Microsoft KB Archive/326267

= XADM: White Paper - Microsoft Exchange: Scalability Testing =

Article ID: 326267

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition

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This article was previously published under Q326267



SUMMARY
Microsoft Corporation commissioned eTesting Labs to compare the scalability of Exchange 2000 running under Microsoft Windows 2000 Advanced Server to the scalability of Microsoft Exchange Server 5.5 running under Microsoft Windows NT 4.0 Enterprise Edition. Microsoft requested that eTesting Labs perform this comparison by using an appropriate test tool to simulate the real-world usage of a large population of simulated Post Office Protocol (POP) and Simple Mail Transfer Protocol (SMTP) users. eTesting Labs chose the Ziff Davis E-mail Server Test Tool (ZDESTT) for this task.

The results of this test, which tested large numbers of simulated users, showed a significant scalability and performance increase from Exchange Server 5.5 to Exchange 2000. Specifically, eTesting Labs found the following results:
 * Exchange 2000 was 66 percent more scalable than Exchange Server 5.5. Exchange 2000 delivered e-mail for 66 percent more simulated users than Exchange Server 5.5. On the four processor servers that were used, Exchange 2000 processed the message traffic for up to 83,000 simulated users, whereas Exchange Server 5.5 handled only up to 50,000 simulated users before it reached its capacity.
 * Exchange 2000 latency performance exceeded Exchange Server 5.5 by more than 20 percent. At all of the simulated user load levels that were tested, Exchange 2000 produced lower average server response times compared to Exchange Server 5.5 (by at least 20 percent).

See the &quot;Test Results&quot; section and the &quot;Test Methodology&quot; section of this white paper for complete details.



MORE INFORMATION
The following file is available for download from the Microsoft Download Center:

Microsoft Exchange: Scalability Testing

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

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Keywords: kbinfo KB326267

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