IGRM599:Exchange 2003 - Best Practice Analyzer: HeapDecommitFreeBlockThreshold

Hi there,

We have run the Exchange Best Practices Analyzer on our Exchange 2003 Server and received the following Critical Issue (the Exchange currently has 4GB RAM installed):

HeapDecommitFreeBlockThreshold

Server *.*.* has 1 GB or more of memory, accommodates 45 mailboxes, and the 'HeapDeCommitFreeBlockThreshold' parameter has not been set to 262144. Virtual memory may become quickly fragmented and system instability may occur.

I understand that to correct the issue requires the creation of a Registry Key (DWORD) with the value 0x00040000:

HKLM\System\CurrentControlSet\Control\Session Manager\HeapDecommitFreeBlockThreshold

I wanted to ask if there is any real gain in enabling / creating this Registry Key bearing in mind that we have only 45 mailboxes and the Exchange sits at 1.88GB utilised RAM?

Many thanks in advance

David
gfsupportAsked:
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TheGeezer2010Connect With a Mentor Commented:
Please see this article - monitor your Memory performance and this will give you the answer - you need to do it if you are experiencing any of the symptoms named :-

http://technet.microsoft.com/en-us/library/aa998057%28v=exchg.65%29.aspx

You should btw- at the leastt be using the /3GB userva=3030
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