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Hello, my Tectia server is I have defined a UNC path which is a NAS drive in Virtual folder setting. I use password authentication and the connection is fine that I can access the NAS successfully. However, the file transmission rate is very slow... I have tried to bypass Tectia to transfer the files via FTP or Windows Explorer, the file transmission rate are normal for these channels. May I know what would be the problem of it?

asked Feb 24 '11 at 12:35

bigmanman's gravatar image


edited Feb 24 '11 at 20:08

Roman's gravatar image

Roman ♦♦

What sort of transfer rates are you seeing?

Can you post some examples for comparison?

Also, what is the ssh client that you are using? If it's Tectia, and you are using the graphical file transfer application you might get better results by using the command line tools. See this question for some examples.


Bear in mind that, depending on how the transfer is being done, there might be a huge overhead with each connection due to the encryption/decryption being performed. Specially if each file that is being transferred, goes through the whole key-exchange, user-authentication, encryption/decryption process. SFTP will never be able to match the performance of FTP or other protocols that lack encryption since they don't have the required overhead that comes with it.

Having said that, you might be able to improve things by switching to faster encryption algorithms or using Tectia client and the connection sharing capabilities that come with it which prevent a new connection being created for each transfer and instead reuse an existing connection if there is one already open.


answered Feb 24 '11 at 20:09

Roman's gravatar image

Roman ♦♦

edited Mar 01 '11 at 19:18

It's not a Tectia client. The latest test is that, there are 500 files, each with 1KB, but transfer time need more than 2 mins. By comparing it with FTP and normal transfer in WIndows explorer, it's really very slow. Is there any limitation for SSH Tectia server to define a UNC virtual folder which is a NAS?

(Feb 28 '11 at 16:16) bigmanman bigmanman's gravatar image

Do you get much different results in the same scenario but with the virtual folder mapped to local disk rather than to a UNC mapped NAS?

(Mar 01 '11 at 19:09) Roman ♦♦ Roman's gravatar image

If not, then you will most likely won't get much better results in that environment. What's the transfer rate you see with FTP/Explorer in the same scenario?

(Mar 01 '11 at 19:11) Roman ♦♦ Roman's gravatar image

I further checked with our users. The situation is a bit different from what I said before. The slow performance is talking about listing the files inside the folder, i.e. "ls" command. Actually, there are 5000 files inside the NAS folder. Users found that they need to use more than 2 mins, or even will timeout when executing "ls" command on that folder. However, if that folder is a local folder, i.e. not from the UNC path, the performance of running "ls" command is totally fine.

(Mar 03 '11 at 11:21) bigmanman bigmanman's gravatar image

Support call has been logged for this.

(Mar 10 '11 at 09:37) jamesw jamesw's gravatar image
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Asked: Feb 24 '11 at 12:35

Seen: 4,549 times

Last updated: Mar 29 '11 at 21:22

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