Troubleshooter--The Number of Users and Failover Time

Is there any correlation between the number of users on an Exchange cluster and the amount of time it takes to fail over from one node to the other?

There isn't a correlation. In an Exchange 2000 Server cluster, you create a virtual Exchange server that users connect to. Their Microsoft Outlook or Internet-protocol clients establish connections to the virtual server, and the cluster-management software routes those connections to the appropriate physical node. For example, you might have a virtual server named EXCHANGE pointing to physical machines named SCULLY and MULDER. Users' profiles point to EXCHANGE. If my mailbox is on MULDER, when that machine fails over, the Exchange-specific cluster resource­management DLLs fail the mailbox store over to SCULLY, and I can immediately reconnect. Failover time is a function of the time it takes to complete the physical transfer of the quorum disk and shared storage, plus the amount of time it takes to start the failed-over services on the target node, including the time that it takes to play back transaction logs, contact a Global Catalog (GC) server, and perform the other tasks required during a regular startup.

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