network card bandwidth on a poweredge 1850?
brett.dikeman at gmail.com
Tue Mar 3 16:52:23 CST 2009
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
-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
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
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