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Windows Thread, 100mb Slow, 1gb fast! in Technical; Well of course 1gb is faster than 100mb, but this is different... It seems that connections to our main data ...
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    100mb Slow, 1gb fast!

    Well of course 1gb is faster than 100mb, but this is different...

    It seems that connections to our main data server is very very slow for 100mb. Our network speed test program crashes and its taking 10+ minutes to copy a 20meg file. However if I plug the same workstation in to a 1gb switch the connection is fantastic, network speed test hits an average of 600mb and a 20meg file is instantly copied.

    This is what I've done:

    I've ruled out infrastructure as the problem for a few reason:
    Access to the other servers in the same rack do not present with the problem.

    I plugged an Asus mini book (its onboard network device is only 10/100) in to one of our gigabit switches and the problem presented, whereas desktops on the same switch (and same switch port) did not experience slowness to the main data server.

    I've checked all NIC settings on the server and accessed the managed switches and checked the ports are running duplex.

    -

    The data server is newly built and is running Server 2003 SP2. All workstations are XP SP2. Due to poor infrastucture there are a quite a few rooms in the school that only run at 100mb due to outdated switches so its a bit of a problem.

    Anyone ever come across something like this before?

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    Ideally NIC settings and switch settings should all be set to Auto. It sounds to me (possibly) you've forced Gigabit, so when running at 10/100 you're getting a lot of problems.

    What make of switches are you using? Ideally using the same make throughout your network can make a big difference.

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    Sorry, Monday morning head on, everything is on auto, not duplex. The managed switches are HP procurves, but that is not a consistency throughout the school. We've replaced as much as possible but there are still 10/100 switches of multiple manufacturers in some areas.

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    Well it sounds of though those dated switches may be causing the problem. Have you tried rebooting them?

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    This was all very strange, had a rare opertunity where all staff were in a meeting after school and we gave the server a reboot, which has resolved the issue. I would like to know what caused it but I guess I never will.

    Thanks for your input Michael.

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