Are you using a VIF?    My understanding is that the 6509 does not support aggregation and jumbo frames.    The 6509 supports aggregation OR jumbo, but not both together. 
-----Original Message-----
From: Derek Lai [mailto:Derek.Lai@onyxco.com]
Sent: Thursday, April 22, 2004 4:15 PM
To: toasters@mathworks.com
Subject: Jumbo frame

Hi
 
I just took over the administration of a F940C cluster. They and the servers are on a dedicated network running Gigabit Ethernet through a Cisco 6509 switch. I noticed that jumbo frame was not turned on. I had asked the previous administrator why and he said that they had tested the systems initially with Jumbo frame and did not notice any appreciable difference in performance.
 
The main applications we are running are 3 databases - Oracle on HP-UX, Oracle on NT and SQLServer 2000 on NT. Anyone has good performance numbers using Jumbo frame vs. not using Jumbo frame? Jumbo frame is one of the highly recommended things by NetApp and I'd like to implement it but it sure would be nice to have some idea so I can set the right expectations. Thanks.
 
 
Derek