network card bandwidth on a poweredge 1850?

Jason Slagle raistlin at tacorp.net
Tue Mar 3 17:15:09 CST 2009


What app are you using to write to the tapes?

Jason

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On Tue, 3 Mar 2009, Brett Dikeman wrote:

> I'm testing a backup server (Legato) on a Poweredge 1850, running Centos 5.2.
>
> I saturated a single gigabit connection, and switched over to a pair
> of bonded ports.  Unfortunately, the throughoutput I'm seeing is
> virtually identical- 980Mbit/sec according to Munin stats (on a single
> port, the limit was 975.)  Half a percent seems statistically
> insignificant.
> -I should be feeding it plenty; I have 10 simultaneous sessions from a
> collection of machines, several of which can do 40MB/sec on their own.
> A survey of the machines shows none of them working very hard.
> -The switch is no slouch; a lightly loaded Cisco 4506.  Everything is
> on the same blade.  Traffic is not crossing any subnets/VLANs.
> -The backup library is about as fast as you can get; 2 LTO4 drives,
> each on dedicated FC, into the machine's 133mhz PCI-X slot.  Each
> drive has been proven to independently work at over 100MB/sec.
> -Seems to be plenty of free CPU time; 25% system, 25% nice (legato), 50% idle.
>
> My main suspect was the onboard NICs, but according to lspci, they're
> PCI-X devices operating at 133mhz.  That's...plenty!  1024MB/sec or
> so...
>
> I will be running more tests to eliminate each piece of the puzzle,
> but- has anyone managed to get more than 1Gbit/sec out of an 1850
> using the onboard NICs?  Or, alternatively, tried but found it
> impossible to do so?  Unfortunately, I do not have any spare NICs
> hanging around at the moment, otherwise that would be a very painless
> test.
>
> Thanks!
> Brett
>
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