TCP/IP Performance

[mgarton@xxxxxxxxxxxxxxx]

My company is running one of the High Availability products to replicate 
(via sockets) our corporate system to our DR system in a data center 400 
miles away.  We have a 9 Mbps WAN link that is dedicated to this process. 
The problem is that we are not able to fully utilize the pipe even though 
the HA product shows that there are transactions backed up waiting to be 
sent.  Currently we are only able to utilize 5 to 6 Mb of the pipe.  We 
have ran performance reports on production system (model 830, V5R2) and 
there are no errors on the line and the IOP is not over utilized.  We have 
set up a separate memory pool for the HA application.  It doesn't seem to 
make a difference if the system is busy or not.  I have tried working with 
the HA product vendor, our network people, and the communications vendor 
and nobody has found anything problems.  Does anyone have any other 
suggestions?  I was wondering if there is something that we could tweak in 
the TCP attributes on the production system to get better throughput. 
Thanks in advance.


Mark Garton
Disaster Recovery Team Leader
O'Reilly Auto Parts