I have been busy and just saw the message today. I'll try and test it. Is a linux samba server, local network, 1gb lan.
EDIT: Was mistaken Windows 7 Pro machine not the linux samba (although I'm using those as well)
Tested, and it didn't work.
Command: rclone copyto /storage/BIG-FILE.BAK DESTINATION:Backup/BIG-FILE.BAK -vv
2023/10/11 09:37:26 DEBUG : rclone: Version "v1.65.0-beta.7410.0731de6a5.fix-smb-writerat" starting with parameters ["rclone" "copyto" "/storage/BIG-FILE.BAK" "DESTINATION:Backup/BIG-FILE.BAK" "-vv"]
2023/10/11 09:37:26 DEBUG : Creating backend with remote "/storage/BIG-FILE.BAK"
2023/10/11 09:37:26 DEBUG : Using config file from "/root/.config/rclone/rclone.conf"
2023/10/11 09:37:26 DEBUG : fs cache: adding new entry for parent of "/storage/BIG-FILE.BAK", "/storage"
2023/10/11 09:37:26 DEBUG : Creating backend with remote "DESTINATION:Backup/"
2023/10/11 09:37:26 DEBUG : fs cache: renaming cache item "DESTINATION:Backup/" to be canonical "DESTINATION:Backup"
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: Sizes differ (src 861554176 vs dst 0)
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: write buffer set to 131072
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: Starting multi-thread copy with 13 chunks of size 64Mi with 4 parallel streams
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 4/13 (201326592-268435456) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 3
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 1/13 (0-67108864) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 0
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 2/13 (67108864-134217728) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 1
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 3/13 (134217728-201326592) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 2
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 4/13 failed: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 5/13 (268435456-335544320) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 4
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 5/13 failed: multi-thread copy: failed to write chunk: context canceled
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 2/13 failed: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 3/13 failed: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 1/13 failed: multi-thread copy: failed to write chunk: context canceled
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: cancelling transfer on exit
2023/10/11 09:37:26 ERROR : BIG-FILE.BAK: Failed to copy: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 ERROR : Attempt 1/3 failed with 1 errors and: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: Need to transfer - File not found at Destination
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: write buffer set to 131072
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: using backend concurrency of 4 instead of --multi-thread-streams 4
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: Starting multi-thread copy with 13 chunks of size 64Mi with 4 parallel streams
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 4/13 (201326592-268435456) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 3
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 2/13 (67108864-134217728) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 1/13 (0-67108864) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 3/13 (134217728-201326592) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 0
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 2
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 1
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 4/13 failed: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 5/13 (268435456-335544320) size 64Mi starting
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: writing chunk 4
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 5/13 failed: multi-thread copy: failed to write chunk: context canceled
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 3/13 failed: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 2/13 failed: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: chunk 1/13 failed: multi-thread copy: failed to write chunk: context canceled
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: cancelling transfer on exit
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: multi-thread copy: abort failed: remove BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 ERROR : BIG-FILE.BAK: Failed to copy: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 ERROR : Attempt 2/3 failed with 1 errors and: multi-thread copy: failed to write chunk: write BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 DEBUG : BIG-FILE.BAK: Sizes differ (src 861554176 vs dst 33554432)
2023/10/11 09:37:26 ERROR : BIG-FILE.BAK: Failed to copy: multi-thread copy: failed to open chunk writer: failed to open: open BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 ERROR : Attempt 3/3 failed with 1 errors and: multi-thread copy: failed to open chunk writer: failed to open: open BIG-FILE.BAK: invalid response error: unverified packet returned
2023/10/11 09:37:26 INFO :
Transferred: 1 MiB / 1 MiB, 100%, 0 B/s, ETA -
Errors: 1 (retrying may help)
Elapsed time: 0.6s
2023/10/11 09:37:26 DEBUG : 8 go routines active
2023/10/11 09:37:26 DEBUG : smb://spectron@vm-sql2008:445/Backup/: Closing 1 unused connections
2023/10/11 09:37:26 Failed to copyto: multi-thread copy: failed to open chunk writer: failed to open: open BIG-FILE.BAK: invalid response error: unverified packet returned