110 Introduction

The availability of a system or component is the amount of time that is works normally. For example, a system that works normally for 12 hours a day is 50% available. Critical systems often need to be highly available, with as little as a few minutes per year of down time. If your system is required to be 99.999% available, you may need to implement one or more high availability solutions to increase the availability of your system. There are three main areas where you can implement high availability: for applications, the middle tier, and the infrastructure.

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