SFTP client with multi-part (segmented) uploading. I tried 3D-FTP which I thought supports multipart transfers, but apparently it's just multi-threaded (each file gets a thread). (download/upload) if the FTP server supports it, since the COMB command is non-standard as of now. Nearly all proprietary FTP clients support this multi-part downloads. So in these low bandwidth situations, the FTP server administrator can and should easily prevent multi-part download by not support resume or limiting maximum simultaneous connections. The aggregate bandwidth used by a multipart transfer is identical to a single stream transfer. By default, multipart download is enabled in CrossFTP Pro. To enable/disable the multipart download in CrossFTP Pro, or change the part size, you need to go to Tools - Global Options - Transfer - Enable Multipart Download, and you can also set up the part size here.

Is there any SFTP client software that supports segmented uploading to an SFTP server?

  • Runs in Windows
  • Multi-part segmented uploading (NOT to be confused with multi-threaded)
  • Segmented uploading enabled by default or at least easily configurable
  • Restore local source timestamp on destination uploaded file (optional)
  • May support other protocols like FTP, SCP, etc. (optional)

I tried 3D-FTP which I thought supports multipart transfers, but apparently it's just multi-threaded (each file gets a thread).

What I want is multipart (combined with multi-threading), in that a large uploaded file is split locally into many parts (one per thread) and uploaded over parallel connections. Once all parts are uploaded, the parts are stitched back into a single file in the SFTP server.

Is there any such software?

As per FjodrSo's answer, BitKinex looked promising. However (quoting my comment):

When I upload, the option for multipart is disabled. It's only available and enabled when I download. According to the log it is indeed an SSH-2 server. So what's missing, what else does the server need to support? The software should be able to do the steps you described in the answer. Why isn't it doing that, and how can I force it to try?

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2 Answers

I think there is a problem with the question. The question refers to 'FTP Server' and states 'support SFTP', but FTP and SFTP are two different protocols. Also, from one of the comments we can see that you clearly talk about being able to connect to 'server terminal and use the shell like bash', so it's probably safe to infer that the server you're talking about is a SSH/SFTP server, and therefore the words 'FTP server' in the question are misleading.

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Ftp supports multipart download for windows 7

Now, keeping in mind all of the above, you cannot resolve the issue using the COMB command, as it is an extension of the FTP protocol and it doesn't even exist in any of the 7 versions (specifications) of the SFTP subsystem of the SSH protocol.

But the good news is that, regardless of the above, there is at least one multiprotocol client that does what you need: BitKinex.

Ftp Supports Multipart Download For Mac

In short, here's what it does:

  • connects to the SSH-2 server and logs in
  • opens the SFTP subsystem
  • performs concurrent uploads of 'chunks' of your large files
  • closes the SFTP subsystem
  • opens a Shell
  • recombines the various uploaded parts into the original large files
  • closes the Shell
  • disconnects from the remote SSH-2 server

And you can script out your own custom actions, if needed. I think it would be worth giving it a try in your case.

FjodrSoFjodrSo

You can use CuteFTP Pro:

  • non-free
  • Windows / Mac OS X
  • SFTP
  • can perform multi-part transfers (download/upload) if the FTP server supports it, since the COMB command is non-standard as of now:

You can greatly speed up the transfer of large files using multi-part transfers. A multi-part transfer divides large files and sends the parts over multiple FTP sessions.

You can only use multi-part uploads with servers that support the COMB command, such as GlobalSCAPE Secure FTP Server and EFT Server.

Ftp Supports Multipart Download Free

Franck DernoncourtFranck Dernoncourt
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