topic Re: lanadmin speed settings in Operating System - HP-UX

lanadmin speed settings

Raja Balasubramanian — Thu, 09 Dec 2004 13:30:14 GMT

Hi All,

I have a question.
We are using a D class server as a Cell server and its running Data Protector 4.1 version.Upon checking the lan card settings I got the following information.

root > lanadmin -x 0
Current Speed = 100 Half-Duplex Auto-Negotiation-ON

Is 100 Half-Duplex setting okay for running backups and is it recommended.Please let me know.

Any help is appreciated.

Thanks,
Raja.B

Re: lanadmin speed settings

Pete Randall — Thu, 09 Dec 2004 13:33:17 GMT

If the other end of the connection is capable (and it probably is), you would want to run full duplex. Also, never let either end of the connection auto-negotiate. The 10/100 drivers did not handle this very well and the standard recommendation is to force both ends to 100FD.

Pete

Re: lanadmin speed settings

Geoff Wild — Thu, 09 Dec 2004 13:33:26 GMT

It would be better to be Full Duplex.

But check with your Network Admin - make sure the port is Full Duplex.

Rgds..Geoff

Re: lanadmin speed settings

RAC_1 — Thu, 09 Dec 2004 13:36:53 GMT

I would also recommand to set auto negotiation off and setting the 100FD at both ends.

Anil

Re: lanadmin speed settings

Scot Bean — Thu, 09 Dec 2004 13:37:05 GMT

Some old 100BT LAN cards can only run HD. Can you tell us the model number of the lan card or the ioscan output for it.

Re: lanadmin speed settings

HGN — Thu, 09 Dec 2004 14:13:16 GMT

Hi

The network will work better with Full duplex setting. After discussing with your network team you can change to full duplex.

Regards

HGN

Re: lanadmin speed settings

A. Clay Stephenson — Thu, 09 Dec 2004 15:32:11 GMT

You need to identify the card. If it's an EISA card then 100HD is the maximum; if it's an HSC card then you can run 100FD. 100FD is the preferred setting but I strongly suggest that you hard-set the speed/duplex settings on both the server and the corresponding switch port. There is a fundamental ambiguity in the 100MB Auto-negotiate protocol that can result in speed/duplex mismatches and it depends upon cable length (30-40m). Hard-setting these values avoids this possible problem.