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Network connection speed

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by whatnetever

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Hi everyone,

I have a Cisco gigabit switch that has ports set to 1000mb/full on the ports, and on individual servers set to Auto negotiate. When we first got the switch a month ago and move all servers to it, we were getting very good transfer rate (around 700 to 800mb/sec) on backup (Veritas). However, now it's down to 100mb or even less. Would you know if there are any tools that I can use to test the real connection speed (even though it says connected at 1gb)? What could be the problems? Any thoughts would be greatly appreciated.

Thanks,

Scotch

2 replies

by jmakowski

If the switch ports are hard set to 1000/Full, then you need to set the servers to 1000/Full. Not doing so will cause potential Duplex (or speed) mismatches and severly degrade performance. See this link at Cisco http://www.cisco.com/en/US/tech/tk389/tk214/technologies_tech_note09186a0080094781.shtml

If you can't set the server speed and duplex, then you have a problem (especially if the switches are always 1000/Full), because Cisco recommends that you hard set both sides, they don't typically recommend Auto-negotiation. And both sides have to be set the same or you invite problems.

Hope this helps.

James Makowski (working to recertify CCNA and finish CCNP).

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