Re: TCP/IP Performance

[Vern Hamberg <vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Mark, has anything been done with input/output buffer sizes in CHGTCPA? 
Also, be sure to set the maximum MTU to the appropriate size for the kind 
of line you have. Your network person should be able to see if packets are 
being split up and reassembled. The Ethernet used on AS/400 usually wants 
1492, and line descriptions for that usually are set at 1496. ATM and other 
connectivity types use a different value.

HTH

Vern

At 09:07 AM 4/23/2003 -0500, you wrote:
> 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