NEC Ultra-high-speed Data Transfer System (UDTS)
NOTICE

2026/07/27

The known issues and limitations for this version are as follows:


* If a transfer is resumed with the hcp command using both the --fio-extension option and the -r option,
  transfer performance degrades significantly.
  Do not use the --fio-extension option and the -r option together when resuming a transfer.


* If the hsync command is used for downloading with the --delete-delay option,
  the command fails. Use the --delete option instead of the --delete-delay option.


* When downloading with the hsync command, the download destination cannot be specified
  in the same way as with the rsync command. If you specify a non-existent directory with
  a trailing slash (/), the command fails.

  Example: hsync -a server:/data/dir1/ /home/user/not_found/
           (the not_found directory does not exist)

  You must create the destination directory in advance.


* If some files are skipped due to the --min-size or --max-size option in the hsync command,
  the command always returns a non-zero exit code, even if the transfer of other files succeeds.
  As a result, it is not possible to determine from the exit code whether the transfer
  completed successfully.
  To avoid this issue, create the list of files to be transferred in advance by using
  the -size option of the find command or a similar method,
  and specify that list with the --file-from option of the hsync command.


End