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  1. #1
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    Memory Upgrade

    Memory Upgrade:

    What is the recommended memory should Exchange 5.5 have? I just added 1 GB (total) of memory to my Exchange server, after a few days I checked the memory and the store.exe is using 98% of the memory. The memory I added improved the performance of the Exchange server. Microsoft says with version 5.5, memory up to 3 GB can be used and is used. Should 3 GB be a requirement for all Exchange 5.5?

    http://support.microsoft.com/default.aspx?...kb;en-us;182505

    XADM: Is Memory Usage of Store.exe Higher in Exchange 5.5
    The information in this article applies to:
    Microsoft Exchange Server 5.5
    This article was previously published under Q182505
    SUMMARY
    When you run Microsoft Exchange Server version 5.5, memory usage of Store.exe as viewed from Task Manager Processes may be considerably higher than in previous versions of Microsoft Exchange Server.
    MORE INFORMATION
    In versions earlier than Microsoft Exchange Server 5.5, memory over 256 MB was not used. With version 5.5, memory up to 3 GB can be used and is used, as is evident in the Task Manager Processes.

    Exchange Server 5.5 uses all available RAM for the best performance possible, unless memory usage is limited by using the Exchange Performance Optimizer. Exchange Server will release memory to other applications as required to increase system performance.

    As per the Exchange Server 5.5 Readme.doc:
    Significant changes were made to the database engine allowing Microsoft
    Exchange Server to better use large memory and multiple processor
    servers. In particular, Performance Optimizer will set the maximum
    number of information store and directory database buffers to much
    higher values than before (approximately the amount of available RAM
    divided by 4K).

    Last Reviewed: 4/4/1999
    Keywords: kbinfo kbusage KB182505

  2. #2
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    Re: Memory Upgrade

    Exchange is a big time memory hog. It will eat anything you throw at it. The key is what kind of performance you are getting. I don't think there is a magic number. It all depends on the processor you have, the volume of mail you handle, & the repsonse times you wish. FWIW, I've heard the load in general on the system is worse with Exchange 2k.

    Joe
    Joe

  3. #3
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    Re: Memory Upgrade

    Not sure what how useful this may be but here it is. I have an Exchange 5.5, WinNT 4.? server with 83 mailboxes. The server has 768Mb RAM and we only occasionally experience any delays at the client side.
    Granville

  4. #4
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    Re: Memory Upgrade

    That does not seem like vary many mailboxes. I suppose the mail volume is probably more important. If you are experiencing acceptable response on the client side and the server is not being pushed very hard I'd not worry about it. Just monitor as you would anything else.

    Joe
    Joe

  5. #5
    Super Moderator jscher2000's Avatar
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    Re: Memory Upgrade

    About a year ago I put together a system at Dell using a specialized Exchange Server estimator. Not sure if that feature is still there... or that it would give you a "minimum" configuration, but it's more input if you can find it.

  6. #6
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    Re: Memory Upgrade


  7. #7
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    Re: Memory Upgrade

    1 gb should be PLENTY... check the event viewer for problems like memory leaks....
    Mike Wolfman
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    Bow before me, for I am root.
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