Because nic & switch vendors never seem to implement the autodetect spec in the same and/or correct way. Depending on the manufacturer of the switch/nic, sometimes you have to use auto on both, sometimes you have to hardcode both, sometimes you have to hard code one but set the other to auto. There's very little rhymm, reason, or predictability. You just have find out what usually works with your particular combination of equipment. This makes it very difficult if you don't have standardized hardware in your environment, and have to figure this out for every individual combination of equipment.
The exception to this is if you've got a gigabit nic plugging into a gigabit switch. That link virtually always has to be set to "auto" on both ends if you want to get gigabit speed. >>> [EMAIL PROTECTED] 11/30/2005 10:00 AM >>> Can anyone give the technical reason why auto detect on Server NICs cause such horrible performance for TSM server backups and restores. We have our TSM server NIC set to 100MB Full also our switch Port set to 100 Full but we have users with sorted networks such as 1 GB switches plugged into 100 M wall jacks and travel across several routers., well you get my meaning. These people or demanding to know why they take 8 days to restore 6 GB. They have their server NIC set to Auto detect, They have a 1 GB switch that the server and several others are plugged into because they want hi speed between these servers. But this switch plugs into a normal 100 meg wall jack to get to our data center. I have instructed them to put the NIC to 100 Full and possibly move off swith but they want a technical reason why. They are developers. ---------------------------------------------------------------------- This e-mail, including any attached files, may contain confidential and privileged information for the sole use of the intended recipient. Any review, use, distribution, or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive information for the intended recipient), please contact the sender by reply e-mail and delete all copies of this message. Confidentiality Notice follows: The information in this message (and the documents attached to it, if any) is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken, or omitted to be taken in reliance on it is prohibited and may be unlawful. If you have received this message in error, please delete all electronic copies of this message (and the documents attached to it, if any), destroy any hard copies you may have created and notify me immediately by replying to this email. Thank you.