@olivierlambert Thanks did not found that!

xcp-ng v7.6.0
xo v5.34.0 (fresh trial)

Hi,

it seems that I got VDI_IO_ERRORs during backup, only for disks on local zfs zpool Storage.
every other vms using my other local storage run the backup without problems.

Thanks in advance!

{
  "data": {
    "mode": "delta",
    "reportWhen": "failure"
  },
  "id": "1557150224133",
  "jobId": "b4dd9a7a-8e25-4128-8152-c8108f1119bb",
  "jobName": "test",
  "message": "backup",
  "scheduleId": "e1fbd723-a44e-4fa9-81cc-c9fb600eb221",
  "start": 1557150224133,
  "status": "failure",
  "tasks": [
    {
      "data": {
        "type": "VM",
        "id": "4894a4d3-f13a-a170-b127-1b6fdc060a2b"
      },
      "id": "1557150224135",
      "message": "Starting backup of nc. (b4dd9a7a-8e25-4128-8152-c8108f1119bb)",
      "start": 1557150224135,
      "status": "failure",
      "tasks": [
        {
          "id": "1557150224140",
          "message": "snapshot",
          "start": 1557150224140,
          "status": "success",
          "end": 1557150226672,
          "result": "12b0d945-4e7a-5aae-7913-31f0fa9b7597"
        },
        {
          "id": "1557150226675",
          "message": "add metadata to snapshot",
          "start": 1557150226675,
          "status": "success",
          "end": 1557150226687
        },
        {
          "id": "1557150226870",
          "message": "waiting for uptodate snapshot record",
          "start": 1557150226870,
          "status": "success",
          "end": 1557150227074
        },
        {
          "id": "1557150227077",
          "message": "start snapshot export",
          "start": 1557150227077,
          "status": "success",
          "end": 1557150227077
        },
        {
          "data": {
            "id": "4a10bddd-09ee-4830-a797-1ab4a145352b",
            "isFull": true,
            "type": "remote"
          },
          "id": "1557150227078",
          "message": "export",
          "start": 1557150227078,
          "status": "failure",
          "tasks": [
            {
              "id": "1557150227113",
              "message": "transfer",
              "start": 1557150227113,
              "status": "failure",
              "end": 1557150231817,
              "result": {
                "code": "VDI_IO_ERROR",
                "params": [
                  "Device I/O errors"
                ],
                "task": {
                  "uuid": "7d3f94fc-ec8a-eb55-0e0e-3827a9044ae0",
                  "name_label": "[XO] VDI Export",
                  "name_description": "nc_bekozu",
                  "allowed_operations": [],
                  "current_operations": {},
                  "created": "20190506T13:43:47Z",
                  "finished": "20190506T13:43:51Z",
                  "status": "failure",
                  "resident_on": "OpaqueRef:d05c0fb6-5654-417b-9e75-0976166bad04",
                  "progress": 1,
                  "type": "<none/>",
                  "result": "",
                  "error_info": [
                    "VDI_IO_ERROR",
                    "Device I/O errors"
                  ],
                  "other_config": {},
                  "subtask_of": "OpaqueRef:NULL",
                  "subtasks": [],
                  "backtrace": "(((process\"xapi @ akroma\")(filename ocaml/xapi/vhd_tool_wrapper.ml)(line 59))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process\"xapi @ akroma\")(filename ocaml/xapi/export_raw_vdi.ml)(line 47))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process\"xapi @ akroma\")(filename ocaml/xapi/export_raw_vdi.ml)(line 54)))"
                },
                "message": "VDI_IO_ERROR(Device I/O errors)",
                "name": "XapiError",
                "stack": "XapiError: VDI_IO_ERROR(Device I/O errors)\n    at Function.wrap (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/_XapiError.js:16:11)\n    at _default (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/_getTaskResult.js:11:28)\n    at Xapi._addRecordToCache (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:795:37)\n    at events.forEach.event (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:816:13)\n    at Array.forEach (<anonymous>)\n    at Xapi._processEvents (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:806:11)\n    at /usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:960:13\n    at Generator.next (<anonymous>)\n    at asyncGeneratorStep (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/dist/index.js:58:103)\n    at _next (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/dist/index.js:60:194)\n    at run (/usr/local/lib/node_modules/xo-server-xoa/node_modules/core-js/modules/es6.promise.js:75:22)\n    at /usr/local/lib/node_modules/xo-server-xoa/node_modules/core-js/modules/es6.promise.js:92:30\n    at flush (/usr/local/lib/node_modules/xo-server-xoa/node_modules/core-js/modules/_microtask.js:18:9)\n    at _combinedTickCallback (internal/process/next_tick.js:132:7)\n    at process._tickCallback (internal/process/next_tick.js:181:9)"
              }
            }
          ],
          "end": 1557150231817,
          "result": {
            "code": "VDI_IO_ERROR",
            "params": [
              "Device I/O errors"
            ],
            "task": {
              "uuid": "7d3f94fc-ec8a-eb55-0e0e-3827a9044ae0",
              "name_label": "[XO] VDI Export",
              "name_description": "nc_bekozu",
              "allowed_operations": [],
              "current_operations": {},
              "created": "20190506T13:43:47Z",
              "finished": "20190506T13:43:51Z",
              "status": "failure",
              "resident_on": "OpaqueRef:d05c0fb6-5654-417b-9e75-0976166bad04",
              "progress": 1,
              "type": "<none/>",
              "result": "",
              "error_info": [
                "VDI_IO_ERROR",
                "Device I/O errors"
              ],
              "other_config": {},
              "subtask_of": "OpaqueRef:NULL",
              "subtasks": [],
              "backtrace": "(((process\"xapi @ akroma\")(filename ocaml/xapi/vhd_tool_wrapper.ml)(line 59))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process\"xapi @ akroma\")(filename ocaml/xapi/export_raw_vdi.ml)(line 47))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process\"xapi @ akroma\")(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process\"xapi @ akroma\")(filename ocaml/xapi/export_raw_vdi.ml)(line 54)))"
            },
            "message": "VDI_IO_ERROR(Device I/O errors)",
            "name": "XapiError",
            "stack": "XapiError: VDI_IO_ERROR(Device I/O errors)\n    at Function.wrap (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/_XapiError.js:16:11)\n    at _default (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/_getTaskResult.js:11:28)\n    at Xapi._addRecordToCache (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:795:37)\n    at events.forEach.event (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:816:13)\n    at Array.forEach (<anonymous>)\n    at Xapi._processEvents (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:806:11)\n    at /usr/local/lib/node_modules/xo-server/node_modules/xen-api/src/index.js:960:13\n    at Generator.next (<anonymous>)\n    at asyncGeneratorStep (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/dist/index.js:58:103)\n    at _next (/usr/local/lib/node_modules/xo-server/node_modules/xen-api/dist/index.js:60:194)\n    at run (/usr/local/lib/node_modules/xo-server-xoa/node_modules/core-js/modules/es6.promise.js:75:22)\n    at /usr/local/lib/node_modules/xo-server-xoa/node_modules/core-js/modules/es6.promise.js:92:30\n    at flush (/usr/local/lib/node_modules/xo-server-xoa/node_modules/core-js/modules/_microtask.js:18:9)\n    at _combinedTickCallback (internal/process/next_tick.js:132:7)\n    at process._tickCallback (internal/process/next_tick.js:181:9)"
          }
        },
        {
          "id": "1557150231818",
          "message": "set snapshot.other_config[xo:backup:exported]",
          "start": 1557150231818,
          "status": "success",
          "end": 1557150231824
        }
      ],
      "end": 1557150231825
    }
  ],
  "end": 1557150231825
}