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Calculating server size

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Calculating server size - 8.Jul.2008 10:04:07 AM   
JCJW

 

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I have questions re: calculating server size for an Exchange 2003 server, and specifically using the formula

megacycles/mailbox = ((average CPU usage) (speed of processors in megacycles) (number of processors)) (number of mailboxes)

Using perfmon I have gathered data where the % proc time is less than 2 %, but when I use this and other info to fill in the formula the value I arrive at appears that I am already over the threshold for recommended mailboxes.  The server in question has two Intel Xeon 3.6 Ghz processors and only 120 mailboxes.  I think my math is bad or I am not understanding the values in the formula.  Specifically,

(1.3 x 3600 x 2) / 120 = 78 megacycles per mailbox.  Is this correct?

Thanks.
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RE: Calculating server size - 8.Jul.2008 6:12:50 PM   
Sembee

 

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For 120 users I would ignore the processor power of the server. Anything bought in the last three years would be fine.
Exchange needs storage. That is where the most performance gain will be made. You will make little if any gain by increasing processing power.

Simon.

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(in reply to JCJW)
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