Microsoft SQL Server 2000 High Availability

Perception is reality, whether we like it or not. Because of this, it is important to make a distinction between the types of unavailability:

Each person in the availability equation sees a system or the entire solution differently. To mitigate issues caused by varied perceptions, service level agreements (SLAs) must be negotiated with all parties involved in the solution, including hosting companies, end users, contractors, administrators, and so on, to ensure that uptime and performance needs are met. Each SLA might state a different availability goal, but the overall availability is based on every component, not just one. Chapter 2, The Basics of Achieving High Availability, delves further into SLAs.

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