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Considerations when deploying Exchange on an Active/Active cluster
Article ID: 815180 - View products that this article applies to.
This article discusses some of the things to consider when you deploy Microsoft Exchange 2000 Server or Microsoft Exchange Server 2003 in an Active/Active clustered environment.
Microsoft does not recommend the deployment of Exchange 2000 servers or Exchange 2003 servers in an Active/Active clustered environment. Additionally, Exchange 2000 and Exchange 2003 are supported as Active/Active in two-node clusters only. Clusters that have more than two nodes must be Active/Passive. For more information about this subject, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/329208/ )Exchange virtual server limitations on Exchange 2000 clusters and Exchange 2003 clusters that have more than two nodes
In an Active/Active cluster, when one node fails or is taken offline, the other node in the cluster takes over for the failed node. However, because the failover causes the remaining node to take on additional processing operations, the overall performance of your Exchange 2000 cluster or Exchange 2003 cluster may be reduced. For performance, availability, and scalability reasons, Active/Passive cluster configurations are a better option than Active/Active configurations.
In a typical Active/Active cluster configuration, each node owns one Exchange virtual server. However, if the number of Exchange virtual servers in the cluster is greater than or equal to the number of nodes in the cluster, and even when all the Exchange virtual servers are owned by only one node in the cluster, the cluster is still considered an Active/Active cluster. To migrate from an Active/Active cluster configuration to an Active/Passive configuration, you must remove the second Exchange virtual server. For information about how to remove an Exchange virtual server, see the "Removing an Exchange virtual server from a Cluster" section in the Deploying Microsoft Exchange 2000 Server Clusters Exchange Online Book. To view this Exchange Online Book, visit the following Microsoft Web site:
Sizing Active/Active clustersWhen you plan your Exchange 2000 topology using Active/Active clusters, you must consider the following important constraints:
http://go.microsoft.com/fwlink/?LinkId=9393For additional information about deploying Exchange 2003, see the Exchange 2003 Deployment Guide. To view the Exchange 2003 Deployment Guide, visit the following Microsoft Web site:
http://technet.microsoft.com/en-us/library/bb123872.aspxFor more information about how to implement Exchange 2000 Server on a Windows 2000 cluster, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/328875/ )How to implement Exchange 2000 Server on a Windows 2000-based cluster
(http://support.microsoft.com/kb/810986/ )Microsoft support policy for Exchange Server installed on cluster nodes