I do not think network performance may be beyond the scope of this forum. The network is such a critical part of TSM performance that network tuning for TSM operations should be a greater part of the discussions here. I, for one, am very glad to share the hard won knowledge of other network tuners.
Orville L. Lantto Datatrend Technologies, Inc. (http://www.datatrend.com) IBM Premier Business Partner 121 Cheshire Lane, Suite 700 Minnetonka, MN 55305 Email: [EMAIL PROTECTED] CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. Richard Sims <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[email protected]> 03/23/2005 11:28 AM Please respond to "ADSM: Dist Stor Manager" <[email protected]> To [email protected] cc Subject Re: TCP settings for Jumbo frames Network performance issues are rather beyond the scope of this forum: you'd be better off conferring with your networking people, who can evaluate what you're attempting and run traces to see what's actually happening. When approaching network performance test like this, the big affector is network topology. In this case, I would expect that the two systems being tested were in different subnets, going across one or more routers, where the jumbo frames may have had to be disassembled into smaller pieces, which incurs overhead. Again, this is something your site network people have to look at. Richard Sims On Mar 23, 2005, at 12:04 PM, Miller, Ryan wrote: > Here's a question from one of my cohorts, since this is our first try > at this, I thought I would see if I could get any input from anyone > else doing this. > > We have been testing jumbo frames(8990) using TSM on an AIX client. > The base line test with MTU of 1500 moved 22G in 44 minutes. Changing > the MTU to 8990 and the TCP receive and send buffer sizes on both the > mainframe and AIX client to 256K, the same 22G of data takes 1 hour > and 40 minutes. > > Also the largest input packet size is 8192, not 8940. Are their any > tcp parameters to se on the client that would help with the jumbo > frame transfer time?
