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Thread: ZCS on CentOS w/ more than 4GB of RAM ??

  1. #1
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    Default ZCS on CentOS w/ more than 4GB of RAM ??

    Anyone out there running ZCS (FOSS or NE) on top of CentOS 5.x with more than 4GBs of RAM installed and recognized by the OS?

  2. #2
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    Yes, NE on CentOS 5.2 x86_64. No problems.

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    Mine is 32bit. Maybe that is the issue. Are you running kernel or kernel-PAE?

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    Yep. Look to the right to see my configuration.

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    Yes, I use CentOS 5.2 (and recently upgraded it to 5.3) with 16GB of RAM, which it has always recognized.
    Quanah Gibson-Mount
    Server Architect
    Zimbra, Inc
    --------------------
    Zimbra :: the leader in open source messaging and collaboration

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    Quote Originally Posted by jpbuse View Post
    Mine is 32bit. Maybe that is the issue. Are you running kernel or kernel-PAE?
    There is no PAE Kernel for x86_64. You should definitely use x86_64 if you can. PAE Kernels could extend the usable RAM on 32Bit Systems, but a single process can not use more that about 2GB of RAM...

    Regards
    Thomas

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    If you did go the 32bit route then as DeepBlue has said the maximum addressable amount of memory per process will be 2048MB. JVM would need to be tuned back using
    Code:
    su - zimbra
    zmlocalconfig mailboxd_java_heap_memory_percent
    ... and to set the parameter ...
    zmlocalconfig -e mailboxd_java_heap_memory_percent=20
    as described in Performance Tuning Guidelines for Large Deployments - Zimbra :: Wiki.

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    Quote Originally Posted by deepblue View Post
    There is no PAE Kernel for x86_64. You should definitely use x86_64 if you can. PAE Kernels could extend the usable RAM on 32Bit Systems, but a single process can not use more that about 2GB of RAM...

    Regards
    Thomas
    Yes I am running 32bit at the moment on the machine. Plan to move it over to a 64bit setup here sometime soon. Thanks everyone for your comments and suggestions. Once I get ZCS moved over to the 64 machine I'll repost.

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    i have same this,solved!
    mark!
    thks

  10. #10
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by siomon.liu View Post
    i have same this,solved!
    Posting a 'me too' comment isn't really helpful. What is your exact problem, please provide details and a description of what's going wrong.
    Last edited by phoenix; 01-05-2010 at 08:52 AM.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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