The device most often used to do this is a load balancer, which is an appliance that accepts requests from the outside world and hands them off to the next available application server.
2
它们被安装在一个类似于电脑服务器的一种像基座一样的装置上。
These are plugged into a rack-like device that resembles a computer server.
3
另外,您必须配置(或者装置)每一个应用服务器来使用数据收集基础结构。
In addition, you must configure (or instrument) each application server to use the data collection infrastructure.