested our beta against XenServer 8.4 in my homelab and was able to take backups. We provided the beta to the XenServer team for testing in their labs, but I'm not aware of internal testing yet on other Xen-based platforms. If you have a test environment, please feel free to give it a try and provide any feedback.

Hi Cody and team,

I am going to try the public beta on our XenServer cluster with gfs2 filesystem. The beta page states the following:

Supported datastores: ext, nfs, lvm, lvmoiscsi, lvmofc, lvmohba.
Other datastores can be enabled via an appsettings key (available from R&D upon request).

How can I get the appsettings key for the plugin to enable other datastores, such as gfs2 for testing?

Cheers!

[evanrac]

I just answered my own question, I found the appsettings file at "C:\Program Files\Veeam\Plugins\XEN\Service\appsettings.json" - and some flags in there that were set to "AllowAnyStorage = false" and changed them to true, then the iSCSI GFS2 SR showed up.

The excellent news, is that I was able to perform both a backup from and a restore to the XenServer GFS2 SR for a VM, and it booted, hurray! I noted that the worker VM that gets created attaches the disks that are being restored to itself, cleverly working around the GFS2 storage locks problem.

The restore performance leaves a bit to be desired, though. The Xen worker VM was capped at restoring around 50MB/s. However it is only a beta and I'm sure it will get tuned to be faster over time.

I look forward to the full GA release and re-deploying our Veeam backup solution on the dedicated software appliance when it is supported

[lpolnik]

Hello,

Environment Overview
I am using a beta version of Veeam B&R downloaded via: rhv-olvm-sc-hypercore-xcp-ng-hpe-vme-f6 ... 00399.html
The lab environment consists of three XCP-ng 8.3.0 nodes configured in a High Availability (HA) pool, managed by Xen Orchestra version 5.113.2.

Issue Description
It is not possible to perform a backup of a virtual machine if its disk is located on an xostor datastore. When I start the backup job, I receive the following error:

Code: Select all

(..) (Async.VDI.enable_cbt) failed: . SR_OPERATION_NOT_SUPPORTED (..)

A more detailed log is shown below:

Code: Select all

2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]: Task 424b422b-6173-4747-aad9-e263205bfd3b result: Failed: System.AggregateException: One or more errors occurred. (Failed to perform backup: [TBD] Task 66d43d44-5cb3-2562-4895-3b79b5a27924 (Async.VDI.enable_cbt) failed: . SR_OPERATION_NOT_SUPPORTED. OpaqueRef:f99c8113-e0a2-1d66-be2d-bb12de0607dc)
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:  ---> Veeam.Vbf.Common.Exceptions.ExceptionWithDetail: Failed to perform backup: [TBD] Task 66d43d44-5cb3-2562-4895-3b79b5a27924 (Async.VDI.enable_cbt) failed: . SR_OPERATION_NOT_SUPPORTED. OpaqueRef:f99c8113-e0a2-1d66-be2d-bb12de0607dc
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:    at Veeam.Vbf.BackupAgent.BackupXen.XenBackupManager.PerformBackupAsync(VbrVmBackupSession vbrBackupSession, VmBackupParams vmBackupParams, VirtualMachine sourceVm, CancellationToken cancellationToken)
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:    at Veeam.Vbf.BackupAgent.BackupXen.XenBackupManager.BackupVmAsync(VmBackupParams vmBackupParams, CancellationToken ct)
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:    at Veeam.Vbf.BackupAgent.BackupXen.XenBackupRestoreAgentService.BackupVmAsync(VmBackupParams params, CancellationToken cancellationToken)
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:    at Veeam.Vbf.BackupAgent.Service.TaskService.AwaitTask(Guid taskId)
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:    at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:    at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
2025-12-18 10:51:59.6488 00019 [1298] ERROR | [TaskService]:    --- End of inner exception stack trace ---

I found a forum post which suggests that, at the moment, xostor does not support CBT. Please correct me if I am mistaken.
Link: https://xcp-ng.org/forum/topic/5361/xos ... review/451