NLB clustering with Win 2003 hosts and Win 2008 hosts

Discussion in 'Clustering' started by Ajay, May 27, 2008.

  1. Ajay

    Ajay Guest

    Hello All
    I have a NLB set up which had 4 hosts all on Win 2003. We upgraded two of
    the hosts to Win 2008. Here is my question.
    Is it possible to use NLB with Win 2003 and Win 2008 hosts.

    Please let me know or if you could point me to good resources.

    Ajay, May 27, 2008
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  2. Yes, you can perform a rolling upgrade of an existing 2003 NLB cluster to
    2008. More info here:

    You do not want to remain in a mixed NLB cluster environment for any longer
    than is necessary to complete the rolling upgrade. In other words, finsh
    upgrading the remaining nodes to Server 2008.

    From the "Preparing to upgrade the Network Load Balancing cluster" section:

    During an upgrade, an NLB cluster will simultaneously have Windows Server
    2003 and Windows Server 2008 cluster nodes in the same cluster. This mixed
    mode setup is supported only when the upgrade installation is in progress
    and should not be used for an extended period of time in deployment. After
    the entire NLB cluster has been upgraded to Windows Server 2008, you can use
    new NLB features, such as IPv6 and support for multiple dedicated IP
    addresses. If you have both Windows Server 2003 and Windows Server 2008
    cluster nodes, you cannot use the new NLB Windows Server 2008 features.

    Hope this helps,
    Ryan Sokolowski [MVP], May 28, 2008
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  3. Ajay


    May 7, 2012
    Likes Received:
    Hi, we are in the middle of an upgrade process from Windows 2003 to Windows 2008 R2, with now an NLB config with 3 windows 2003 servers and 1 windows 2008 server.
    We had some trouble configuring it, but eventually we created a new NLB configuration from the Windows 2008 machine, and one by one moved the Windows 2003 server to the new config.

    Everything is working fine, except the Windows 2008 machine keeps doing 80-90% of the work.

    Does anybody know why the Windows 2008 machine takes all the traffic? I ended up setting all the Windows 2003 machines to load weight 100, and the Windows 2008 machine to 6, but still it takes 80% of the load.
    If I put the Windows 2008 machine's load weight to 5, it does not do anything anymore.

    Since we have few clients, but with a lot of requests, we set affinity to none, which worked fine with Windows 2003 only machines, but now, with the Windows 2008 machine added, it's going wrong.

    Obviously we are upgrading to Windows 2008, but this is not done overnight, so any help on this problem would be appreciated.
    rooyevaar, May 7, 2012
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