This would be my first guess as well - port speed mismatch and
autonegotiating to 100MB/sec. the other thing is, are you sure that the
network is the bottleneck? For instance, if the server is
IO/CPU/memory-bound, you may not pass as much traffic as you expect to see.


Jeff Lightner wrote:
> You said you've checked NIC but don't provide details.
>
> One thing that we've seen as a common problem is networking.  On HP-UX
> the 100 MB cards MUST be hard set to 100 Full as must the associated
> switch ports.  They do NOT autonegotiate properly.  (For Gigabit
> ethernet both sides have to be autonegotiate.)
>
> Also to try to eliminate backups being impacted by regular traffic (and
> vice-versa) you might want to consider having dedicated NICs for a
> backup LAN.
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto: veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Espe,
> Thomas
> Sent: Wednesday, October 10, 2007 9:33 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Problems with network speed (NBU 6.0MP4)
>
> Hello.
>
> We are experiencing problems with the network speed on one of our NBU
> media servers.
> This is an HP-UX 11.23 server running NBU 6.0MP4.
>
> We have tried tuning the server following the guidelines in the 'Backup
> Planning
> and Performance Tuning Guide' for NBU 6.0.
>
> We have also checked the network settings on the NIC and on the switch,
> to no avail.
>
> We find this strange, as we have our NBU master/media server (Linux) on
> the same switch and this server
> is getting up to 9-10 times faster data transfer as the media server
> does.
>
> Has anyone run into similar problems? Any hints on how to proceed?
>
>
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