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Virtualizing: Microsoft® Tier 1 Applications with VMware vSphere™ 4 by Hemant Gaidhani, Alex Fontana, Charles A. Windom Sr.

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Ensuring High Availability

When considering high availability for your virtualized applications or infrastructure, you must take into consideration the business requirements for application uptime, restoration, and continuance. Is automated failover, as in the case of an Exchange database availability group, required? Do you need to minimize downtime during patching? You should also review any existing service-level agreements that might be in place between you and your application owners. There are various means for providing high availability in the virtual environment, including the tools you are familiar with such as Microsoft Cluster Service and failover clusters and those unique to vSphere such as HA and Fault Tolerance. A truly high available ...

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