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How to optimize memory usage in Exchange Server 2003

Posted by viralr on August 23, 2011

What type of optimization changes could you do for Exchange 2003? or how can you tune an Exchange Server for optimum performance?

 –Optimize Exchange memory utilization:

 1) Add the switches /3GB: First of all you should add the switches /3GB and /USERVA=3030 to boot.ini. The /3GB switch modifies the way virtual address space is created so that 3 gigabytes are available for user mode applications. By default, Windows reserves 2GB for kernel and another 2GB for user mode processes. The /USERVA switch is a more precise tuning Microsoft recommends that increases the system page table entries (PTE) by 42MB

 2) HeapDeCommitFreeBlockThreshold registry value should be 0x00040000: Configure the HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\HeapDeCommitFreeBlockThreshold registry value to 0x00040000. The HeapDecommitFreeBlockThreshold registry key specifies the number of contiguous bytes above which the memory is decomitted rather than retained for reuse, thus avoiding virtual memory fragmentation.

 3) SystemPages registry value should be 0: Verify that the HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\SystemPages registry value is set to 0.

 *Remember that there is no point in having a dedicated Exchange 2003 server with more than 4GB of memory. Coz, 4 GB of RAM is the maximum amount of memory that an Exchange Server computer can efficiently use.

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