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Exchange 2007 not using available RAM

Posted on 2013-11-24
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Last Modified: 2013-11-30
Hi,  We have a recently-virtualized Exchange 2007 server with 24GB of RAM allocated.  For some reason (defying all logic) it is using less than 4GB of RAM at any given time.  The 24GB show available in the OS (64-bit 2003R2) but Exchange and the store are not caching the information store like they should.

I found a couple places in ASDIedit.msc where there were limits you could put on the information store but they are <not specified> for mine.  Really strange.

Any help would be greatly appreciated.
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Question by:taftelectric
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Author Comment

by:taftelectric
ID: 39673485
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Assisted Solution

by:N-W
N-W earned 250 total points
ID: 39673487
Are you having performance issues with the Exchange server?

Recommended RAM for Exchange 2007 is 2GB plus 5MB of RAM per mailbox (for heavy usage). As a result, 4GB of RAM would allow for around 400 mailboxes. Are you exceeding 400 mailboxes?

Here's some additional information on memory configuration for Exchange 2007: http://technet.microsoft.com/en-us/library/bb738124.aspx
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Author Comment

by:taftelectric
ID: 39673495
Yes we are having slow performance.  We have about 250 mailboxes with a handful for super power users with no quotas.  A couple 20GB mailboxes even with archiving 6 months back.

I thought 24 GB of RAM would be excessive but wanted to see how much it would use hoping that it would improve performance.
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Author Comment

by:taftelectric
ID: 39673506
That link mentions 2GB for each role and this is a standalone Exchange server, so it should be using 8GB for those roles
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Assisted Solution

by:Seth Simmons
Seth Simmons earned 250 total points
ID: 39673516
on the processes tab, how much memory is store.exe using?
how much physical memory existed before p2v conversion?
any warnings/errors in the event logs?
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Author Comment

by:taftelectric
ID: 39673535
Store is using 477K.  The old physical server had 4GB of RAM.  Fortunately it was installed with x64 OS.  Processes tab attached.  No errors or warnings in system/app logs.Processes
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Accepted Solution

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taftelectric earned 0 total points
ID: 39675594
I was impatient, it took about 12 hours and then Store.exe started using the additional 20GB of available RAM.  If anyone needs to address limits for RAM in Exchange, ASDIedit.msc from the Server Support pack download can make those changes.

Thanks all.
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Author Closing Comment

by:taftelectric
ID: 39686672
I was able to resolve by waiting 12 hours, when the RAM usage started looking good.
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