@olivierlambert Ceph. There are a few configuration examples. That's how I learned it's Ceph.
Edit: When I asked the AI some questions, it said something like this: "If the chunk size is too small → the risk of a 502 increase". Seeing this, I ran a few tests. A backup of a virtual machine with 80 GB of disk space (backup size: 70 GB) went through without any problems. However, a backup of a virtual machine with 16 GB of disk space (backup size: 3 GB) resulted in a failure. It seems the 502 error occurred during the vm-clean phase of the backup. However, the backup appears to have been created and it was working when I restored. I was backing up virtual machines with large disk sizes and had never encountered this error before.
This section in the log exists both before the snapshot and after the export:
...
{
"id": "1768672615028",
"message": "clean-vm",
"start": 1768672615028,
"status": "failure",
"end": 1768673350279,
"result": {
"$metadata": {
"httpStatusCode": 502,
"clockSkewCorrected": true,
"attempts": 3,
"totalRetryDelay": 112
},
"message": "Expected closing tag 'hr' (opened in line 9, col 1) instead of closing tag 'body'.:11:1
Deserialization error: to see the raw response, inspect the hidden field {error}.$response on this object.",
"name": "Error",
"stack": "Error: Expected closing tag 'hr' (opened in line 9, col 1) instead of closing tag 'body'.:11:1
Deserialization error: to see the raw response, inspect the hidden field {error}.$response on this object.
at st.parse (/opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/fast-xml-parser/lib/fxp.cjs:1:20727)
at parseXML (/opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@aws-sdk/xml-builder/dist-cjs/xml-parser.js:17:19)
at /opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1454:52
at process.processTicksAndRejections (node:internal/process/task_queues:103:5)
at async parseXmlErrorBody (/opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1475:17)
at async de_CommandError (/opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@aws-sdk/client-s3/dist-cjs/index.js:5154:11)
at async /opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@smithy/middleware-serde/dist-cjs/index.js:8:24
at async /opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/index.js:488:18
at async /opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@smithy/middleware-retry/dist-cjs/index.js:254:46
at async /opt/xo/xo-builds/xen-orchestra-202601171930/node_modules/@aws-sdk/middleware-flexible-checksums/dist-cjs/index.js:318:18"
}
}
...
