Compaq ProLiant 6000 Performance of Microsoft Exchange Server 5.0 on Compaq Pr - Page 12
Response Time
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WHITE PAPER (cont.) NOTE: Response time scores for Configuration A at 2500 and 3000 user loads were omitted since they failed to meet the subsecond (
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W
HITE
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APER
(cont.)
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ECG052.0897
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Response Time
Response time is the key measurement for servers that are directly supporting users in the
Microsoft Exchange environment (for example, Mail and Public Folder servers). For servers that
are supporting users indirectly (for example, Bridgehead, DL Expansion, Free/Busy, DS
Replication), throughput is the more important indicator of performance. Servers indirectly
supporting users present an additional level of complexity for capacity planning exercises and are
outside the scope of this paper.
Figure 2. ProLiant 6000 Response Time (See Appendix for detailed information)
Processor Subsystem
In general, the processor subsystem is not an area of contention for Exchange servers directly
supporting Exchange Mail users. However, certain specialized server functions in Exchange
Server such as Public Folder, Bridgehead, DL Expansion, Free/Busy, and DS Replication do place
heavier loads on the processor subsystem. Unfortunately, constraints imposed by the current
version of Microsoft Exchange Server prevent its scalability in multi-processor systems beyond
two CPUs. Here are some important points about processor scalability and utilization with
Exchange Server.
•
As mentioned, CPU scalability is limited to two processors. Additional processors may be
added but will provide diminished returns (approximately ten percent or less). An additional
CPU is recommended when there are more than 1000 users.
•
Specialized Servers (see above) may require additional processor bandwidth.
•
Limits imposed by Microsoft Exchange Server technology prevent further processor
scalability at this time. NOTE: This issue will be addressed in the forthcoming version of
Exchange.
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.
Response Time
0
200
400
600
800
1000
1200
500
1000
1500
2000
2500
3000
3200
User Load
RT(ms)
HW Configuration A
HW Configuration B