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Memory Sizing Exchange 2007

vhato
vhato asked
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Last Modified: 2013-12-12
Been up and down reading articles so I give up and gonna ask!

Vmware vSphere 4.0 host with Windows Server 2003 x64 and Exchange 2007 running Mailbox, Hub and Transport roles.  

Current VM config is: 2 Virtual CPUs, 4gb Ram.  Current CPU usage for a half a day is about 30% and 55% of allocated ram.  Performance Monitor shows heavy Page File reads, server performance feels slow and Outlook users frequently advise of poor performance.

According to Microsofts "Best Practices" based on memory sizing I calculate I should allocate 10gb of ram, so I did.  Thus far all seems OK, but Vmware states of the 10gb I allocated merely 10% is being used for Guest Mem on the host.

Maybe I am prematurely writing this, but so far it appears Vmware recommendations and Microsofts conflict. I would love to not allocate so much ram, but fear heavy Page File Reads which *may* increase latency for that iSCSI storage node.

Any ideas or should I wait for a full days use and see what happens?

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Top Expert 2010

Commented:
VMware recommendations for 'resources' will mirror the applicable application, server OS, etc. specs. I have the same setup as you and have 6GB of RAM, which I believe is the recommended amt. But, I only have about 250-300 users. Amt of users plays a bit of a role in resource config as well. I would suffice to say that if you backed up your RAM a couple GB at least, you'll still be fine.

Regards,
~coolsport00

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Commented:
And I agree with you...but why allocate so much memory when Vmware shows i only need 10%?
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