sever and mirroring(服务器和镜像）是什么

sever and mirroring(服务器和镜像）是什么

服务其是一种通过网络把信息传输给用户的计算机。（注意：这里的计算机是广义的计算机，即能处理和计算的机器。）服务器包括文件服务器，邮件服务器和网页服务器。

镜像是一个可以帮助你信息的备份的服务器，它包含文件复制、数据库复制、网页复制和服务器复制，帮助我们存储信息，交互系统和提供多样化的文件格式。

mirroring is a sever that provides a copy of data you are or want to processing, which could offer file saving, database copy, website copy or even sever copy.

pros:Help you with fault tolerance, in which case your data can be saved if your program or computer is out of work.

For file copy,it enables file providing for users using different kind of file format. When your download one page from website, the website will specify the format of data you need(URLS) and provide you the specific type of data.

For server copy, it enables "role swiching".When a principle server is updating, your duplicate sever takes over the work that used to be your severs'.

cons:you have to download or install the program, costing you some memory from your computer.