Can one use the /3GB switch in boot.ini if the server has more than 4GB of memory?

Discussion in 'Windows Server' started by Spin, Jan 26, 2006.

  1. Spin

    Spin Guest

    Can one use the /3GB switch in boot.ini if the server has more than 4GB of
    Spin, Jan 26, 2006
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  2. In short yes you can
    Stuart Graham, Jan 26, 2006
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  3. Spin

    AllenM Guest

    What would be the advantage to doing this if say your server has 4GB?

    AllenM, Jan 26, 2006
  4. If you have Exchange for example you telling Windows to split Kernel mode
    and User mode from a 2GB/2GB split to a 1GB/3GB split, so a user mode
    application like store.exe has 3gb of memory resources as opposed to default

    Stuart Graham, Jan 26, 2006
  5. Spin

    AllenM Guest

    Thanks Stuart. I've been reading some articles on the subject. If I amy can
    I get your opinion on whether or not it would be a good idea for me to apply
    this to my application server. I have a W2K3 server that is my internal
    application server as well as my terminal server with my clients using
    Citrix to connect and run published applications. I've been told that lately
    users have been seeing a lag in performance such as delays with keystrokes.
    Would this be a prime candidate to apply the /3GB switch?
    I aslo have an SBS 2003 Server that is my primary server hosting Exchange
    2003, SQL 2000 SP4, ISA 2004. It is also used for our developers but only a
    few of them. We are a small company with a total of about 20 users with
    about 6 of them being remote. Both servers have 4GB and the SBS server is a
    dual and the W2K3 server is a quad processor. Your opinion? thanks.
    AllenM, Jan 27, 2006
  6. Its a tricky one Allen, I think it could possibly help on both but you'd
    really need to test it out and try. As applications tend to really based on
    usermode environment it tends to help them, for example store.exe can run
    away with memory in a maxed out Exchange server. You can also justify this
    on an Application server like a Citrix box. Definitely bad places to use it
    are things like backup servers, im not sure about ntbackup but Veritas has a
    lot of stuff going on at kernel mode, and whereas you wouldnt expect it to
    max out 1GB you probably wouldnt want to risk it.

    Its a very grey area I guess and something I suggest you read into more,
    theres heaps or articles on it in Microsoft KB, search on things like
    exchange 3gb and sql 3gb, it might not be aimed at your setup but they give
    good insight on how it essentially works.
    Stuart Graham, Jan 27, 2006
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