Error mirroring full backups to backblaze b2

[pedro_udifar]

Hello Florent,

The new code is still failing...

	```
	{
		"id": "0mr3li2kt-c10ifxuuw68",
		"start": 1783002246797,
		"status": "failure",
		"tasks": [
			{
				"id": "0mr3li2ud-r1vgn4rnv5d",
				"start": 1783002247141,
				"status": "failure",
				"tasks": [
					{
						"id": "0mr3li30l-6n1cr5a6o7v",
						"start": 1783002247365,
						"status": "failure",
						"end": 1783004124397,
						"result": {
							"message": "read 52428800012 bytes, maximum size allowed  is 52428800000 ",
							"name": "Error",
							"stack": "Error: read 52428800012 bytes, maximum size allowed  is 52428800000 \n    at Transform.transform [as _transform] (/opt/xo/xo-builds/xen-orchestra-202607021439/@xen-orchestra/fs/dist/s3.js:214:20)\n    at Transform._write (node:internal/streams/transform:171:8)\n    at writeOrBuffer (node:internal/streams/writable:570:12)\n    at _write (node:internal/streams/writable:499:10)\n    at Writable.write (node:internal/streams/writable:508:10)\n    at PassThrough.ondata (node:internal/streams/readable:1012:24)\n    at PassThrough.emit (node:events:509:28)\n    at PassThrough.patchedEmit [as emit] (/opt/xo/xo-builds/xen-orchestra-202607021439/@xen-orchestra/log/configure.js:52:17)\n    at addChunk (node:internal/streams/readable:563:12)\n    at readableAddChunkPushObjectMode (node:internal/streams/readable:540:3)"
						},
						"message": "transfer",
						"data": {
							"progress": 0
						}
					}
				],
				"end": 1783004124397,
				"result": {
					"message": "read 52428800012 bytes, maximum size allowed  is 52428800000 ",
					"name": "Error",
					"stack": "Error: read 52428800012 bytes, maximum size allowed  is 52428800000 \n    at Transform.transform [as _transform] (/opt/xo/xo-builds/xen-orchestra-202607021439/@xen-orchestra/fs/dist/s3.js:214:20)\n    at Transform._write (node:internal/streams/transform:171:8)\n    at writeOrBuffer (node:internal/streams/writable:570:12)\n    at _write (node:internal/streams/writable:499:10)\n    at Writable.write (node:internal/streams/writable:508:10)\n    at PassThrough.ondata (node:internal/streams/readable:1012:24)\n    at PassThrough.emit (node:events:509:28)\n    at PassThrough.patchedEmit [as emit] (/opt/xo/xo-builds/xen-orchestra-202607021439/@xen-orchestra/log/configure.js:52:17)\n    at addChunk (node:internal/streams/readable:563:12)\n    at readableAddChunkPushObjectMode (node:internal/streams/readable:540:3)"
				},
				"message": "export",
				"data": {
					"id": "14b59f44-4517-411e-9e39-4eb7136928d0",
					"type": "remote",
					"isFull": true
				}
			},
			{
				"id": "0mr3mmbcf-yc4lpd0z5p",
				"start": 1783004124399,
				"status": "success",
				"warnings": [
					{
						"data": {
							"path": "xo-vm-backups/1c842f34-f7f8-d3cd-ba24-ffe51d6ae075/cache.json.gz",
							"actual": 0,
							"expected": 1
						},
						"message": "unexpected number of entries in backup cache"
					},
					{
						"data": {
							"error": {
								"generatedMessage": false,
								"code": "ERR_ASSERTION",
								"actual": true,
								"expected": false,
								"operator": "strictEqual",
								"diff": "simple"
							}
						},
						"message": "Issue while checking XVA"
					},
					{
						"data": {
							"error": {
								"generatedMessage": false,
								"code": "ERR_ASSERTION",
								"actual": true,
								"expected": false,
								"operator": "strictEqual",
								"diff": "simple"
							}
						},
						"message": "Checksum file not valid, not blocking"
					},
					{
						"data": {
							"path": "/xo-vm-backups/1c842f34-f7f8-d3cd-ba24-ffe51d6ae075/20260624T231818Z.xva"
						},
						"message": "XVA might be broken"
					},
					{
						"data": {
							"files": [
								"20260624T231818Z.json",
								"20260624T231818Z.xva",
								"20260624T231818Z.xva.checksum"
							]
						},
						"message": "This files may be corrupted but not yet to be removed"
					}
				],
				"end": 1783004124983,
				"result": {
					"merge": false,
					"size": 0
				},
				"message": "clean-vm"
			}
		],
		"end": 1783004124983,
		"result": {
			"message": "read 52428800012 bytes, maximum size allowed  is 52428800000 ",
			"name": "Error",
			"stack": "Error: read 52428800012 bytes, maximum size allowed  is 52428800000 \n    at Transform.transform [as _transform] (/opt/xo/xo-builds/xen-orchestra-202607021439/@xen-orchestra/fs/dist/s3.js:214:20)\n    at Transform._write (node:internal/streams/transform:171:8)\n    at writeOrBuffer (node:internal/streams/writable:570:12)\n    at _write (node:internal/streams/writable:499:10)\n    at Writable.write (node:internal/streams/writable:508:10)\n    at PassThrough.ondata (node:internal/streams/readable:1012:24)\n    at PassThrough.emit (node:events:509:28)\n    at PassThrough.patchedEmit [as emit] (/opt/xo/xo-builds/xen-orchestra-202607021439/@xen-orchestra/log/configure.js:52:17)\n    at addChunk (node:internal/streams/readable:563:12)\n    at readableAddChunkPushObjectMode (node:internal/streams/readable:540:3)"
		},
		"message": "backup VM",
		"data": {
			"id": "1c842f34-f7f8-d3cd-ba24-ffe51d6ae075",
			"type": "VM",
			"progress": 0
		}
	},

Best regards,
Pedro

[florent]

@pedro_udifar that is strange that we have exactly the same error, even though we should have added 28 bytes

I pushed a little debug that will log additional lines in journalctl

'will output stream ', 'stream is encrypted' and 'stream is updated '

Can you update your branch, rebuild, rerun the transfer and post the log ( with the attached values ) ?

regards

[pedro_udifar]

@florent

Sure, but I can only do it over the weekend.
Also, I'll try to check if the script built the correct branch. First time using the script to build anything other than master.

On a side note: recently some other strange errors started to show up "Body timeout Error". These are plain full backups to a remote with disaster recovery for another cluster, that always worked fine. Also, in this case, the timeout defined within the job doesn't cancel the job and the remaining jobs in the sequence don't run. Haven't had the time to dig into this - when I do, I'll start a new forum post.

Cheers,
Pedro

[pedro_udifar]

Hello again!

Here are the logs:
b2_mirror_error.txt

Hope it helps!

[pierrebrunet]

@pedro_udifar Hi, just to be sure, this is a replication job with two s3? If yes, is the source s3 encrypted or is it only the target?

[pedro_udifar]

@pierrebrunet Hi!

Replication is from local NFS (Ztsd compressed, not encripted) to a S3 Backblaze (with encription).

[pierrebrunet]

@pedro_udifar Hi,
We think we have found two issues into one: can you test this branch please? It has the changes from previous branch you built: fix_throttled_stream

This should fix the stream issue and fix the warning.

[florent]

both fixes are now on master AND released as a patch

thank you @pedro_udifar

[pedro_udifar]

@florent

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.

fbeauchamp opened this pull request in vatesfr/xen-orchestra

closed fix(fs): compute the output stream precisely when encrypted #10061

[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.