Unusually slow performance over WAN

deriderj · Joined: 16 Sep 2007 Posts: 24

Hello,

I am using ViceVersa to copy a directory from Windows XP to Windows XP over a WAN. This is a push from source to target using backup (one way replication).

I have successfully used ViceVersa to copy over the WAN to site #1 and I get close to 300KB/Sec. When I use ViceVersa to copy the same directory to site #2 I get 5KB/Sec.

There are differences in the sites that account for some slow down but nothing that would account for the extremely slow throughput on site #2. I copied the same directory using FTP and FTP averaged 50KB/Sec.

What can you suggest I try to optimize the use of ViceVersa when copying my directory to site #2? The directory is 1.7GB and consists of 17,386 files and 251 directories. I have successfully deployed ViceVersa over the last year and this is the first time I have been stumped on what to do.

I am not using CRC checking. I have turned off all real time anti-virus and anti-spyware utilities. The CPU is on 5-10% used during the file transfer (80% when using FTP so good for you). Physical memory is only 50% used. I have tried a variety of buffer sizes from smallest to largest.

I look forward to your reply.

Thank you.

TGRMN Software · Site Admin Joined: 10 Jan 2005 Posts: 8763

Hi, is this VV profile running over VPN? Could the VPN be the issue? thanks
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Guest · Posted: Wed Jul 30, 2008 12:17 pm Post subject:

>> …is this VV profile running over VPN? Could the VPN be the issue?

Yes it is and I don't know, you tell me; Does TGRMN software require special tweaking when running over VPN to achieve expected throughput?

Using FTP (through the same VPN) throughput is what I would expect. If it helps, I’m using a Cisco VPN client.

I further refined the problem and found that the cause of the decreased throughput appears to be the when transferring tiny files (i.e. 2100 files 1K or smaller in a single directory). FTP does not suffer from this dramatic slow down when transferring tiny files over the same VPN.

Thanks.

gruss · Guest

28k is the highest I've seen, other transfers from this site over FTP will usually hit close to 256.
We are not using a VPN, this is strictly over our WAN. Any ideas would be helpful

lifo · Joined: 14 Dec 2007 Posts: 5

FTP is asynchronous. It will always be faster than vice versa. Vice versa has to contend with RPC etc.. which does add overhead. Sounds normal

deriderj · Joined: 16 Sep 2007 Posts: 24