backblaze b2 / amazon s3 as remote in xoa

shorian

@nraynaud Bizarre isn't it; I'm so very grateful for your efforts.

Some more news - it seems that one big challenge is around concurrency - things improve dramatically if concurrency is set to 1. As soon as something else is running in parallel, we run into the socket failures. I'm expanding things to try your change on another box to see if the outcomes are different - but in summary what I'm seeing so far:

Concurrency = 1 - works fine first time, fails occasionally (20% of the time?) thereafter
Concurrency > 1 - almost impossible to get it to run, but sometimes one or two VMs backup ok but not enough to be predictable and never the entire group
Anything fails - impossible to get a clean run again until the S3 target has been cleaned entirely

So it appears that somewhere there perhaps is a lock occurring when more than one stream is running, and additionally there's some kind of conflict when things have terminated prematurely and the target is therefore not in its expected state on the next run.

nraynaud

@shorian thanks, I'm a bit lost, I will read on the node.js Agent class.

shorian

@nraynaud Removing any concurrency seems to be effective; certainly a substantial improvement upon the original backup prior to your amendments.

We have managed to get things to run pretty much every time now, by running with concurrency set to '1' and being careful on the timing to ensure no other backups accidentally run in parallel.

Have checked a couple of restores and they seem to be ok too.

Only thing I would highlight is that now I am not getting the failures, I cannot tell if the issue on the remote when recovering from a partial/failed backup is resolved. I guess this needs me to pull a plug on the network whilst back up is running but I would need to test this on a different machine in the lab rather than where we're running at the moment.

shorian

Ok, spent weekend having backups running continuously across a number of boxes.

Good news - the fix seems to have solved things, providing one only ever uses concurrency “1” and there are no conflicting or overlapping backups.

Restores are working fine for me too.

In short @nraynaud - it’s a substantial improvement and for me makes this now usable. A huge thank you.

olivierlambert

Thanks for the feeback @shorian !

nraynaud

@shorian I would like to abuse your patience again, by asking you to test this branch: https://github.com/vatesfr/xen-orchestra/tree/nr-s3-fix-big-backups2

The concept is that the backup upload will happen without any sort of smart upload system or queue.

Thank you, Nico

shorian

@nraynaud Building XO now; will run a few backups overnight.

Anything in particular you'd like me to look for / test ?

nraynaud

@shorian thanks. If you could just try no concurrency as a proof that the code work, then your normal concurrency, to check if the issue is fixed that would be great.

This code is meant to be more vulnerable to losing the connection to S3, but I think it's a low risk. It's now using straight HTTP POST.

shorian

@nraynaud Bit of a hiccup I'm afraid ; errors out with "Not Implemented":

{
  "data": {
    "mode": "full",
    "reportWhen": "failure"
  },
  "id": "1615570162008",
  "jobId": "b947a31c-35f7-45d9-af88-628ec027c71e",
  "jobName": "B2",
  "message": "backup",
  "scheduleId": "8481e1b8-3d22-4502-abb7-9f0413aca0a3",
  "start": 1615570162008,
  "status": "pending",
  "infos": [
    {
      "data": {
        "vms": [
          "25a4e2a6-b116-7cee-b94b-f3553fe001f2",
          "24103ce1-e47b-fe12-4029-d643e0382f08",
          "60ac886d-8adf-9e21-4baa-b14e0fc1b2bb"
        ]
      },
      "message": "vms"
    }
  ],
  "tasks": [
    {
      "data": {
        "type": "VM",
        "id": "25a4e2a6-b116-7cee-b94b-f3553fe001f2"
      },
      "id": "1615570162050",
      "message": "backup VM",
      "start": 1615570162050,
      "status": "pending",
      "tasks": [
        {
          "id": "1615570162064",
          "message": "snapshot",
          "start": 1615570162064,
          "status": "success",
          "end": 1615570163265,
          "result": "294d65fc-ddc7-b8ad-68b8-d14e36b6838e"
        },
        {
          "data": {
            "id": "df07dd6b-753e-40f2-89be-75404bac2c1e",
            "type": "remote",
            "isFull": true
          },
          "id": "1615570163286",
          "message": "export",
          "start": 1615570163286,
          "status": "failure",
          "tasks": [
            {
              "id": "1615570164234",
              "message": "transfer",
              "start": 1615570164234,
              "status": "failure",
              "end": 1615570164257,
              "result": {
                "message": "Not implemented",
                "name": "Error",
                "stack": "Error: Not implemented\n    at S3Handler._createWriteStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/fs/src/abstract.js:428:11)\n    at S3Handler._createOutputStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/fs/src/abstract.js:412:25)\n    at S3Handler.createOutputStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/fs/src/abstract.js:129:12)\n    at RemoteAdapter.outputStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/RemoteAdapter.js:513:34)\n    at /opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/_FullBackupWriter.js:70:7\n    at FullBackupWriter.run (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/_FullBackupWriter.js:69:5)\n    at Array.<anonymous> (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/_VmBackup.js:209:9)"
              }
            }
          ],
          "end": 1615570164258,
          "result": {
            "message": "Not implemented",
            "name": "Error",
            "stack": "Error: Not implemented\n    at S3Handler._createWriteStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/fs/src/abstract.js:428:11)\n    at S3Handler._createOutputStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/fs/src/abstract.js:412:25)\n    at S3Handler.createOutputStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/fs/src/abstract.js:129:12)\n    at RemoteAdapter.outputStream (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/RemoteAdapter.js:513:34)\n    at /opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/_FullBackupWriter.js:70:7\n    at FullBackupWriter.run (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/_FullBackupWriter.js:69:5)\n    at Array.<anonymous> (/opt/xo/xo-builds/xen-orchestra-202103121606/@xen-orchestra/backups/_VmBackup.js:209:9)"
          }
        }
      ]
    }
  ]
}

I'll try over the weekend with a fresh install. Backing up to Backblaze B2 rather than S3 - likely to be the issue?

nraynaud

@shorian Ah sorry, I think S3 is completely broken at the moment.

shorian

@nraynaud Getting the "not implemented" error on all branches at the moment - is there a functioning, albeit not perfect branch that we can run with as a temporary measure? Thanks chap

yomono

Is this still broken on all branches?
It's a shame, it was working relatively fine when used carefully

olivierlambert

@julien-f and @nraynaud are working on it. That's why it's still called beta But we should have soon something on track.

shorian

New S3 function (albeit using Backblaze) seems to be working really well for small backups; I'm now seeing almost 100% success.

However larger backups are consistently failing with

"message": "Error calling AWS.S3.upload: aborted",
            "name": "Error",
            "stack": "Error: Error calling AWS.S3.upload: aborted\n    at rethrow (/opt/xo/xo-builds/xen-orchestra-202105081131/node_modules/@sullux/aws-sdk/index.js:254:24)\n    at runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:93:5)\n    at async S3Handler._outputStream (/opt/xo/xo-builds/xen-orchestra-202105081131/@xen-orchestra/fs/dist/s3.js:100:5)\n    at async S3Handler.outputStream (/opt/xo/xo-builds/xen-orchestra-202105081131/@xen-orchestra/fs/dist/abstract.js:250:5)\n    at async RemoteAdapter.outputStream (/opt/xo/xo-builds/xen-orchestra-202105081131/@xen-orchestra/backups/RemoteAdapter.js:509:5)\n    at async /opt/xo/xo-builds/xen-orchestra-202105081131/@xen-orchestra/backups/writers/FullBackupWriter.js:69:7"

Running with xo-server 5.79.3 , xo-web 5.81.0

I'm having the same issue across different buckets in B2 and from different servers.

Any ideas?

shorian

As an aside, using the same build I am also getting problems when running CR over a slower WAN, with the following error. Just mentioning it here in case it's related.

"message": "VDI_IO_ERROR(Device I/O errors)",
            "name": "XapiError",
            "stack": "XapiError: VDI_IO_ERROR(Device I/O errors)\n    at Function.wrap (/opt/xo/xo-builds/xen-orchestra-202105081131/packages/xen-api/dist/_XapiError.js:26:12)\n    at _default (/opt/xo/xo-builds/xen-orchestra-202105081131/packages/xen-api/dist/_getTaskResult.js:24:38)\n    at Xapi._addRecordToCache (/opt/xo/xo-builds/xen-orchestra-202105081131/packages/xen-api/dist/index.js:761:51)\n    at /opt/xo/xo-builds/xen-orchestra-202105081131/packages/xen-api/dist/index.js:789:14\n    at Array.forEach (<anonymous>)\n    at Xapi._processEvents (/opt/xo/xo-builds/xen-orchestra-202105081131/packages/xen-api/dist/index.js:774:12)\n    at Xapi._watchEvents (/opt/xo/xo-builds/xen-orchestra-202105081131/packages/xen-api/dist/index.js:931:14)\n    at runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:93:5)"
          }
        }
      ],
      "end": 1620864312824,
      "result": {
        "message": "all targets have failed, step: writer.transfer()",
        "name": "Error",
        "stack": "Error: all targets have failed, step: writer.transfer()\n    at VmBackup._callWriters (/opt/xo/xo-builds/xen-orchestra-202105081131/@xen-orchestra/backups/_VmBackup.js:118:13)\n    at runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:93:5)\n    at async VmBackup._copyDelta (/opt/xo/xo-builds/xen-orchestra-202105081131/@xen-orchestra/backups/_VmBackup.js:190:5)\n    at async VmBackup.run (/opt/xo/xo-builds/xen-orchestra-202105081131/@xen-orchestra/backups/_VmBackup.js:371:9)"

CR to a local machine is working fine, the remote one is failing every iteration.

olivierlambert

Thanks for your feedback

@julien-f is working on that

shorian