XCP-ng 8.3 updates announcements and testing

[flakpyro]

Installed on my usual hosts without issues. I am only making limited use of QCOW2 however.

[gduperrey]

Thank you everyone for your tests and your feedback!

The updates are live now: https://xcp-ng.org/blog/2026/08/27/august-2026-updates-2-for-xcp-ng-8-3-lts/

[Andrew]

@gduperrey Installed and running. Rolling pool update worked.

[mthird]

First time rolling update worked for my pool. Woot!

[mthird]

Spoke to soon. While the updates succeeded, one of the nodes is rebooting every few minutes due to an HA self-fence.

[manilx]

This is a new one:

Updated all our 3 pools:

Backup via CLI, runs XOA

Then DR.

Tasks showed RPU on pool PRD instead of DR. RPU finished just fine but task stayed.

Then RPU on PRD. Task did not change. Finished also fine. task stayed.

[gduperrey]

@manilx If the pools are up to date, I would try restarting the XO VM to see if the task persists.

If it does persist, it might be best to open a separate topic for the XO team.

[manilx]

@gduperrey Restarted and the task persisted. Deleted it from the list.

[acebmxer]

1 out of 3 pools at work failed rolling pool update.

When I try to put host 2 into maintence mode to finish updates i get this error...

Support Ticket - Ticket#7763405

host.setMaintenanceMode
{
  "id": "60701efd-089c-4822-97c0-1a1057f3f9aa",
  "maintenance": true
}
{
  "code": "VM_REQUIRES_SR",
  "params": [
    "OpaqueRef:841e7606-d545-cb71-f67c-e48b5114a1e8",
    "OpaqueRef:0f356ee4-62f7-9608-8be5-df68d9a5cbb2"
  ],
  "task": {
    "uuid": "a24f5565-b2cb-f392-8095-1beceb7a4a17",
    "name_label": "Async.host.evacuate",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20260828T19:57:29Z",
    "finished": "20260828T19:57:29Z",
    "status": "failure",
    "resident_on": "OpaqueRef:43c121e7-4ba4-193b-1e41-08c0f7e15690",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "VM_REQUIRES_SR",
      "OpaqueRef:841e7606-d545-cb71-f67c-e48b5114a1e8",
      "OpaqueRef:0f356ee4-62f7-9608-8be5-df68d9a5cbb2"
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename ocaml/xapi/xapi_host.ml)(line 629))((process xapi)(filename hashtbl.ml)(line 159))((process xapi)(filename hashtbl.ml)(line 165))((process xapi)(filename hashtbl.ml)(line 170))((process xapi)(filename ocaml/xapi/xapi_host.ml)(line 625))((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/rbac.ml)(line 228))((process xapi)(filename ocaml/xapi/rbac.ml)(line 238))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 78)))"
  },
  "message": "VM_REQUIRES_SR(OpaqueRef:841e7606-d545-cb71-f67c-e48b5114a1e8, OpaqueRef:0f356ee4-62f7-9608-8be5-df68d9a5cbb2)",
  "name": "XapiError",
  "stack": "XapiError: VM_REQUIRES_SR(OpaqueRef:841e7606-d545-cb71-f67c-e48b5114a1e8, OpaqueRef:0f356ee4-62f7-9608-8be5-df68d9a5cbb2)
    at Function.wrap (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/_XapiError.mjs:16:12)
    at default (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/_getTaskResult.mjs:13:29)
    at Xapi._addRecordToCache (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1229:24)
    at file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1263:14
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1253:12)
    at Xapi._watchEvents (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1460:14)"
}

SR are not connected to master host after reboot from updates. When try to connect them i get error...

pbd.connect
{
  "id": "e96ec5d8-c70f-c877-4263-f2cf763e7048"
}
{
  "code": "SR_BACKEND_FAILURE_108",
  "params": [
    "",
    "Unable to detect an NFS service on this target.",
    ""
  ],
  "task": {
    "uuid": "5574bfe5-1874-35f8-f53b-c9fc1abaebb5",
    "name_label": "Async.PBD.plug",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20260828T20:03:19Z",
    "finished": "20260828T20:03:22Z",
    "status": "failure",
    "resident_on": "OpaqueRef:43c121e7-4ba4-193b-1e41-08c0f7e15690",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "SR_BACKEND_FAILURE_108",
      "",
      "Unable to detect an NFS service on this target.",
      ""
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename ocaml/xapi-idl/storage/storage_interface.ml)(line 455))((process xapi)(filename src/lib/idl.ml)(line 558))((process xapi)(filename ocaml/xapi/storage_utils.ml)(line 148))((process xapi)(filename lib/backtrace.ml)(line 251))((process xapi)(filename ocaml/xapi/xapi_pbd.ml)(line 196))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 141))((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/message_forwarding.ml)(line 6061))((process xapi)(filename ocaml/xapi/rbac.ml)(line 228))((process xapi)(filename ocaml/xapi/rbac.ml)(line 238))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 78)))"
  },
  "message": "SR_BACKEND_FAILURE_108(, Unable to detect an NFS service on this target., )",
  "name": "XapiError",
  "stack": "XapiError: SR_BACKEND_FAILURE_108(, Unable to detect an NFS service on this target., )
    at Function.wrap (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/_XapiError.mjs:16:12)
    at default (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/_getTaskResult.mjs:13:29)
    at Xapi._addRecordToCache (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1229:24)
    at file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1263:14
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1253:12)
    at Xapi._watchEvents (file:///usr/local/lib/node_modules/xo-server/node_modules/xen-api/index.mjs:1460:14)"
}

Update - bad port on switch.......

Update 2 - After updating synology to latest version i am no longer able to mount nfs 4.1 shares. I can not create one using 4.1. I will let me create with 4.0 not 4.1 How to remount NFS that were mounted as 4.1 now as 4.0?

ALl VMS down at this location currently.

Update 3 - Resolved... Synology update broke NFS 4.1. I had to ssh into synology and edit /etc/nfs/syno_nfs_conf and add nfs_minor_ver_enable=1 Now SR's mounted.

Update 4 - Found Patch notes about NFS version change. -
Version: 7.0.1-42218
NFSv4.1 and related advanced functions (multipathing) are no longer supported on Synology NAS models with the following package architectures: Alpine, Alpine4k, armada38x, Avoton, Braswell, Bromolow, Cedarview, Grantley, Monaco. If you had previously enabled NFSv4 and NFSv4.1, the maximum NFS protocol is set to NFSv4 by default after the update. For more information about the package architecture of your model, please refer to this article.

Our unit - RS1219+ Intel Atom C2538 Avoton

[XCP-ng-JustGreat]

I deferred applying the preview patches this time in order to try my luck again with RPU. Unfortunately, it did not work for me again as it has not in the past. My results are similar to others here: primary host patch application went fine including the reboot. However, once it began doing a secondary host, it started throwing errors e.g. CANNOT_EVACUATE_HOST and VM_REQUIRES_SR etc. However, manually putting the host in maintenance mode from the GUI evacuated each host just fine and I was able to apply the patches and reboot each subsequent host from the XO GUI. Also, as with others here, the RPU task hung in the task list and even a reboot of the XO VM would not clear it forcing me to delete the task using xo-cli e.g. xo-cli rest del tasks.
ENVIRONMENT: Home lab consisting of 4 x Dell OptiPlex 7040 i7-6700 SFF hosts, 48GB RAM each, 10 Gbps storage connections to a TrueNAS home-built NAS via NFS and XO from source (XOS) using @ronivay build script on AlmaLinux 10.2 minimal install VM with XO commit 6a441 compiled on 2026-08-28 from master branch. FWIW, RPU functionality remains unavailable to me, though obviously, this is not a showstopper for a 4 x host home lab pool. If there is anything I can do to help resolve this, please let me know as I remain an enthusiastic proponent of the Vates virtualization stack.