Hello @poddingue , you right.

Yes i saw this article, but it was unrelated to my issue.

I agree your guess.

How can i mark the topic as Solved ?

Hello.

Problem Solved.

My case:

• i have a pool of many hypervisors with only local storage, no shared SR ( yes it's not recommanded, i stopped doing this and i'm currently migrating everything to pool with Shared storage ).

Yesterday, i removed two hosts ( host 3 & host 4 ) whith local storages SR attached ( LVM ).

In XCP-NG, i "forgot" Host 3 & host 4, the hosts from the pool, but it doesn't forge the associated SR !

But Live migrating a VM from host 1 to host 2 ( of the same pool ) bot with local SR, FAIL because there is no SR plugin attached of Local Storage 4 ( hosts 4 ) neither Local storage 3 ( host 3 ).

So, i also forget theses 2 SRs and now it's ok.

i don't understand why SR not connected to anyone can prevent migration about vm from other to other sr.

Hello.

I have this error while trying to migrate VM from a host to another host. ( same versions ).

Jul 10 10:58:06 server xapi: [debug||3148384 ||storage_utils] Got failure: checking for redirect, call was: -> SR.scan({sr:S(a2e6300f-10f2-ec61-bcfb-6a1d62a00bff);dbg:S(Async.VM.migrate_send R:afa4f5b49fd9)}), results.contents: ["No_storage_plugin_for_sr","a2e6300f-10f2-ec61-bcfb-6a1d62a00bff"]
Jul 10 10:58:06 server xapi: [debug||3148384 ||storage_utils] Not a redirect: -> SR.scan({sr:S(a2e6300f-10f2-ec61-bcfb-6a1d62a00bff);dbg:S(Async.VM.migrate_send R:afa4f5b49fd9)})
Jul 10 10:58:06 server xapi: [error||3148384 ||storage_interface] Storage_error ([S(No_storage_plugin_for_sr);S(a2e6300f-10f2-ec61-bcfb-6a1d62a00bff)]) (File "ocaml/xapi-idl/storage/storage_interface.ml", line 451, characters 49-56)
Jul 10 10:58:06 server xapi: [error||3148384 ||storage_migrate] Storage_migrate.MigrateLocal.prepare Caught error Storage_error ([S(No_storage_plugin_for_sr);S(a2e6300f-10f2-ec61-bcfb-6a1d62a00bff)]) while preparing for SXM
Jul 10 10:58:06 server xapi: [error||3148384 ||storage_migrate] Caught Storage_error ([S(Migration_preparation_failure);S(Storage_error ([S(No_storage_plugin_for_sr);S(a2e6300f-10f2-ec61-bcfb-6a1d62a00bff)]))]) during SXM:
Jul 10 10:58:06 server xapi: [error||3148384 ||task_server] Task 3 failed; Storage_error ([S(Internal_error);S(Storage_error ([S(Migration_preparation_failure);S(Storage_error ([S(No_storage_plugin_for_sr);S(a2e6300f-10f2-ec61-bcfb-6a1d62a00bff)]))]))])
Jul 10 10:58:06 server xapi: [debug||3148384 ||storage] TASK.signal 3 = ["Failed",["Internal_error","Storage_error ([S(Migration_preparation_failure);S(Storage_error ([S(No_storage_plugin_for_sr);S(a2e6300f-10f2-ec61-bcfb-6a1d62a00bff)]))])"]]

Do you know what No_storage_plugin_for_sr mean ?

It's a simple local storage

Hello there

I start to use slowly XO6 since many features was added.

But i observe this:

I have a VM with 3 backups jobs associated:

• 02/07/2026 - 8H47: Success
• 02/07/2026 - 8H48: Fail
• 02/07/2026 - 8H54: Success

But in the UI, i see this:

The jobs should be order from the "most recent" to "older one" ( or vice versa, i don"t have opinion on it ).

But showing the fail as the first make us thinks that the last jobs fail, that's not the case.

I should have:

Thank you

Hello,

All is in the title

Is this normal ?

Thanks !

Hello,

Thanks for all !

Hello,

To gave more details abouit my case:

• XCPNG: 8.3.0
• CPU: AMD EPYC 4464P 12-Core Processor
• Kernel: 6.12.0-211.18.1.el10_2.x86_64

Hello,

When i boot a Rocky Linux 10 with the latest kernel, it's very slow on cpu XXX spinlock event irq.

Someone have the same issue ?

Thanks !

@gregoire said:

@olivierlambert I added this feature request in the backlog regarding RPU improvements.

Hello,

Thanks all !

Totally agree with @poddingue , be able to exclude VM which has:

• PCI attached devices
• Local storage ( maybe ? )

Could be a great option !

Hello @McHenry .

Yes but no, once the snapshot is exported, the previous one must be cleaned on local.

Best regards,

Hello,

I see also this behavior which is "new" since few weeks.

Previously, when a backup start:

• it stake a snapshot ( if there another one before, it delete it ).
• it upload the snapshot as a backup
• it coalesce the backup on the remote.
• end of the game.

Now, the old snapshots are not deleted anymore which can lead easily to some disk full.

Even with a retention of 1, the problem is present.

I observe this only in Backup job, not DR/CR job.

I just updated my XO to latest version, i will see if the issue is fixed.

Hello,

In the post about XCP-NG 9.0, there was a discussion about Storage Domain Virtual machines, as i understood, the project was abandonned, but the concept is still doable without this implementation.

https://xcp-ng.org/forum/post/102311

On each of my hosts, i have a VM dedicated for ceph which mount the PCI devices ( NVME disks ).

Everything works like a charm !

But the RPU is not available due to the VMS which have PCI attached resources.

Is it possible to exclude VMS from RPU and make it shutdown before the upgrade ?

something like you done to exclude Security warning about old windows guest tools.

This would be very great

Hello @nikade.

I agree but this is my case.

Try to migrate a running VM: error 500
Try to migrate an halted VM: error 500.
Warm migrate: It's okay.

I don't understand myself the difference except it doesn't transfer the "VM" but recreate the VM and import the VDI, ( so , the same things ), but there may be a light difference. I don't know how the "warm migration" works under the hood

Hello,

I was able to perform "Warm" migrate from either the slave or the master.

Yes the master was rebooted.

@henri9813 Did you reboot the master after it was updated? If yes, I think you should be able to migrate back the VM's to the master, and then continue patcting the rest of the hosts.

No, i would migrate back vm from MASTER (updated ) to slave ( not updated ), but wasn't working.

Only warm migrations works.

Hello, @Danp

My pool is in upgrade, not all nodes are updated.

1. I evacuate the master hosts's vms to the slave node except 3-4 vms which are "very not important and can be shut for few minutes
2. I upgrade the master node with success
3. I WANT to move all vms to the master, but it deosn't have enought disk space, so i tried the following:
   a. Migrate the very not important VM to the slave node ( not updated ) to have enought space to move the "important" vms.
   b. Move vms of the updated master to ANOTHER pool.

I tried both:

• VM running
• VM halted

Thanks !

I have an updated pool.

I'm evacuating an host for update to another pool.

But the operation fail, and remains in the XO tasks

VM metadata import (on new-hypervisor) 0%

and in the VM.migrate api call detail.

vm.migrate
{
  "vm": "30bb4942-c7fd-a3b3-2690-ae6152d272c5",
  "mapVifsNetworks": {
    "7e1ad49f-d4df-d9d7-2a74-0d00486ae5ff": "b3204067-a3fd-bd19-7214-7856e637d076"
  },
  "migrationNetwork": "e31e7aea-37de-2819-83fe-01bd33509855",
  "sr": "3070cc36-b869-a51f-38ee-bd5de5e4cb6c",
  "targetHost": "36a07da2-7493-454d-836d-df8ada5b958f"
}
{
  "code": "INTERNAL_ERROR",
  "params": [
    "Http_client.Http_error(\"500\", \"{ frame = false; method = GET; uri = /export_metadata?export_snapshots=true&ref=OpaqueRef:75e166f7-5056-a662-f7ff-25c09aee5bec; query = [  ]; content_length = [  ]; transfer encoding = ; version = 1.0; cookie = [ (value filtered) ]; task = ; subtask_of = OpaqueRef:9976b5f2-3381-e79e-a6dd-0c7a20621501; content-type = ; host = ; user_agent = xapi/25.33; }\")"
  ],
  "task": {
    "uuid": "9c87e615-5dca-c714-0c55-5da571ad8fa5",
    "name_label": "Async.VM.assert_can_migrate",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20260131T08:16:14Z",
    "finished": "20260131T08:16:14Z",
    "status": "failure",
    "resident_on": "OpaqueRef:37858c1b-fa8c-5733-ed66-dcd4fc7ae88c",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "INTERNAL_ERROR",
      "Http_client.Http_error(\"500\", \"{ frame = false; method = GET; uri = /export_metadata?export_snapshots=true&ref=OpaqueRef:75e166f7-5056-a662-f7ff-25c09aee5bec; query = [  ]; content_length = [  ]; transfer encoding = ; version = 1.0; cookie = [ (value filtered) ]; task = ; subtask_of = OpaqueRef:9976b5f2-3381-e79e-a6dd-0c7a20621501; content-type = ; host = ; user_agent = xapi/25.33; }\")"
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename ocaml/libs/http-lib/http_client.ml)(line 215))((process xapi)(filename ocaml/libs/http-lib/http_client.ml)(line 228))((process xapi)(filename ocaml/libs/http-lib/xmlrpc_client.ml)(line 375))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 39))((process xapi)(filename ocaml/xapi/importexport.ml)(line 313))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 39))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 39))((process xapi)(filename ocaml/xapi/xapi_vm_migrate.ml)(line 1920))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 2551))((process xapi)(filename ocaml/xapi/rbac.ml)(line 229))((process xapi)(filename ocaml/xapi/rbac.ml)(line 239))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 78)))"
  },
  "message": "INTERNAL_ERROR(Http_client.Http_error(\"500\", \"{ frame = false; method = GET; uri = /export_metadata?export_snapshots=true&ref=OpaqueRef:75e166f7-5056-a662-f7ff-25c09aee5bec; query = [  ]; content_length = [  ]; transfer encoding = ; version = 1.0; cookie = [ (value filtered) ]; task = ; subtask_of = OpaqueRef:9976b5f2-3381-e79e-a6dd-0c7a20621501; content-type = ; host = ; user_agent = xapi/25.33; }\"))",
  "name": "XapiError",
  "stack": "XapiError: INTERNAL_ERROR(Http_client.Http_error(\"500\", \"{ frame = false; method = GET; uri = /export_metadata?export_snapshots=true&ref=OpaqueRef:75e166f7-5056-a662-f7ff-25c09aee5bec; query = [  ]; content_length = [  ]; transfer encoding = ; version = 1.0; cookie = [ (value filtered) ]; task = ; subtask_of = OpaqueRef:9976b5f2-3381-e79e-a6dd-0c7a20621501; content-type = ; host = ; user_agent = xapi/25.33; }\"))
    at XapiError.wrap (file:///etc/xen-orchestra/packages/xen-api/_XapiError.mjs:16:12)
    at default (file:///etc/xen-orchestra/packages/xen-api/_getTaskResult.mjs:13:29)
    at Xapi._addRecordToCache (file:///etc/xen-orchestra/packages/xen-api/index.mjs:1078:24)
    at file:///etc/xen-orchestra/packages/xen-api/index.mjs:1112:14
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (file:///etc/xen-orchestra/packages/xen-api/index.mjs:1102:12)
    at Xapi._watchEvents (file:///etc/xen-orchestra/packages/xen-api/index.mjs:1275:14)"
}

My XO is up to date.

I already update the master, i'm processing the slave.

But neither the master ( updated ) nor the slave ( not updated ) can migrate VM to an updated pool.

Do you have an idea ?

Hello @florent ,

You mean, "check" right ? because if it's doesn't check, the job is finished before the merge and the merge run in background in xen orchestra.

Best regards,

Hello, @Pilow

Thanks for the tips !

But it would be great to see it in the Task UI to find more easily the trick.

Hello,

Sometimes, i have on some jobs ( which run every 4 hours ).

Howerver, the previous job is finished in success

Is it possible that has a relation with the mergeWorker of backups which could be running ? if it doesn't finished his operations ?

Example of logs:

xen-orchestra      | 2025-11-27T00:44:43.487Z xo:backups:mergeWorker INFO merge in progress {
xen-orchestra      |   done: 2057,
xen-orchestra      |   parent: '/xo-vm-backups/f37e259d-beaa-7617-e6f1-be814f21e056/vdis/29e0185e-2f67-44d4-bb9e-ee2a772e2543/b09c0230-219f-4ddf-8e19-bfed1464014f/20251126T070610Z.vhd',
xen-orchestra      |   progress: 25,
xen-orchestra      |   total: 8128
xen-orchestra      | }

Is it possible to have this in the XO Tasks sections ? it's interessant to see this.

Best regards

Hello @ronan-a ,

but how recover from this situation ?

Thanks !