XO error/warning: Clean VM directory. unhandled error while checking alias.

Andrew

@olivierlambert With the new XO update (Master, commit 79b87) I now see the warning/error:

When doing S3 delta backups and it does a merge. When there is no merge, there is no error.

The file it is looking for 20260529T174722Z.alias.vhd was there, but was removed by XO.

I think it 's related to @pierrebrunet 100f11308a5a0dbf7e067317dc778241efdaab5c

olivierlambert

Hi,

Please ping @julienxovates it will be more efficient

Andrew

@julienxovates Let me know if you want me to test a different branch.

FagnerMoraes

I Need some Help too.

FagnerMoraes

He is deleting the backups.

julienXOvates

Hi @andrew
Can you provide some logs ? also assuming you have this issue in the "latest" branch only ?

Andrew

@julienXOvates Correct, latest XO branch is the problem. It was fine before...

{
  "data": {
    "mode": "delta",
    "reportWhen": "never"
  },
  "id": "1780192695536",
  "jobId": "d6c0a656-62c5-4c39-a57a-f246b39f1cef",
  "jobName": "minio-test",
  "message": "backup",
  "scheduleId": "bd4ef436-fd85-4f16-bf9e-71d1d0c8586f",
  "start": 1780192695536,
  "status": "success",
  "tasks": [
    {
      "id": "0mpt4ron3-juzrilzvn0s",
      "start": 1780192697727,
      "status": "success",
      "tasks": [
        {
          "id": "0mpt4ron9-pxah6gpi19",
          "start": 1780192697733,
          "status": "success",
          "end": 1780192698044,
          "result": {
            "merge": false,
            "size": 0
          },
          "message": "clean-vm"
        },
        {
          "id": "0mpt4rpwm-ujzdf5a8ad",
          "start": 1780192699366,
          "status": "success",
          "end": 1780192700817,
          "result": "0d3f6e5e-fd58-7368-7d54-c892809927b6",
          "message": "snapshot"
        },
        {
          "id": "0mpt4rr0x-sfehspx3ey",
          "start": 1780192700817,
          "status": "success",
          "tasks": [
            {
              "id": "0mpt4rsdg-t05980lobz",
              "start": 1780192702564,
              "status": "success",
              "end": 1780192702622,
              "result": {
                "size": 43008
              },
              "message": "transfer"
            },
            {
              "id": "0mpt4rts7-5p0b0d1r94y",
              "start": 1780192704391,
              "status": "success",
              "tasks": [
                {
                  "id": "0mpt4rtvx-0rtl320os8g",
                  "start": 1780192704525,
                  "status": "success",
                  "end": 1780192704782,
                  "message": "merge"
                }
              ],
              "warnings": [
                {
                  "data": {
                    "alias": "/xo-vm-backups/a081f208-4e40-2ca5-c68e-86106af5a8ef/vdis/d6c0a656-62c5-4c39-a57a-f246b39f1cef/cbb7809e-8296-4dc6-8200-ed1f42e50c68/20260531T015641Z.alias.vhd",
                    "err": {
                      "$fault": "client",
                      "$metadata": {
                        "httpStatusCode": 404,
                        "requestId": "18B483D548936DAB",
                        "extendedRequestId": "a18350611414fa9366e109699727e695e309120afc9803fcaff78a199f9bc4d6",
                        "attempts": 1,
                        "totalRetryDelay": 0
                      },
                      "name": "NotFound",
                      "message": "UnknownError"
                    }
                  },
                  "message": "unhandled error while checking alias"
                }
              ],
              "end": 1780192704964,
              "result": {
                "merge": true,
                "size": 8235471872
              },
              "message": "clean-vm"
            }
          ],
          "end": 1780192704964,
          "message": "export",
          "data": {
            "id": "9890e0c4-ba3a-4810-8245-a49fdf16b16e",
            "isFull": false,
            "type": "remote"
          }
        }
      ],
      "infos": [
        {
          "message": "Transfer data using NBD"
        },
        {
          "message": "will delete snapshot data"
        },
        {
          "data": {
            "vdiRef": "OpaqueRef:50cca589-9c8c-478c-dac8-56debab464bb"
          },
          "message": "Snapshot data has been deleted"
        }
      ],
      "end": 1780192704964,
      "message": "backup VM",
      "data": {
        "id": "a081f208-4e40-2ca5-c68e-86106af5a8ef",
        "type": "VM",
        "name_label": "Utest"
      }
    }
  ],
  "end": 1780192704964,
  "infos": [
    {
      "data": {
        "vms": [
          "a081f208-4e40-2ca5-c68e-86106af5a8ef"
        ]
      },
      "message": "vms"
    }
  ]
}

May 30 21:58:24 xo2 xo-server[1180]: 2026-05-31T01:58:24.525Z xo:backups:MixinBackupWriter INFO Disk chain needs merging { count: 1 }
May 30 21:58:24 xo2 xo-server[1180]: 2026-05-31T01:58:24.526Z xo:backups:MixinBackupWriter INFO merging disk chain {
May 30 21:58:24 xo2 xo-server[1180]:   chain: [
May 30 21:58:24 xo2 xo-server[1180]:     '/xo-vm-backups/a081f208-4e40-2ca5-c68e-86106af5a8ef/vdis/d6c0a656-62c5-4c39-a57a-f246b39f1cef/cbb7809e-8296-4dc6-8200-ed1f42e50c68/20260531T015641Z.alias.vhd',
May 30 21:58:24 xo2 xo-server[1180]:     '/xo-vm-backups/a081f208-4e40-2ca5-c68e-86106af5a8ef/vdis/d6c0a656-62c5-4c39-a57a-f246b39f1cef/cbb7809e-8296-4dc6-8200-ed1f42e50c68/20260531T015759Z.alias.vhd'
May 30 21:58:24 xo2 xo-server[1180]:   ]
May 30 21:58:24 xo2 xo-server[1180]: }
May 30 21:58:24 xo2 xo-server[1180]: 2026-05-31T01:58:24.788Z xo:backups:MixinBackupWriter WARN unhandled error while checking alias {
May 30 21:58:24 xo2 xo-server[1180]:   alias: '/xo-vm-backups/a081f208-4e40-2ca5-c68e-86106af5a8ef/vdis/d6c0a656-62c5-4c39-a57a-f246b39f1cef/cbb7809e-8296-4dc6-8200-ed1f42e50c68/20260531T015641Z.alias.vhd',
May 30 21:58:24 xo2 xo-server[1180]:   err: NotFound: UnknownError
May 30 21:58:24 xo2 xo-server[1180]:       at S3RestXmlProtocol.handleError (/opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1850:27)
May 30 21:58:24 xo2 xo-server[1180]:       at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
May 30 21:58:24 xo2 xo-server[1180]:       at async S3RestXmlProtocol.deserializeResponse (/opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@smithy/core/dist-cjs/submodules/protocols/index.js:424:13)
May 30 21:58:24 xo2 xo-server[1180]:       at async /opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:27:24
May 30 21:58:24 xo2 xo-server[1180]:       at async /opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/index.js:387:20
May 30 21:58:24 xo2 xo-server[1180]:       at async /opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@smithy/core/dist-cjs/submodules/retry/index.js:172:50
May 30 21:58:24 xo2 xo-server[1180]:       at async /opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/index.js:64:28
May 30 21:58:24 xo2 xo-server[1180]:       at async /opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/index.js:91:20
May 30 21:58:24 xo2 xo-server[1180]:       at async /opt/xo/xo-builds/xen-orchestra-202605291150/node_modules/@aws-sdk/middleware-logger/dist-cjs/index.js:5:26
May 30 21:58:24 xo2 xo-server[1180]:       at async S3Handler._getSize (/opt/xo/xo-builds/xen-orchestra-202605291150/@xen-orchestra/fs/dist/s3.js:304:20) {
May 30 21:58:24 xo2 xo-server[1180]:     '$fault': 'client',
May 30 21:58:24 xo2 xo-server[1180]:     '$retryable': undefined,
May 30 21:58:24 xo2 xo-server[1180]:     '$metadata': {
May 30 21:58:24 xo2 xo-server[1180]:       httpStatusCode: 404,
May 30 21:58:24 xo2 xo-server[1180]:       requestId: '18B483D548936DAB',
May 30 21:58:24 xo2 xo-server[1180]:       extendedRequestId: 'a18350611414fa9366e109699727e695e309120afc9803fcaff78a199f9bc4d6',
May 30 21:58:24 xo2 xo-server[1180]:       cfId: undefined,
May 30 21:58:24 xo2 xo-server[1180]:       attempts: 1,
May 30 21:58:24 xo2 xo-server[1180]:       totalRetryDelay: 0
May 30 21:58:24 xo2 xo-server[1180]:     }
May 30 21:58:24 xo2 xo-server[1180]:   }
May 30 21:58:24 xo2 xo-server[1180]: }
May 30 21:58:24 xo2 xo-server[1180]: 2026-05-31T01:58:24.964Z xo:backups:worker INFO backup has ended