Summary FTP Performance

From: Mike Costa <costam_at_optonline.net>
Date: Fri Oct 19 2001 - 09:28:49 EDT
This is a multi-part message in MIME format.

--Boundary_(ID_1rGhxcFBkWKYEmlLPHbo7Q)
Content-type: text/plain; charset=iso-8859-1
Content-transfer-encoding: 7BIT

Thanks to everyone that responded to my question.

There was a very common thread to all of the answers, i.e NIC to SWITCH configuration. As a network guy, this was the first thing I checked since it has caused me problems in the past. 

The problem itself turned out not to be related directly to Solaris but a problem with the Computer Associates TCP/IP product (TCPAccess) running on an IBM OS/390 2.5 operating system. Turns out this product does not like to play with UNIX very well. We tested with another IBM mainframe and were able to achieve speeds of about 900Kbps. The best I could do, even with tuning the TCP stack on Solaris, when talking to the CA product was about 33Kbps. We are now using a Windows server as an intermediate stop before sending it to the Solaris station for processing. (We're going to try to figure out the problem as a learning experience. We're going to replace the CA product with IBM's version anyway.)

However, one thing I did notice was that the default settings for TCP on Solaris are not optimum for large transfers. They work pretty well but can be better. We played with several settings and were able to get better performance. This is important since we will be doing a lot of "large" transfers in the very near future. If anyone is interested in what the settings end up being, I'll post them when we finish the testing this weekend.

Again, thanks to everyone who responded to my question. I appreciate it......


Mike



Mike Costa
costam@optonline.com

--Boundary_(ID_1rGhxcFBkWKYEmlLPHbo7Q)
Content-type: text/html; charset=iso-8859-1
Content-transfer-encoding: 7BIT

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
<META content="MSHTML 5.00.3211.1700" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Thanks to everyone that responded to my 
question.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>There was a very common thread to all of the 
answers, i.e NIC to SWITCH configuration. As a network guy, this was the first 
thing I checked since it has caused me problems in the past. </FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>The problem itself turned out not to be related 
directly to Solaris but a problem with the Computer Associates TCP/IP product 
(TCPAccess) running on an IBM OS/390 2.5 operating system. Turns out this 
product does not like to play with UNIX very well. We tested with another IBM 
mainframe and were able to achieve speeds of about 900Kbps. The best I could do, 
even with tuning the TCP stack on Solaris, when talking to the CA product was 
about 33Kbps. We are now using a Windows server as an intermediate stop before 
sending it to the Solaris station for processing. (We're going to try to figure 
out the problem as a learning experience. We're going to replace the CA product 
with IBM's version anyway.)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>However, one thing I did notice was that the 
default settings for TCP on Solaris are not optimum for large transfers. They 
work pretty well but can be better. We played with several settings and were 
able to get better performance. This is important since we will be doing a lot 
of "large" transfers in the very near future. If anyone is interested in what 
the settings end up being, I'll post them when we finish the testing this 
weekend.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Again, thanks to everyone who responded to my 
question. I appreciate it......</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Mike</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Mike Costa<BR><A 
href="mailto:costam@optonline.com">costam@optonline.com</A></FONT></DIV></BODY></HTML>

--Boundary_(ID_1rGhxcFBkWKYEmlLPHbo7Q)--
Received on Fri Oct 19 14:28:49 2001

This archive was generated by hypermail 2.1.8 : Wed Mar 23 2016 - 16:32:33 EDT