Error mirroring full backups to backblaze b2

florent

both fixes are now on master AND released as a patch

pedro_udifar

Sorry, missed your previous post. I will return to master and test it (over the weekend).

Thank you!

poddingue

Quick one to close this off: florent's fix for the encrypted-remote mirror alignment landed in a numbered release now, XO 6.6.2 (2026-07-09).
The PR was https://github.com/vatesfr/xen-orchestra/pull/10061, so it's out of master and into something you can just update to.
Did your retest come good on it?
I'm also curious whether you still need the minPartSize=100000000 setting with the fix in place, or whether that's redundant now, since it'd help us work out whether it's worth writing into the B2 docs.

pedro_udifar

@poddingue Hi,

The backup mirror job is still running, and I'm waiting for the larger VMs to complete, but so far it looks good - one backup, larger than 50GB was successfully mirrored without specifying minPartSize.

pedro_udifar

@poddingue Hi!

Unfortunately, another error came up on the larger vms. The job also seems to be painfully slow. Slower than usual I mean.
Also, it seems that job changes are not being commited. I've changed the job so it wouldn't retry in case of failure and the log shows it still trying 3 times (that was the old setting, and probably explains the job taking longer than usual).

{
  "id": "0mrjahr8e-ssawlbveq5",
  "start": 1783951215134,
  "status": "failure",
  "tasks": [
    {
      "id": "0mrjahs3e-dbfaqajeze",
      "start": 1783951216250,
      "status": "failure",
      "tasks": [
        {
          "id": "0mrjahs8s-2yb6i3fny6f",
          "start": 1783951216444,
          "status": "failure",
          "end": 1783959266484,
          "result": {
            "$fault": "server",
            "$metadata": {
              "httpStatusCode": 500,
              "requestId": "c0a9f30190109f99",
              "extendedRequestId": "aMJgyljkPZEdiEDW0Nk9lTmbINpI1FGIP",
              "attempts": 3,
              "totalRetryDelay": 197
            },
            "name": "InternalError",
            "Code": "InternalError",
            "message": "internal incident",
            "stack": "InternalError: internal incident\n    at ProtocolLib.getErrorSchemaOrThrowBaseException (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:70:67)\n    at S3RestXmlProtocol.handleError (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1856:65)\n    at S3RestXmlProtocol.deserializeResponse (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/protocols/index.js:341:24)\n    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:25:24\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:367:20\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/retry/index.js:172:50\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/checksums/dist-cjs/index.js:337:24\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:64:28\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:91:20"
          },
          "message": "transfer",
          "data": {
            "progress": 40
          }
        }
      ],
      "end": 1783959266485,
      "result": {
        "$fault": "server",
        "$metadata": {
          "httpStatusCode": 500,
          "requestId": "c0a9f30190109f99",
          "extendedRequestId": "aMJgyljkPZEdiEDW0Nk9lTmbINpI1FGIP",
          "attempts": 3,
          "totalRetryDelay": 197
        },
        "name": "InternalError",
        "Code": "InternalError",
        "message": "internal incident",
        "stack": "InternalError: internal incident\n    at ProtocolLib.getErrorSchemaOrThrowBaseException (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:70:67)\n    at S3RestXmlProtocol.handleError (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1856:65)\n    at S3RestXmlProtocol.deserializeResponse (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/protocols/index.js:341:24)\n    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:25:24\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:367:20\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/retry/index.js:172:50\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/checksums/dist-cjs/index.js:337:24\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:64:28\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:91:20"
      },
      "message": "export",
      "data": {
        "id": "14b59f44-4517-411e-9e39-4eb7136928d0",
        "type": "remote",
        "isFull": true
      }
    },
    {
      "id": "0mrjfabp3-c8mf2pnq8yf",
      "start": 1783959266487,
      "status": "success",
      "warnings": [
        {
          "data": {
            "path": "xo-vm-backups/60b4d2a7-3f91-f0f9-b0a0-f834df3ff9ee/cache.json.gz",
            "actual": 0,
            "expected": 1
          },
          "message": "unexpected number of entries in backup cache"
        }
      ],
      "end": 1783959266989,
      "result": {
        "merge": false,
        "size": 0
      },
      "message": "clean-vm"
    }
  ],
  "end": 1783959266989,
  "result": {
    "$fault": "server",
    "$metadata": {
      "httpStatusCode": 500,
      "requestId": "c0a9f30190109f99",
      "extendedRequestId": "aMJgyljkPZEdiEDW0Nk9lTmbINpI1FGIP",
      "attempts": 3,
      "totalRetryDelay": 197
    },
    "name": "InternalError",
    "Code": "InternalError",
    "message": "internal incident",
    "stack": "InternalError: internal incident\n    at ProtocolLib.getErrorSchemaOrThrowBaseException (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:70:67)\n    at S3RestXmlProtocol.handleError (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1856:65)\n    at S3RestXmlProtocol.deserializeResponse (/opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/protocols/index.js:341:24)\n    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:25:24\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:367:20\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@smithy/core/dist-cjs/submodules/retry/index.js:172:50\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/checksums/dist-cjs/index.js:337:24\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:64:28\n    at async /opt/xo/xo-builds/xen-orchestra-202607120728/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:91:20"
  },
  "message": "backup VM",
  "data": {
    "id": "60b4d2a7-3f91-f0f9-b0a0-f834df3ff9ee",
    "type": "VM",
    "progress": 0
  }
},

pierrebrunet

@pedro_udifar Hi,
This is a b2 side error. It could be just a transient error, did you try to restart the backup?

pedro_udifar

This post is deleted!

pedro_udifar

This post is deleted!

pedro_udifar

@pierrebrunet Hello!

I've checked B2 logs and found some errors like you had foreseen. I had a look and this kind of 500 INTERNAL ERROR several times on other jobs that seem ok. How many retries does XO attempt to send the part when this happens?

I'll do another run that includes only a few large VMs. BTW, is there a way to interrupt the job withou restarting XO ?

REST.PUT.PART Weekly/xo-vm-backups/60b4d2a7-3f91-f0f9-b0a0-f834df3ff9ee/20260705T070618Z.xva "PUT /zzzzzkly/xo-vm-backups/60b4d2a7-3f91-f0f9-b0a0-f834df3ff9ee/20260705T070618Z.xva?partNumber=3954&uploadId=4_ze092693d1b65962e9fe6051b_f25969add7e42e384_d20260713_m140016_c003_v0312040_t0013_u01783951216751&x-id=UploadPart HTTP/1.1" 500 INTERNAL_ERROR 145 - 3762 3762 "-" "aws-sdk-js/3.1065.0 ua/2.1 os/linux#5.15.0-185-generic lang/js md/nodejs#24.18.0 api/s3#3.1065.0 m/N,a,c,E,e xen-orchestra-fs-4.9.2" - - - TLS_AES_256_GCM_SHA384 AuthHeader s3.eu-central-003.backblazeb2.com TLSv1.3 - -

pedro_udifar

@pierrebrunet

Large VMs still fail with the same error (internal incident), the process is not reliable - don't know if it's a B2 problem or XO.
When I have some time, I'll do another run setting minPartSize=100000000 and see if it helps.

pierrebrunet

@pedro_udifar Hi,
You can try again with minPartSize=100000000 indeed. But I would advise you to contact B2 directly. They should have a clearer error to show instead of a 500.
Thanks for your patience and your help