Copy/Sync of large files to pCloud always failing

What is the problem you are having with rclone?

Copy/Sync of large files i.e. 1 Gb always fails with the following message:

Failed to copy: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456

It's reproducible. Tried with different large files. Always the same result. The uploaded file is moved to the pCloud trash. The trashed files are completely ok. Obviously there is a delay on the pCloud side in updating the file size so that rClone is getting a zero file size returned.

Run the command 'rclone version' and share the full output of the command.

2024/10/21 21:15:46 ERROR : AVeryLargeFile.dvdmedia/VIDEO_TS/VTS_04_1.VOB: Failed to copy: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456
2024/10/21 21:15:46 ERROR : pcloud root 'Medien/Filme': not deleting files as there were IO errors
2024/10/21 21:15:46 ERROR : pcloud root 'Medien/Filme': not deleting directories as there were IO errors
2024/10/21 21:15:46 ERROR : Attempt 1/3 failed with 1 errors and: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456
Transferred: 1023.578 MiB / 1023.578 MiB, 100%, 138.634 KiB/s, ETA 0s
Checks: 607 / 651, 93%
Elapsed time: 13m26.6s

Are you on the latest version of rclone? You can validate by checking the version listed here: Rclone downloads
-->

rclone v1.68.1

  • os/version: raspbian 12.7 (64 bit)
  • os/kernel: 6.6.51+rpt-rpi-2712 (aarch64)
  • os/type: linux
  • os/arch: arm64 (ARMv8 compatible)
  • go/version: go1.23.1
  • go/linking: static
  • go/tags: none

pCloud

The command you were trying to run (eg rclone copy /tmp remote:tmp)

flock /tmp/syncMedien.lock --command "rclone sync -P '/home/xxx/yyy/zzz' 'pCloud:Medien/zzz' --filter-from ignore.txt --no
-update-modtime"

Please run 'rclone config redacted' and share the full output. If you get command not found, please make sure to update rclone.

[Jo]
type = crypt
remote = pCloud:Jo
password = XXX
filename_encryption = off
directory_name_encryption = false

[pCloud]
type = pcloud
hostname = eapi.pcloud.com
token = XXX

A log from the command that you were trying to run with the -vv flag

if necessary I will submit the log later

welcome to the forum,

how did you confirm that?


please copy a single file and post the full debug log?
can use --retries=1

I tried also the option --inplace - but makes no difference.

I will post -vv log tomorrow as i dont have the time now to wait for the copy to finish.

I also wanted to check from which size on the problem occurs. A few hundred Mb seem not to be a problem.

what i find a little confusing is that the error is about multi-thread
but from the rcone docs, pcloud does not support MultithreadUpload

edit: i just noticed from the changelog that multi-thread uploads was just enabled recently
Implement OpenWriterAt feature to enable multipart uploads

in the past, did you use an older version of rclone, that did not have this issue or you just started using rclone with v1.68.1 ?

so, i might test a version of rclone, older than v1.68.0

I just startet using rclone and pCloud.

As the transfer has been already finished - here the -vv output.

flock /tmp/syncMedien.lock --command "rclone sync -Pvv '/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedi
a/VIDEO_TS/VTS_04_1.VOB' 'pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/' --filter-from ignore.txt --no-update-
modtime --retries=1"
2024/10/21 21:58:06 DEBUG : rclone: Version "v1.68.1" starting with parameters ["rclone" "sync" "-Pvv" "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/VTS_04_1.VOB" "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/" "--filter-from" "ignore.txt" "--no-update-modtime" "--retries=1"]
2024/10/21 21:58:06 DEBUG : Creating backend with remote "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/VTS_04_1.VOB"
2024/10/21 21:58:06 DEBUG : Using config file from "/home/jojo/.config/rclone/rclone.conf"
2024/10/21 21:58:06 DEBUG : fs cache: adding new entry for parent of "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/VTS_04_1.VOB", "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS"
2024/10/21 21:58:06 DEBUG : Creating backend with remote "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/"
2024/10/21 21:58:08 DEBUG : fs cache: renaming cache item "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/" to be canonical "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS"
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: Need to transfer - File not found at Destination
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: multi-thread copy: write buffer set to 131072
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: Starting multi-thread copy with 16 chunks of size 64Mi with 4 parallel streams
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 4/16 (201326592-268435456) size 64Mi starting
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 1/16 (0-67108864) size 64Mi starting
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 2/16 (67108864-134217728) size 64Mi starting
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 3/16 (134217728-201326592) size 64Mi starting
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 3
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 0
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 2
2024/10/21 21:58:08 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 1
2024/10/21 22:00:06 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 4/16 (201326592-268435456) size 64Mi finished
2024/10/21 22:00:06 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 5/16 (268435456-335544320) size 64Mi starting
2024/10/21 22:00:06 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 4
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 1/16 (0-67108864) size 64Mi finished
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 6/16 (335544320-402653184) size 64Mi starting
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 5
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 3/16 (134217728-201326592) size 64Mi finished
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 7/16 (402653184-469762048) size 64Mi starting
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 6
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 2/16 (67108864-134217728) size 64Mi finished
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 8/16 (469762048-536870912) size 64Mi starting
2024/10/21 22:00:07 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 7
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 5/16 (268435456-335544320) size 64Mi finished
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 9/16 (536870912-603979776) size 64Mi starting
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 8
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 6/16 (335544320-402653184) size 64Mi finished
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 10/16 (603979776-671088640) size 64Mi starting
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 9
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 7/16 (402653184-469762048) size 64Mi finished
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 11/16 (671088640-738197504) size 64Mi starting
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 10
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 8/16 (469762048-536870912) size 64Mi finished
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 12/16 (738197504-805306368) size 64Mi starting
2024/10/21 22:02:12 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 11
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 9/16 (536870912-603979776) size 64Mi finished
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 13/16 (805306368-872415232) size 64Mi starting
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 12
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 10/16 (603979776-671088640) size 64Mi finished
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 14/16 (872415232-939524096) size 64Mi starting
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 13
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 11/16 (671088640-738197504) size 64Mi finished
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 15/16 (939524096-1006632960) size 64Mi starting
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 14
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 12/16 (738197504-805306368) size 64Mi finished
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 16/16 (1006632960-1073299456) size 63.578Mi starting
2024/10/21 22:04:14 DEBUG : VTS_04_1.VOB.fa329ff8.partial: writing chunk 15
2024/10/21 22:06:09 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 16/16 (1006632960-1073299456) size 63.578Mi finished
2024/10/21 22:06:09 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 13/16 (805306368-872415232) size 64Mi finished
2024/10/21 22:06:09 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 14/16 (872415232-939524096) size 64Mi finished
2024/10/21 22:06:09 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 15/16 (939524096-1006632960) size 64Mi finished
2024/10/21 22:06:09 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 0/5
2024/10/21 22:06:10 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 1/5
2024/10/21 22:06:11 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 2/5
2024/10/21 22:06:12 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 3/5
2024/10/21 22:06:13 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 4/5
2024/10/21 22:06:15 DEBUG : VTS_04_1.VOB: multi-thread copy: cancelling transfer on exit
2024/10/21 22:06:15 ERROR : VTS_04_1.VOB: Failed to copy: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456
2024/10/21 22:06:15 ERROR : Attempt 1/1 failed with 1 errors and: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456
Transferred: 1023.578 MiB / 1023.578 MiB, 100%, 1.505 MiB/s, ETA 0s
Errors: 1 (retrying may help)
Elapsed time: 8m8.3s
2024/10/21 22:06:15 INFO :
Transferred: 1023.578 MiB / 1023.578 MiB, 100%, 1.505 MiB/s, ETA 0s
Errors: 1 (retrying may help)
Elapsed time: 8m8.3s

2024/10/21 22:06:15 DEBUG : 7 go routines active
2024/10/21 22:06:15 NOTICE: Failed to sync: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456

By the way - thanks for looking into this... !!!

weclome.

going forward, use --inplace. just one less potential issue to deal with

Ok - here the log with --inplace.

If you move the transfered file from the trash to a different location and remove the xyzabc.partial ending of the trashed file it is always fully functional.

Good night - i have to leave now. And thanks again for digging into this problem.

flock /tmp/syncMedien.lock --command "rclone sync -Pvv '/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/VTS_04_1.VOB' 'pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/' --filter-from ignore.txt --no-update-modtime --retries=1 --inplace"
2024/10/21 22:21:12 DEBUG : rclone: Version "v1.68.1" starting with parameters ["rclone" "sync" "-Pvv" "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/VTS_04_1.VOB" "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/" "--filter-from" "ignore.txt" "--no-update-modtime" "--retries=1" "--inplace"]
2024/10/21 22:21:12 DEBUG : Creating backend with remote "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/VTS_04_1.VOB"
2024/10/21 22:21:12 DEBUG : Using config file from "/home/jojo/.config/rclone/rclone.conf"
2024/10/21 22:21:12 DEBUG : fs cache: adding new entry for parent of "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/VTS_04_1.VOB", "/home/jojo/Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS"
2024/10/21 22:21:12 DEBUG : Creating backend with remote "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/"
2024/10/21 22:21:12 DEBUG : fs cache: renaming cache item "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS/" to be canonical "pCloud:Medien/Filme/Shaun das Schaf/Shaun das Schaf (Waschtag).dvdmedia/VIDEO_TS"
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: Need to transfer - File not found at Destination
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: multi-thread copy: write buffer set to 131072
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: Starting multi-thread copy with 16 chunks of size 64Mi with 4 parallel streams
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 4/16 (201326592-268435456) size 64Mi starting
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 1/16 (0-67108864) size 64Mi starting
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 3/16 (134217728-201326592) size 64Mi starting
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 2/16 (67108864-134217728) size 64Mi starting
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: writing chunk 3
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: writing chunk 0
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: writing chunk 2
2024/10/21 22:21:12 DEBUG : VTS_04_1.VOB: writing chunk 1
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 4/16 (201326592-268435456) size 64Mi finished
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 5/16 (268435456-335544320) size 64Mi starting
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: writing chunk 4
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 1/16 (0-67108864) size 64Mi finished
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 6/16 (335544320-402653184) size 64Mi starting
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: writing chunk 5
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 3/16 (134217728-201326592) size 64Mi finished
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 7/16 (402653184-469762048) size 64Mi starting
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: writing chunk 6
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 2/16 (67108864-134217728) size 64Mi finished
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 8/16 (469762048-536870912) size 64Mi starting
2024/10/21 22:22:58 DEBUG : VTS_04_1.VOB: writing chunk 7
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 5/16 (268435456-335544320) size 64Mi finished
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 9/16 (536870912-603979776) size 64Mi starting
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: writing chunk 8
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 6/16 (335544320-402653184) size 64Mi finished
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 10/16 (603979776-671088640) size 64Mi starting
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: writing chunk 9
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 7/16 (402653184-469762048) size 64Mi finished
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 11/16 (671088640-738197504) size 64Mi starting
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: writing chunk 10
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 8/16 (469762048-536870912) size 64Mi finished
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 12/16 (738197504-805306368) size 64Mi starting
2024/10/21 22:24:47 DEBUG : VTS_04_1.VOB: writing chunk 11
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 9/16 (536870912-603979776) size 64Mi finished
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 13/16 (805306368-872415232) size 64Mi starting
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: writing chunk 12
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 10/16 (603979776-671088640) size 64Mi finished
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 14/16 (872415232-939524096) size 64Mi starting
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: writing chunk 13
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 11/16 (671088640-738197504) size 64Mi finished
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 15/16 (939524096-1006632960) size 64Mi starting
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: writing chunk 14
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 12/16 (738197504-805306368) size 64Mi finished
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 16/16 (1006632960-1073299456) size 63.578Mi starting
2024/10/21 22:26:34 DEBUG : VTS_04_1.VOB: writing chunk 15
2024/10/21 22:28:20 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 16/16 (1006632960-1073299456) size 63.578Mi finished
2024/10/21 22:28:20 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 13/16 (805306368-872415232) size 64Mi finished
2024/10/21 22:28:20 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 14/16 (872415232-939524096) size 64Mi finished
2024/10/21 22:28:20 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 15/16 (939524096-1006632960) size 64Mi finished
2024/10/21 22:28:20 DEBUG : VTS_04_1.VOB: checking file size: try 0/5
2024/10/21 22:28:21 DEBUG : VTS_04_1.VOB: checking file size: try 1/5
2024/10/21 22:28:22 DEBUG : VTS_04_1.VOB: checking file size: try 2/5
2024/10/21 22:28:23 DEBUG : VTS_04_1.VOB: checking file size: try 3/5
2024/10/21 22:28:24 DEBUG : VTS_04_1.VOB: checking file size: try 4/5
2024/10/21 22:28:25 DEBUG : VTS_04_1.VOB: multi-thread copy: cancelling transfer on exit
2024/10/21 22:28:25 ERROR : VTS_04_1.VOB: Failed to copy: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456
2024/10/21 22:28:25 ERROR : Attempt 1/1 failed with 1 errors and: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456
Transferred: 1023.578 MiB / 1023.578 MiB, 100%, 1.627 MiB/s, ETA 0s
Errors: 1 (retrying may help)
Elapsed time: 7m13.5s
2024/10/21 22:28:25 INFO :
Transferred: 1023.578 MiB / 1023.578 MiB, 100%, 1.627 MiB/s, ETA 0s
Errors: 1 (retrying may help)
Elapsed time: 7m13.5s

2024/10/21 22:28:25 DEBUG : 7 go routines active
2024/10/21 22:28:25 NOTICE: Failed to sync: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456
jojo@Raspi5:~

To tear down the problem i have created test files with sizes between 300 and 900 Mb using dd.

Tried the transfer 3 times. Result is a bit surprising!

In the first attempt the 700 and 800 Mb files had problems, in the second attempt is was the 500 Mb file and in the third the 800 Mb file.
So in conclusion i would say transfer is reliable at least up to sizes with 400 Mb. Above the transfer may fail - or not. Astonishingly was the biggest file with 900 Mb transfered in all 3 cases.

Here are the log of the first attempt (only this one because of the character limit of the post).

...
2024/10/22 11:11:26 DEBUG : Creating backend with remote "/home/jojo/Medien/test"
2024/10/22 11:11:26 DEBUG : Using config file from "/home/jojo/.config/rclone/rclone.conf"
2024/10/22 11:11:26 DEBUG : Creating backend with remote "pCloud:Medien/test"
2024/10/22 11:11:27 DEBUG : upload_test_300: Need to transfer - File not found at Destination
2024/10/22 11:11:27 DEBUG : upload_test_400: Need to transfer - File not found at Destination
2024/10/22 11:11:27 DEBUG : upload_test_500: Need to transfer - File not found at Destination
2024/10/22 11:11:27 DEBUG : upload_test_600: Need to transfer - File not found at Destination
2024/10/22 11:11:27 DEBUG : upload_test_700: Need to transfer - File not found at Destination
2024/10/22 11:11:27 DEBUG : upload_test_800: Need to transfer - File not found at Destination
2024/10/22 11:11:27 DEBUG : upload_test_900: Need to transfer - File not found at Destination
2024/10/22 11:11:27 DEBUG : pcloud root 'Medien/test': Waiting for checks to finish
2024/10/22 11:11:27 DEBUG : pcloud root 'Medien/test': Waiting for transfers to finish
2024/10/22 11:11:27 DEBUG : upload_test_300: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/22 11:11:27 DEBUG : upload_test_400: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/22 11:11:27 DEBUG : upload_test_500: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/22 11:11:27 DEBUG : upload_test_600: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/22 11:11:27 DEBUG : upload_test_300: multi-thread copy: write buffer set to 131072
2024/10/22 11:11:27 DEBUG : upload_test_300: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/22 11:11:27 DEBUG : upload_test_300: Starting multi-thread copy with 5 chunks of size 64Mi with 4 parallel streams
2024/10/22 11:11:27 DEBUG : upload_test_300: multi-thread copy: chunk 4/5 (201326592-268435456) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_300: multi-thread copy: chunk 1/5 (0-67108864) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_300: multi-thread copy: chunk 2/5 (67108864-134217728) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_300: multi-thread copy: chunk 3/5 (134217728-201326592) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_300.48f032b5.partial: writing chunk 3
2024/10/22 11:11:27 DEBUG : upload_test_400: multi-thread copy: write buffer set to 131072
2024/10/22 11:11:27 DEBUG : upload_test_400: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/22 11:11:27 DEBUG : upload_test_400: Starting multi-thread copy with 7 chunks of size 64Mi with 4 parallel streams
2024/10/22 11:11:27 DEBUG : upload_test_400: multi-thread copy: chunk 4/7 (201326592-268435456) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_400: multi-thread copy: chunk 1/7 (0-67108864) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_400: multi-thread copy: chunk 2/7 (67108864-134217728) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_400: multi-thread copy: chunk 3/7 (134217728-201326592) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_400.5d7708c6.partial: writing chunk 3
2024/10/22 11:11:27 DEBUG : upload_test_500: multi-thread copy: write buffer set to 131072
2024/10/22 11:11:27 DEBUG : upload_test_500: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/22 11:11:27 DEBUG : upload_test_500: Starting multi-thread copy with 8 chunks of size 64Mi with 4 parallel streams
2024/10/22 11:11:27 DEBUG : upload_test_500: multi-thread copy: chunk 4/8 (201326592-268435456) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_500: multi-thread copy: chunk 2/8 (67108864-134217728) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_500: multi-thread copy: chunk 3/8 (134217728-201326592) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_500: multi-thread copy: chunk 1/8 (0-67108864) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_300.48f032b5.partial: writing chunk 0
2024/10/22 11:11:27 DEBUG : upload_test_300.48f032b5.partial: writing chunk 1
2024/10/22 11:11:27 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 3
2024/10/22 11:11:27 DEBUG : upload_test_400.5d7708c6.partial: writing chunk 1
2024/10/22 11:11:27 DEBUG : upload_test_400.5d7708c6.partial: writing chunk 0
2024/10/22 11:11:27 DEBUG : upload_test_600: multi-thread copy: write buffer set to 131072
2024/10/22 11:11:27 DEBUG : upload_test_600: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/22 11:11:27 DEBUG : upload_test_600: Starting multi-thread copy with 10 chunks of size 64Mi with 4 parallel streams
2024/10/22 11:11:27 DEBUG : upload_test_600: multi-thread copy: chunk 4/10 (201326592-268435456) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_600: multi-thread copy: chunk 2/10 (67108864-134217728) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_600: multi-thread copy: chunk 1/10 (0-67108864) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_600: multi-thread copy: chunk 3/10 (134217728-201326592) size 64Mi starting
2024/10/22 11:11:27 DEBUG : upload_test_600.f8a87935.partial: writing chunk 3
2024/10/22 11:11:27 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 2
2024/10/22 11:11:27 DEBUG : upload_test_300.48f032b5.partial: writing chunk 2
2024/10/22 11:11:27 DEBUG : upload_test_400.5d7708c6.partial: writing chunk 2
2024/10/22 11:11:27 DEBUG : upload_test_600.f8a87935.partial: writing chunk 0
2024/10/22 11:11:27 DEBUG : upload_test_600.f8a87935.partial: writing chunk 1
2024/10/22 11:11:27 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 1
2024/10/22 11:11:27 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 0
2024/10/22 11:11:27 DEBUG : upload_test_600.f8a87935.partial: writing chunk 2
2024/10/22 11:12:52 DEBUG : upload_test_300: multi-thread copy: chunk 2/5 (67108864-134217728) size 64Mi finished
2024/10/22 11:12:52 DEBUG : upload_test_300: multi-thread copy: chunk 5/5 (268435456-314572800) size 44Mi starting
2024/10/22 11:12:52 DEBUG : upload_test_300.48f032b5.partial: writing chunk 4
2024/10/22 11:12:52 DEBUG : upload_test_300: multi-thread copy: chunk 1/5 (0-67108864) size 64Mi finished
2024/10/22 11:12:52 DEBUG : upload_test_300: multi-thread copy: chunk 3/5 (134217728-201326592) size 64Mi finished
2024/10/22 11:12:52 DEBUG : upload_test_400: multi-thread copy: chunk 1/7 (0-67108864) size 64Mi finished
2024/10/22 11:12:52 DEBUG : upload_test_400: multi-thread copy: chunk 5/7 (268435456-335544320) size 64Mi starting
2024/10/22 11:12:52 DEBUG : upload_test_400.5d7708c6.partial: writing chunk 4
2024/10/22 11:12:52 DEBUG : upload_test_400: multi-thread copy: chunk 2/7 (67108864-134217728) size 64Mi finished
2024/10/22 11:12:52 DEBUG : upload_test_400: multi-thread copy: chunk 6/7 (335544320-402653184) size 64Mi starting
2024/10/22 11:12:52 DEBUG : upload_test_400.5d7708c6.partial: writing chunk 5
2024/10/22 11:12:52 DEBUG : upload_test_400: multi-thread copy: chunk 3/7 (134217728-201326592) size 64Mi finished
2024/10/22 11:12:52 DEBUG : upload_test_400: multi-thread copy: chunk 7/7 (402653184-419430400) size 16Mi starting
2024/10/22 11:12:52 DEBUG : upload_test_400.5d7708c6.partial: writing chunk 6
2024/10/22 11:12:54 DEBUG : upload_test_500: multi-thread copy: chunk 2/8 (67108864-134217728) size 64Mi finished
2024/10/22 11:12:54 DEBUG : upload_test_500: multi-thread copy: chunk 5/8 (268435456-335544320) size 64Mi starting
2024/10/22 11:12:54 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 4
2024/10/22 11:12:54 DEBUG : upload_test_500: multi-thread copy: chunk 1/8 (0-67108864) size 64Mi finished
2024/10/22 11:12:54 DEBUG : upload_test_500: multi-thread copy: chunk 6/8 (335544320-402653184) size 64Mi starting
2024/10/22 11:12:54 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 5
2024/10/22 11:12:55 DEBUG : upload_test_500: multi-thread copy: chunk 3/8 (134217728-201326592) size 64Mi finished
2024/10/22 11:12:55 DEBUG : upload_test_500: multi-thread copy: chunk 7/8 (402653184-469762048) size 64Mi starting
2024/10/22 11:12:55 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 6
2024/10/22 11:12:55 DEBUG : upload_test_600: multi-thread copy: chunk 1/10 (0-67108864) size 64Mi finished
2024/10/22 11:12:55 DEBUG : upload_test_600: multi-thread copy: chunk 5/10 (268435456-335544320) size 64Mi starting
2024/10/22 11:12:55 DEBUG : upload_test_600.f8a87935.partial: writing chunk 4
2024/10/22 11:12:55 DEBUG : upload_test_600: multi-thread copy: chunk 2/10 (67108864-134217728) size 64Mi finished
2024/10/22 11:12:55 DEBUG : upload_test_600: multi-thread copy: chunk 6/10 (335544320-402653184) size 64Mi starting
2024/10/22 11:12:55 DEBUG : upload_test_600.f8a87935.partial: writing chunk 5
2024/10/22 11:12:55 DEBUG : upload_test_600: multi-thread copy: chunk 3/10 (134217728-201326592) size 64Mi finished
2024/10/22 11:12:55 DEBUG : upload_test_600: multi-thread copy: chunk 7/10 (402653184-469762048) size 64Mi starting
2024/10/22 11:12:55 DEBUG : upload_test_600.f8a87935.partial: writing chunk 6
2024/10/22 11:13:30 DEBUG : upload_test_300: multi-thread copy: chunk 4/5 (201326592-268435456) size 64Mi finished
2024/10/22 11:13:30 DEBUG : upload_test_400: multi-thread copy: chunk 4/7 (201326592-268435456) size 64Mi finished
2024/10/22 11:13:30 DEBUG : upload_test_400: multi-thread copy: chunk 7/7 (402653184-419430400) size 16Mi finished
2024/10/22 11:13:32 DEBUG : upload_test_500: multi-thread copy: chunk 4/8 (201326592-268435456) size 64Mi finished
2024/10/22 11:13:32 DEBUG : upload_test_500: multi-thread copy: chunk 8/8 (469762048-524288000) size 52Mi starting
2024/10/22 11:13:32 DEBUG : upload_test_500.cd80c43a.partial: writing chunk 7
2024/10/22 11:13:33 DEBUG : upload_test_600: multi-thread copy: chunk 4/10 (201326592-268435456) size 64Mi finished
2024/10/22 11:13:33 DEBUG : upload_test_600: multi-thread copy: chunk 8/10 (469762048-536870912) size 64Mi starting
2024/10/22 11:13:33 DEBUG : upload_test_600.f8a87935.partial: writing chunk 7
2024/10/22 11:13:59 DEBUG : upload_test_400: multi-thread copy: chunk 5/7 (268435456-335544320) size 64Mi finished
2024/10/22 11:13:59 DEBUG : upload_test_400: multi-thread copy: chunk 6/7 (335544320-402653184) size 64Mi finished
2024/10/22 11:13:59 DEBUG : upload_test_400.5d7708c6.partial: checking file size: try 0/5
2024/10/22 11:14:01 DEBUG : upload_test_400.5d7708c6.partial: checking file size: try 1/5
2024/10/22 11:14:02 DEBUG : upload_test_400.5d7708c6.partial: checking file size: try 2/5
2024/10/22 11:14:02 DEBUG : upload_test_500: multi-thread copy: chunk 5/8 (268435456-335544320) size 64Mi finished
2024/10/22 11:14:02 DEBUG : upload_test_500: multi-thread copy: chunk 6/8 (335544320-402653184) size 64Mi finished
2024/10/22 11:14:02 DEBUG : upload_test_600: multi-thread copy: chunk 5/10 (268435456-335544320) size 64Mi finished
2024/10/22 11:14:02 DEBUG : upload_test_600: multi-thread copy: chunk 9/10 (536870912-603979776) size 64Mi starting
2024/10/22 11:14:02 DEBUG : upload_test_600.f8a87935.partial: writing chunk 8
2024/10/22 11:14:02 DEBUG : upload_test_600: multi-thread copy: chunk 6/10 (335544320-402653184) size 64Mi finished
2024/10/22 11:14:02 DEBUG : upload_test_600: multi-thread copy: chunk 10/10 (603979776-629145600) size 24Mi starting
2024/10/22 11:14:02 DEBUG : upload_test_600.f8a87935.partial: writing chunk 9
2024/10/22 11:14:03 DEBUG : upload_test_400.5d7708c6.partial: checking file size: try 3/5
2024/10/22 11:14:03 DEBUG : upload_test_400: Finished multi-thread copy with 7 parts of size 64Mi
2024/10/22 11:14:08 DEBUG : upload_test_400: sha1 = 954fab188c40b997ae30028ea58d7fa81778916f OK
2024/10/22 11:14:08 DEBUG : upload_test_400.5d7708c6.partial: renamed to: upload_test_400
2024/10/22 11:14:08 INFO : upload_test_400: Multi-thread Copied (new)
2024/10/22 11:14:08 DEBUG : upload_test_700: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/22 11:14:08 DEBUG : upload_test_700: multi-thread copy: write buffer set to 131072
2024/10/22 11:14:08 DEBUG : upload_test_700: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/22 11:14:08 DEBUG : upload_test_700: Starting multi-thread copy with 11 chunks of size 64Mi with 4 parallel streams
2024/10/22 11:14:08 DEBUG : upload_test_700: multi-thread copy: chunk 4/11 (201326592-268435456) size 64Mi starting
2024/10/22 11:14:08 DEBUG : upload_test_700: multi-thread copy: chunk 2/11 (67108864-134217728) size 64Mi starting
2024/10/22 11:14:08 DEBUG : upload_test_700: multi-thread copy: chunk 1/11 (0-67108864) size 64Mi starting
2024/10/22 11:14:08 DEBUG : upload_test_700: multi-thread copy: chunk 3/11 (134217728-201326592) size 64Mi starting
2024/10/22 11:14:08 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 3
2024/10/22 11:14:08 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 1
2024/10/22 11:14:08 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 2
2024/10/22 11:14:08 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 0
2024/10/22 11:14:12 DEBUG : upload_test_500: multi-thread copy: chunk 7/8 (402653184-469762048) size 64Mi finished
2024/10/22 11:14:15 DEBUG : upload_test_600: multi-thread copy: chunk 7/10 (402653184-469762048) size 64Mi finished
2024/10/22 11:14:15 DEBUG : upload_test_300: multi-thread copy: chunk 5/5 (268435456-314572800) size 44Mi finished
2024/10/22 11:14:15 DEBUG : upload_test_300.48f032b5.partial: checking file size: try 0/5
2024/10/22 11:14:16 DEBUG : upload_test_300.48f032b5.partial: checking file size: try 1/5
2024/10/22 11:14:17 DEBUG : upload_test_300: Finished multi-thread copy with 5 parts of size 64Mi
2024/10/22 11:14:21 DEBUG : upload_test_300: sha1 = 7a8bf8efc28275f9957f283c4dea66cc98b0c29b OK
2024/10/22 11:14:21 DEBUG : upload_test_300.48f032b5.partial: renamed to: upload_test_300
2024/10/22 11:14:21 INFO : upload_test_300: Multi-thread Copied (new)
2024/10/22 11:14:21 DEBUG : upload_test_800: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/22 11:14:21 DEBUG : upload_test_800: multi-thread copy: write buffer set to 131072
2024/10/22 11:14:21 DEBUG : upload_test_800: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/22 11:14:21 DEBUG : upload_test_800: Starting multi-thread copy with 13 chunks of size 64Mi with 4 parallel streams
2024/10/22 11:14:21 DEBUG : upload_test_800: multi-thread copy: chunk 4/13 (201326592-268435456) size 64Mi starting
2024/10/22 11:14:21 DEBUG : upload_test_800: multi-thread copy: chunk 2/13 (67108864-134217728) size 64Mi starting
2024/10/22 11:14:21 DEBUG : upload_test_800: multi-thread copy: chunk 1/13 (0-67108864) size 64Mi starting
2024/10/22 11:14:21 DEBUG : upload_test_800: multi-thread copy: chunk 3/13 (134217728-201326592) size 64Mi starting
2024/10/22 11:14:21 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 2
2024/10/22 11:14:21 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 1
2024/10/22 11:14:21 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 0
2024/10/22 11:14:21 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 3
2024/10/22 11:14:44 DEBUG : upload_test_600: multi-thread copy: chunk 10/10 (603979776-629145600) size 24Mi finished
2024/10/22 11:14:44 DEBUG : upload_test_600: multi-thread copy: chunk 8/10 (469762048-536870912) size 64Mi finished
2024/10/22 11:14:57 DEBUG : upload_test_600: multi-thread copy: chunk 9/10 (536870912-603979776) size 64Mi finished
2024/10/22 11:14:57 DEBUG : upload_test_600.f8a87935.partial: checking file size: try 0/5
2024/10/22 11:14:58 DEBUG : upload_test_600.f8a87935.partial: checking file size: try 1/5
2024/10/22 11:15:00 DEBUG : upload_test_600.f8a87935.partial: checking file size: try 2/5
2024/10/22 11:15:00 DEBUG : upload_test_600: Finished multi-thread copy with 10 parts of size 64Mi
2024/10/22 11:15:01 DEBUG : upload_test_500: multi-thread copy: chunk 8/8 (469762048-524288000) size 52Mi finished
2024/10/22 11:15:01 DEBUG : upload_test_500.cd80c43a.partial: checking file size: try 0/5
2024/10/22 11:15:02 DEBUG : upload_test_500.cd80c43a.partial: checking file size: try 1/5
2024/10/22 11:15:03 DEBUG : upload_test_500.cd80c43a.partial: checking file size: try 2/5
2024/10/22 11:15:03 DEBUG : upload_test_500: Finished multi-thread copy with 8 parts of size 64Mi
2024/10/22 11:15:04 DEBUG : upload_test_700: multi-thread copy: chunk 2/11 (67108864-134217728) size 64Mi finished
2024/10/22 11:15:04 DEBUG : upload_test_700: multi-thread copy: chunk 5/11 (268435456-335544320) size 64Mi starting
2024/10/22 11:15:04 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 4
2024/10/22 11:15:04 DEBUG : upload_test_700: multi-thread copy: chunk 3/11 (134217728-201326592) size 64Mi finished
2024/10/22 11:15:04 DEBUG : upload_test_700: multi-thread copy: chunk 6/11 (335544320-402653184) size 64Mi starting
2024/10/22 11:15:04 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 5
2024/10/22 11:15:04 DEBUG : upload_test_700: multi-thread copy: chunk 1/11 (0-67108864) size 64Mi finished
2024/10/22 11:15:04 DEBUG : upload_test_700: multi-thread copy: chunk 7/11 (402653184-469762048) size 64Mi starting
2024/10/22 11:15:04 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 6
2024/10/22 11:15:09 DEBUG : upload_test_600: sha1 = a7bc5ad8146f9bf4d14f7c80a5cff5a1659fe007 OK
2024/10/22 11:15:09 DEBUG : upload_test_600.f8a87935.partial: renamed to: upload_test_600
2024/10/22 11:15:09 INFO : upload_test_600: Multi-thread Copied (new)
2024/10/22 11:15:09 DEBUG : upload_test_900: multi-thread copy: disabling buffering because destination uses OpenWriterAt
2024/10/22 11:15:09 DEBUG : upload_test_900: multi-thread copy: write buffer set to 131072
2024/10/22 11:15:09 DEBUG : upload_test_900: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2024/10/22 11:15:09 DEBUG : upload_test_900: Starting multi-thread copy with 15 chunks of size 64Mi with 4 parallel streams
2024/10/22 11:15:09 DEBUG : upload_test_900: multi-thread copy: chunk 4/15 (201326592-268435456) size 64Mi starting
2024/10/22 11:15:09 DEBUG : upload_test_900: multi-thread copy: chunk 2/15 (67108864-134217728) size 64Mi starting
2024/10/22 11:15:09 DEBUG : upload_test_900: multi-thread copy: chunk 1/15 (0-67108864) size 64Mi starting
2024/10/22 11:15:09 DEBUG : upload_test_900: multi-thread copy: chunk 3/15 (134217728-201326592) size 64Mi starting
2024/10/22 11:15:10 DEBUG : upload_test_900.1ba77370.partial: writing chunk 1
2024/10/22 11:15:10 DEBUG : upload_test_900.1ba77370.partial: writing chunk 0
2024/10/22 11:15:11 DEBUG : upload_test_900.1ba77370.partial: writing chunk 3
2024/10/22 11:15:11 DEBUG : upload_test_900.1ba77370.partial: writing chunk 2
2024/10/22 11:15:13 DEBUG : upload_test_500: sha1 = d04df27549d239ad29312c844b44b65e141dc748 OK
2024/10/22 11:15:14 DEBUG : upload_test_500.cd80c43a.partial: renamed to: upload_test_500
2024/10/22 11:15:14 INFO : upload_test_500: Multi-thread Copied (new)
2024/10/22 11:15:17 DEBUG : upload_test_800: multi-thread copy: chunk 1/13 (0-67108864) size 64Mi finished
2024/10/22 11:15:17 DEBUG : upload_test_800: multi-thread copy: chunk 5/13 (268435456-335544320) size 64Mi starting
2024/10/22 11:15:17 DEBUG : upload_test_800: multi-thread copy: chunk 3/13 (134217728-201326592) size 64Mi finished
2024/10/22 11:15:17 DEBUG : upload_test_800: multi-thread copy: chunk 6/13 (335544320-402653184) size 64Mi starting
2024/10/22 11:15:17 DEBUG : upload_test_800: multi-thread copy: chunk 2/13 (67108864-134217728) size 64Mi finished
2024/10/22 11:15:17 DEBUG : upload_test_800: multi-thread copy: chunk 7/13 (402653184-469762048) size 64Mi starting
2024/10/22 11:15:17 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 4
2024/10/22 11:15:17 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 5
2024/10/22 11:15:17 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 6
2024/10/22 11:15:35 DEBUG : upload_test_700: multi-thread copy: chunk 4/11 (201326592-268435456) size 64Mi finished
2024/10/22 11:15:35 DEBUG : upload_test_700: multi-thread copy: chunk 8/11 (469762048-536870912) size 64Mi starting
2024/10/22 11:15:35 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 7
2024/10/22 11:15:50 DEBUG : upload_test_800: multi-thread copy: chunk 4/13 (201326592-268435456) size 64Mi finished
2024/10/22 11:15:50 DEBUG : upload_test_800: multi-thread copy: chunk 8/13 (469762048-536870912) size 64Mi starting
2024/10/22 11:15:50 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 7
2024/10/22 11:16:08 DEBUG : upload_test_700: multi-thread copy: chunk 5/11 (268435456-335544320) size 64Mi finished
2024/10/22 11:16:08 DEBUG : upload_test_700: multi-thread copy: chunk 9/11 (536870912-603979776) size 64Mi starting
2024/10/22 11:16:08 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 8
2024/10/22 11:16:08 DEBUG : upload_test_700: multi-thread copy: chunk 6/11 (335544320-402653184) size 64Mi finished
2024/10/22 11:16:08 DEBUG : upload_test_700: multi-thread copy: chunk 10/11 (603979776-671088640) size 64Mi starting
2024/10/22 11:16:08 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 9
2024/10/22 11:16:15 DEBUG : upload_test_900: multi-thread copy: chunk 1/15 (0-67108864) size 64Mi finished
2024/10/22 11:16:15 DEBUG : upload_test_900: multi-thread copy: chunk 5/15 (268435456-335544320) size 64Mi starting
2024/10/22 11:16:15 DEBUG : upload_test_900.1ba77370.partial: writing chunk 4
2024/10/22 11:16:15 DEBUG : upload_test_900: multi-thread copy: chunk 2/15 (67108864-134217728) size 64Mi finished
2024/10/22 11:16:15 DEBUG : upload_test_900: multi-thread copy: chunk 6/15 (335544320-402653184) size 64Mi starting
2024/10/22 11:16:15 DEBUG : upload_test_900.1ba77370.partial: writing chunk 5
2024/10/22 11:16:16 DEBUG : upload_test_900: multi-thread copy: chunk 3/15 (134217728-201326592) size 64Mi finished
2024/10/22 11:16:16 DEBUG : upload_test_900: multi-thread copy: chunk 7/15 (402653184-469762048) size 64Mi starting
2024/10/22 11:16:16 DEBUG : upload_test_900.1ba77370.partial: writing chunk 6
2024/10/22 11:16:23 DEBUG : upload_test_800: multi-thread copy: chunk 5/13 (268435456-335544320) size 64Mi finished
2024/10/22 11:16:23 DEBUG : upload_test_800: multi-thread copy: chunk 9/13 (536870912-603979776) size 64Mi starting
2024/10/22 11:16:23 DEBUG : upload_test_800: multi-thread copy: chunk 6/13 (335544320-402653184) size 64Mi finished
2024/10/22 11:16:23 DEBUG : upload_test_800: multi-thread copy: chunk 10/13 (603979776-671088640) size 64Mi starting
2024/10/22 11:16:23 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 8
2024/10/22 11:16:23 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 9
2024/10/22 11:16:24 DEBUG : upload_test_700: multi-thread copy: chunk 7/11 (402653184-469762048) size 64Mi finished
2024/10/22 11:16:24 DEBUG : upload_test_700: multi-thread copy: chunk 11/11 (671088640-734003200) size 60Mi starting
2024/10/22 11:16:24 DEBUG : upload_test_700.7874dfbd.partial: writing chunk 10
2024/10/22 11:16:40 DEBUG : upload_test_800: multi-thread copy: chunk 7/13 (402653184-469762048) size 64Mi finished
2024/10/22 11:16:40 DEBUG : upload_test_800: multi-thread copy: chunk 11/13 (671088640-738197504) size 64Mi starting
2024/10/22 11:16:40 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 10
2024/10/22 11:16:47 DEBUG : upload_test_900: multi-thread copy: chunk 4/15 (201326592-268435456) size 64Mi finished
2024/10/22 11:16:47 DEBUG : upload_test_900: multi-thread copy: chunk 8/15 (469762048-536870912) size 64Mi starting
2024/10/22 11:16:47 DEBUG : upload_test_900.1ba77370.partial: writing chunk 7
2024/10/22 11:16:57 DEBUG : upload_test_700: multi-thread copy: chunk 8/11 (469762048-536870912) size 64Mi finished
2024/10/22 11:17:11 DEBUG : upload_test_800: multi-thread copy: chunk 8/13 (469762048-536870912) size 64Mi finished
2024/10/22 11:17:11 DEBUG : upload_test_800: multi-thread copy: chunk 12/13 (738197504-805306368) size 64Mi starting
2024/10/22 11:17:11 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 11
2024/10/22 11:17:13 DEBUG : upload_test_700: multi-thread copy: chunk 9/11 (536870912-603979776) size 64Mi finished
2024/10/22 11:17:17 DEBUG : upload_test_900: multi-thread copy: chunk 5/15 (268435456-335544320) size 64Mi finished
2024/10/22 11:17:17 DEBUG : upload_test_900: multi-thread copy: chunk 9/15 (536870912-603979776) size 64Mi starting
2024/10/22 11:17:17 DEBUG : upload_test_900.1ba77370.partial: writing chunk 8
2024/10/22 11:17:17 DEBUG : upload_test_900: multi-thread copy: chunk 6/15 (335544320-402653184) size 64Mi finished
2024/10/22 11:17:17 DEBUG : upload_test_900: multi-thread copy: chunk 10/15 (603979776-671088640) size 64Mi starting
2024/10/22 11:17:17 DEBUG : upload_test_900.1ba77370.partial: writing chunk 9
2024/10/22 11:17:19 DEBUG : upload_test_700: multi-thread copy: chunk 10/11 (603979776-671088640) size 64Mi finished
2024/10/22 11:17:24 DEBUG : upload_test_800: multi-thread copy: chunk 9/13 (536870912-603979776) size 64Mi finished
2024/10/22 11:17:24 DEBUG : upload_test_800: multi-thread copy: chunk 13/13 (805306368-838860800) size 32Mi starting
2024/10/22 11:17:24 DEBUG : upload_test_800.bbbcaab0.partial: writing chunk 12
2024/10/22 11:17:30 DEBUG : upload_test_900: multi-thread copy: chunk 7/15 (402653184-469762048) size 64Mi finished
2024/10/22 11:17:30 DEBUG : upload_test_900: multi-thread copy: chunk 11/15 (671088640-738197504) size 64Mi starting
2024/10/22 11:17:30 DEBUG : upload_test_900.1ba77370.partial: writing chunk 10
2024/10/22 11:17:30 DEBUG : upload_test_800: multi-thread copy: chunk 10/13 (603979776-671088640) size 64Mi finished
2024/10/22 11:17:46 DEBUG : upload_test_800: multi-thread copy: chunk 11/13 (671088640-738197504) size 64Mi finished
2024/10/22 11:17:51 DEBUG : upload_test_900: multi-thread copy: chunk 8/15 (469762048-536870912) size 64Mi finished
2024/10/22 11:17:51 DEBUG : upload_test_900: multi-thread copy: chunk 12/15 (738197504-805306368) size 64Mi starting
2024/10/22 11:17:52 DEBUG : upload_test_900.1ba77370.partial: writing chunk 11
2024/10/22 11:17:59 DEBUG : upload_test_800: multi-thread copy: chunk 12/13 (738197504-805306368) size 64Mi finished
2024/10/22 11:18:01 DEBUG : upload_test_700: multi-thread copy: chunk 11/11 (671088640-734003200) size 60Mi finished
2024/10/22 11:18:01 DEBUG : upload_test_700.7874dfbd.partial: checking file size: try 0/5
2024/10/22 11:18:02 DEBUG : upload_test_700.7874dfbd.partial: checking file size: try 1/5
2024/10/22 11:18:02 DEBUG : upload_test_800: multi-thread copy: chunk 13/13 (805306368-838860800) size 32Mi finished
2024/10/22 11:18:02 DEBUG : upload_test_800.bbbcaab0.partial: checking file size: try 0/5
2024/10/22 11:18:03 DEBUG : upload_test_700.7874dfbd.partial: checking file size: try 2/5
2024/10/22 11:18:03 DEBUG : upload_test_900: multi-thread copy: chunk 9/15 (536870912-603979776) size 64Mi finished
2024/10/22 11:18:03 DEBUG : upload_test_900: multi-thread copy: chunk 13/15 (805306368-872415232) size 64Mi starting
2024/10/22 11:18:03 DEBUG : upload_test_900.1ba77370.partial: writing chunk 12
2024/10/22 11:18:03 DEBUG : upload_test_800.bbbcaab0.partial: checking file size: try 1/5
2024/10/22 11:18:04 DEBUG : upload_test_700.7874dfbd.partial: checking file size: try 3/5
2024/10/22 11:18:05 DEBUG : upload_test_800.bbbcaab0.partial: checking file size: try 2/5
2024/10/22 11:18:05 DEBUG : upload_test_700.7874dfbd.partial: checking file size: try 4/5
2024/10/22 11:18:06 DEBUG : upload_test_800.bbbcaab0.partial: checking file size: try 3/5
2024/10/22 11:18:06 DEBUG : upload_test_700: multi-thread copy: cancelling transfer on exit
2024/10/22 11:18:06 ERROR : upload_test_700: Failed to copy: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 734003200
2024/10/22 11:18:07 DEBUG : upload_test_800.bbbcaab0.partial: checking file size: try 4/5
2024/10/22 11:18:07 DEBUG : upload_test_900: multi-thread copy: chunk 10/15 (603979776-671088640) size 64Mi finished
2024/10/22 11:18:07 DEBUG : upload_test_900: multi-thread copy: chunk 14/15 (872415232-939524096) size 64Mi starting
2024/10/22 11:18:07 DEBUG : upload_test_900.1ba77370.partial: writing chunk 13
2024/10/22 11:18:08 DEBUG : upload_test_800: multi-thread copy: cancelling transfer on exit
2024/10/22 11:18:08 ERROR : upload_test_800: Failed to copy: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 838860800
2024/10/22 11:18:17 DEBUG : upload_test_900: multi-thread copy: chunk 11/15 (671088640-738197504) size 64Mi finished
2024/10/22 11:18:17 DEBUG : upload_test_900: multi-thread copy: chunk 15/15 (939524096-943718400) size 4Mi starting
2024/10/22 11:18:17 DEBUG : upload_test_900.1ba77370.partial: writing chunk 14
2024/10/22 11:18:21 DEBUG : upload_test_900: multi-thread copy: chunk 15/15 (939524096-943718400) size 4Mi finished
2024/10/22 11:18:26 DEBUG : upload_test_900: multi-thread copy: chunk 12/15 (738197504-805306368) size 64Mi finished
2024/10/22 11:18:28 DEBUG : upload_test_900: multi-thread copy: chunk 13/15 (805306368-872415232) size 64Mi finished
2024/10/22 11:18:30 DEBUG : upload_test_900: multi-thread copy: chunk 14/15 (872415232-939524096) size 64Mi finished
2024/10/22 11:18:30 DEBUG : upload_test_900.1ba77370.partial: checking file size: try 0/5
2024/10/22 11:18:31 DEBUG : upload_test_900.1ba77370.partial: checking file size: try 1/5
2024/10/22 11:18:32 DEBUG : upload_test_900.1ba77370.partial: checking file size: try 2/5
2024/10/22 11:18:33 DEBUG : upload_test_900.1ba77370.partial: checking file size: try 3/5
2024/10/22 11:18:34 DEBUG : upload_test_900.1ba77370.partial: checking file size: try 4/5
2024/10/22 11:18:34 DEBUG : upload_test_900: Finished multi-thread copy with 15 parts of size 64Mi
2024/10/22 11:18:43 DEBUG : upload_test_900: sha1 = 9c69d151f03f57401f7db4c6d3a9dea587d92ec4 OK
2024/10/22 11:18:43 DEBUG : upload_test_900.1ba77370.partial: renamed to: upload_test_900
2024/10/22 11:18:43 INFO : upload_test_900: Multi-thread Copied (new)
2024/10/22 11:18:43 ERROR : pcloud root 'Medien/test': not deleting files as there were IO errors
2024/10/22 11:18:43 ERROR : pcloud root 'Medien/test': not deleting directories as there were IO errors
2024/10/22 11:18:43 ERROR : Attempt 1/1 failed with 2 errors and: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 838860800
Transferred: 4.102 GiB / 4.102 GiB, 100%, 3.852 MiB/s, ETA 0s
Errors: 2 (retrying may help)
Transferred: 5 / 5, 100%
Elapsed time: 7m16.6s
2024/10/22 11:18:43 INFO :
Transferred: 4.102 GiB / 4.102 GiB, 100%, 3.852 MiB/s, ETA 0s
Errors: 2 (retrying may help)
Transferred: 5 / 5, 100%
Elapsed time: 7m16.6s

2024/10/22 11:18:43 DEBUG : 7 go routines active
2024/10/22 11:18:43 NOTICE: Failed to sync with 2 errors: last error was: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 838860800
...

Setting --low-level-retries to 10 seems to cure the problem.
Repeated again 3x the transfer with my test files using this option. All 3 transfers finished with success for all the 7 files from 300 to 900 Mb.

Update:

Tried this with files they always failed to transfer correctly.
THE --low-level-retries OPTION IS NOT THE SOLUTION!

Even set to 10 - rclone always tries only 5 times and is giving up then. See log. Why? Thought this will instruct rclone to retry every single pCloud command x times.

Here the relevant part of the log of copying a 1 Gb file.
Same result with a 2.5 Gb file.

2024/10/22 12:56:25 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 16/16 (1006632960-1073299456) size 63.578Mi finished
2024/10/22 12:56:26 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 13/16 (805306368-872415232) size 64Mi finished
2024/10/22 12:56:26 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 14/16 (872415232-939524096) size 64Mi finished
2024/10/22 12:56:26 DEBUG : VTS_04_1.VOB: multi-thread copy: chunk 15/16 (939524096-1006632960) size 64Mi finished
2024/10/22 12:56:26 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 0/5
2024/10/22 12:56:27 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 1/5
2024/10/22 12:56:28 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 2/5
2024/10/22 12:56:29 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 3/5
2024/10/22 12:56:30 DEBUG : VTS_04_1.VOB.fa329ff8.partial: checking file size: try 4/5
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 13/42 (805306368-872415232) size 64Mi finished
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 17/42 (1073741824-1140850688) size 64Mi starting
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4.ddba4246.partial: writing chunk 16
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 14/42 (872415232-939524096) size 64Mi finished
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 18/42 (1140850688-1207959552) size 64Mi starting
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4.ddba4246.partial: writing chunk 17
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 15/42 (939524096-1006632960) size 64Mi finished
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 19/42 (1207959552-1275068416) size 64Mi starting
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4.ddba4246.partial: writing chunk 18
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 16/42 (1006632960-1073741824) size 64Mi finished
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4: multi-thread copy: chunk 20/42 (1275068416-1342177280) size 64Mi starting
2024/10/22 12:56:31 DEBUG : THE_RIGHT_STUFF.mp4.ddba4246.partial: writing chunk 19
2024/10/22 12:56:31 DEBUG : VTS_04_1.VOB: multi-thread copy: cancelling transfer on exit
2024/10/22 12:56:31 ERROR : VTS_04_1.VOB: Failed to copy: multi-thread copy: failed to close object after copy: incorrect size after upload: got 0, want 1073299456

I wonder what the cause of this is. Timeouts by your ISP somehow? I have moved files much bigger than that to pCloud without issues.

German Telekom Fiber - usually quite reliable.

Not so much about reliability but maybe some throttling going on for large uploads?

Dont think that this is a problem of throttling.

The files are complete! after transfer. rclone justvis not able to verify the file size.
As i told - the partial files are moved to the trash by rclone.
If you remove them from the trash and remove the xyzabc.partial ending they ate fully functional. The intergratet pCloud videoplayer can open them and they play to the end.

So there must be a problem in.interacting of rclone and pCloud.

I am facing the same problem from a completely different place, looking forward to your inputs on the matter!

For what is worth, in my case the file size fetched from pcloud gets to the proper value only after some time.. So, if I was able to postpone the file.size check (or avoid it completely), it think it would be a step in the right direction.

has anybody tried that??

I agree.

Thats why i tought that the option --low-level-retries would help. But unfotunately it is ignored for getting the file size.

And i didn't find any other option that would do this.

Why,do you think.that is a problem of the recent release?

I have found a discussion somewhere else (forgotten where) whete it was stated that there is a problem with files bigger than 200 Mb.
This was an older post on a different platform.

So it seems to me this is an older issue.

i mentioned that up above...

Will try,in the evening...