If you use Jumbo Frames at the client, tsm server and switches. You will see a higher through put with a lot less cpu utilization. I my experience the biggest problem with backup speed is the client is the bottle neck. Either it cann't read from its disk fast enough to support gig speeds or the client cpu cann't process the data fast enough. Usually with a P660 with 4x750's processors, and multiple HBA's connected to your SAN that tsm server won't be the problem.
-----Original Message----- From: Antonio J Pires [mailto:[EMAIL PROTECTED]] Sent: Monday, December 30, 2002 5:43 AM To: [EMAIL PROTECTED] Subject: Re: Gigabit Ethernet speed Hi, Can we use 2 or more gigabit interfaces to increase backup bandwidth? Any experience on this approach? Thanks in advance, António Pires "Seay, Paul" <seay_pd@NAPTHEON To: [EMAIL PROTECTED] .COM> cc: Sent by: "ADSM: Subject: Re: Gigabit Ethernet speed Dist Stor Manager" <[EMAIL PROTECTED] .EDU> 28-12-2002 08:36 Please respond to "ADSM: Dist Stor Manager" I agree. However, to my knowledge that is either the default for the P660 offering or there is no way to set it. We use hardware on our Windows machines. Even then, you have to process the packet queues and when moving 70MB/sec of 1500 byte packets, it takes some resources. Paul D. Seay, Jr. Technical Specialist Naptheon Inc. 757-688-8180 -----Original Message----- From: Rushforth, Tim [mailto:[EMAIL PROTECTED]] Sent: Friday, December 27, 2002 8:27 PM To: [EMAIL PROTECTED] Subject: Re: Gigabit Ethernet speed Consider using NIC's with TCP Offload Engines (TOE'S)- this should help with CPU utilization. -----Original Message----- From: Seay, Paul [mailto:[EMAIL PROTECTED]] Sent: December 27, 2002 2:53 PM To: [EMAIL PROTECTED] Subject: Re: Gigabit Ethernet speed For some reason we forget that IP packet processing on the client and server take a lot of CPU resources. Check your CPU utilization on both to see what is happening. My experience is a 450mhz x 4 P660 can process maximum of about 70000 kb/sec. When we had only one gigabit interface that is what it ran at and also with 2 gigabit interfaces in total. In both cases the CPU goes to 100 percent and no more packets can be processed. It can also be a client issue if they do not have enough CPU to push the data to the server. This is the place LANFREE comes into play. Paul D. Seay, Jr. Technical Specialist Naptheon Inc. 757-688-8180 -----Original Message----- From: Conko, Steven [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 24, 2002 9:44 AM To: [EMAIL PROTECTED] Subject: Gigabit Ethernet speed anybody have any tips on what type of "Network transfer rate" we should be seeing for our backups over gigabit ethernet? the clients backup via copper Gb ethernet dedicated for backups to a tsm server connected to a 3494 tape library with 10 3590 tape drives via fibre channel/brocade switch. there is only one client on one gigabit interface and 3 on another. any tips for improving network performance? thanks Steven A. Conko Senior Unix Systems Administrator ADT Security Services, Inc. ***************************EMAIL DISCLAIMER*************************** This email and any files transmitted with it may be confidential and are intended solely for the use of th individual or entity to whom they are addressed. If you are not the intended recipient or the individual responsible for delivering the e-mail to the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is strictly prohibited. If you have received this e-mail in error, please delete it and notify the sender or contact Health Information Management 312.996.3941.
