Retrieval of data
from memory is measured in nanoseconds (10 9 ), whereas retrieving data from disk is measured in
milliseconds (10 4 ). The difference between 10 9 and 10 4 of a second would be a similar to comparing a
1 GHz of processing power to 10k kHz of processing power! The suggested memory sizing requirements
are to have a minimum of 2GB of memory plus 5MB per mailbox. The Information Store will attempt to
use as much memory as possible to cache as many operations as it can. High memory utilization can
be expected on the Exchange Server 2007 computers, which is a change from Exchange Server 2003 and
is expected behavior.
The page file should be set equal to the amount of physical memory installed on the computer plus an
additional 10MB of memory. This is partially for crash dumps, but Exchange will also page out some of
its operations to disk. If Exchange is excessively paging, however, it would require adding more physical
RAM to the server to improve performance.
Chapter 3: Using PowerShell to Deploy Exchange Server 2007
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The amount of disk storage that is required depends on the role of the server. All servers will need 1.2GB
of space for the Exchange install. Microsoft requires an additional 200MB of free space on the system
drive for related components.
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