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Slow SFTP transfer

dankgus

I have a scheduled process that transfers a large file to a Solarwinds SFTP server.  I have done some tests and determined that I am getting about 80MB per second if I do a file transfer over SMB (just copy/paste using windows file explorer to the UNC path).

I am getting only about 4MB per second over SFTP using Filezilla as my client.  Same source file, same destination as the above example, that way I can rule out disk based transfer speed issues.  It makes SOME sense that I would take a performance hit over SFTP but this is a HUGE performance hit.

Any ideas?

THANKS!

--Dan

  • 0

    We are experiencing the same problem but we have seen the difference with SFTP and FTP/FTPS.

    We have a lot of customers that mention that our SFTP solution seems to go really slow, most of our customers use FileZilla to access the server.

    We use this solution:

    Deploy Serv-U MFT in a cluster - SolarWinds Worldwide, LLC. Help and Support

    We assumed that the "Loadbalancer" was causing this issue but today I decided to test this solution directly to an MFT node:

    Client - SFTP 22 -> Serv-U MFT

    What I noticed was that I have the same problem with the 1 node as I do if I access the nodes with the loadbalancer and gateway.

    I have also tested it with different clients and different encryption methods, in all these test I get the following results:

    Speeds:

    SFTP Encryption: aes256-cbr, MAC: hmac-sha2-256

    Upload: 2.6 MB/s Download: 5 MB/s

    SFTP Encryption: aes128-cbc, MAC: hmac-sha1

    Upload: 1.5 MB/s Download: 8 MB/s

    FTP/FTPS with TLS with PASV DATA ports

    Upload: 30+ MB/s Download: 45+ MB/s

    This is using the same username, from the same computer, in the same directory.

    I found this in the Solarwinds Knowledge Base:

    SFTP transfer slower than FTP - SolarWinds Worldwide, LLC. Help and Support

    But the difference SFTP is 80% slower than FTPS, we cannot offer these speeds to our customers. Hopefully someone knows a solution emoticons_happy.png

  • 0 in reply to paulus

    Thanks to the advice from Albert from Solarwinds support, he seems to have found a solution for my situation. When I disable these logs:

    Capture.PNG

    I get a large increase in SFTP speed!

    My new SFTP upload is: 8-11 MB/s

    My new SFTP download is: 60-65MB/s

    SFTP is now 60% slower than FTP/FTPS (because FTP/FTPS download can reach 120MB/s), but this is a massive improvement.

  • 0 in reply to paulus

    Hi, where is this log setting?

    thanks,

  • 0 in reply to brunmat

    Hi brunmat,

    You can find these settings here:

    pastedImage_0.png

    Does that help?

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