I run the ucd-snmpd package on my backup servers and use cricket to graph the 
interface throughput.  It gives me pretty good stats on in/out traffic for the 
interface.  I only manage to push about 90mbit on a 100mbit interface, but I'm 
sure I could do more tuning to increase it.  I'm getting a gig-ethernet 
adapter soon to put into a 220, if I get stats I'll post them.

Oh, and have you thought about tuning your interface for better performance?  
Nice little article in adjusting TCP buffers, etc. in this months ;Login from 
Usenix.

- Andy

"Pearson, Kim (STP)" said:

>What is the best way to benchmark network throughput? We are using 2 Gigabit
>ethernet ports on our NetBackup Master/Media server, and we are not seeing
>the throughput we are expecting for backups. Since we stream multiple
>classes to each drive, I'm inclined to believe that it's the network, not
>the 8 DLT drives.  They sit idle a lot...shoe shining? We are using crude
>copy scripts now to try to measure throughput - anyone got something better?
>
>HW - Sun E450, 2 Sun Gb PCI cards dedicated to the backup segment...
>
>Thanks!
>
>Kim
>Kim Pearson
>UNIX Team Lead
>Guidant Corporation
>kim.pearson AT guidant DOT com
>
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