Response Time; Processor Subsystem - Compaq ProLiant 6000 Software Manual

NOTE: Response time scores for
Configuration A at 2500 and
3000 user loads were omitted
since they failed to meet the sub-
second (<1000 ms) requirement.
In addition, Configuration B
achieved a response time score of
1075 ms for 3200 users, which
was just beyond the upper limit.
ECG052.0897
W P
HITE APER
(cont.)
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Response Time

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Response time is the key measurement for servers that are directly supporting users in the
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Microsoft Exchange environment (for example, Mail and Public Folder servers). For servers that
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are supporting users indirectly (for example, Bridgehead, DL Expansion, Free/Busy, DS
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Replication), throughput is the more important indicator of performance. Servers indirectly
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supporting users present an additional level of complexity for capacity planning exercises and are
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outside the scope of this paper.
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1200
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800
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200
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0
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500 1000
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Figure 2. ProLiant 6000 Response Time (See Appendix for detailed information)
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Processor Subsystem

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In general, the processor subsystem is not an area of contention for Exchange servers directly
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supporting Exchange Mail users. However, certain specialized server functions in Exchange
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Server such as Public Folder, Bridgehead, DL Expansion, Free/Busy, and DS Replication do place
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heavier loads on the processor subsystem. Unfortunately, constraints imposed by the current
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version of Microsoft Exchange Server prevent its scalability in multi-processor systems beyond
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two CPUs. Here are some important points about processor scalability and utilization with
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Exchange Server.
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As mentioned, CPU scalability is limited to two processors. Additional processors may be
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added but will provide diminished returns (approximately ten percent or less). An additional
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CPU is recommended when there are more than 1000 users.
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Specialized Servers (see above) may require additional processor bandwidth.
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Limits imposed by Microsoft Exchange Server technology prevent further processor
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scalability at this time. NOTE: This issue will be addressed in the forthcoming version of
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Exchange.
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12
Response Time
1500 2000 2500 3000
User Load
HW Configuration A
HW Configuration B
3200