SBS2011 Limiting Exchange 2010 Store Memory

Problem: Exchange 2010 Store is using too much memory making response times slow for other services. The problem may be related to your Exchange 2010 Cache Sizes. See the chart below:

Default mailbox database cache sizes:

Server physical memory (RAM)

Database cache size: (Mailbox role only)

Database cache size: Multiple-role (Mailbox + Hub Transport)

2GB

512 MB

Not supported

4GB

1 GB

Not supported

8GB

3.6 GB

2 GB

16GB

10.4 GB

8 GB

24GB

17.6 GB

14 GB

32GB

24.4 GB

20 GB

48GB

39.2 GB

32 GB

64GB

53.6 GB

44 GB

96GB

82.4 GB

68 GB

128GB

111.2 GB

92 GB

Solution: To revise the size limits you need to open ADSIedit, right click on ADSIEdit and select “Connect to…” as shown below:

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In Connection Settings > select a well know Naming context “Configuration” and “OK” as shown below:

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Now we need to drill down to the proper CN=Information Store

Configuration>Configuration>Services>Microsoft Exchange> First Organization> Administrative Groups> Exchange Administrative Group> Servers> Servername> InformationStore as shown below:

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Right click on CN=Information store and select properties, Scroll down to “msExchESEParamCacheSizeMax”, select and click Edit as shown below:

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Now input the memory limit of your choice using the calculation guide below:

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Exchange 2010 on SBS2011 uses 32KB pages so to calculate the number to input:

4GB=4194304 KB /32 = 131072
5GB=5242880 KB /32 = 163840
6GB=6297456 KB /32 = 196608
7GB=7340032 KB /32 = 229376
8GB=8388608 KB /32 = 262144

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In this instance I am going with 8GB. You can go higher by continuing the table above to come up with your Value calculation.

Then stop and restart your Exchange Store and see the immediate results.

Note: The lower the setting the more it will impact your Exchange environment so you may have to do some up and down adjustments to make it work best for your situation.

Credit:
Andy Cook
Michel de Rooij
http://eightwone.com/2010/03/25/limiting-exchange-2010-database-cache/
https://technet.microsoft.com/en-us/library/ee832793.aspx

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