Re: Expected file transfer speeds over Gigabit?
From: ohaya (ohaya_at_cox.net)
Date: 10/24/04
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Date: Sat, 23 Oct 2004 20:05:34 -0400
>
> Now tell us about the infrastructure of your interconnectivity equipment
> since that might be where your bottleneck is and it is a controlled
> environment or are you in the middle of production?
>
> I'll have additional follow-up questions after your reply.
Hi Roland,
Both machines are essentially identical, with Xeon 3.0 GHz CPUs, 16 GB
memory and Intel 1000 NICs with latest drivers. Right now, PAE is not
enabled in the boot.ini file because we had some problems with
compatibility with some apps earlier, when PAE was enabled. But, thie
current testing is being done on clean installs, with virtually nothing
running except whatever software I use for this testing.
Both machines are booted from RAID5 LUNs on a SAN (EMC Clariion). FC
HBAs are Qlogic with PCI-X interfaces to the system.
I've previously tested "drive performance" on each machines using
HDTach3, and got ~130 Mbytes/sec burst speed and ~110 MBytes/sec average
speed, so I think that raw drive performance shouldn't be a major
factor.
I can connect the NICs on each machine together either via a fiber
cross-over cable or via a GigE switch (don't know the actual
manufacturer, as I think it's a re-branded switch) for testing. Based
on my network-only testing (e.g., Netperf), I saw about a 3-5 Mbits/sec
difference going through the cross-over vs. the GigE switch.
The two machines, network connections (e.g., cross-over or via GigE
switch are isolated, i.e., the entire configuration is essentially
standalone.
Jim
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