The mirror represents a reflective surface or the same image. In the server industry, this description is also applicable to server and database/applications, which can be used to obtain machine fault tolerance. It contains operating a backup server that copys all activities and affairs of the main server. In this case, each server involved in the setting is used as another machine mirror with similar specifications, which can be used to run when the host fails. This is done by using various modules, suitable for Windows. For Linux, when the data is uploaded to the main storage disk, it will also write auxiliary disk at the same time to prevent disk failure and data loss. The server mirror function is common in independent servers and other products. The following US host JTTI introduces you to the server mirror image and another solution called load balancing:

　　Server mirror is a backup method that can be used to ensure that if your main server fails, another server can be used to fulfill the role of the collapsed server. The working principle of the server mirror solution is to ensure that the two servers are kept synchronized so that the faulty transfer server always has a copy of all the data hosted on the host; this means that if the auxiliary server must bear the role of the main server, when the automatic switch occurs, you you, you Do not notice any differences because you can access the latest copy of all data. There are many different ways to realize server mirrors, and cross -platform disaster recovery solutions will be more necessary for the backup environment of other places to custody.

　　Local server mirror image

　　The server image uses two servers in the same data center as a process. They have the same specifications and run the same platform. One server is set to the main server, responsible for serving the user normally, and the other is set to the server. When it collapses, it can fulfill the role of the main server.

　　The data custody on the main server always keeps synchronized with the server, so if the server does play a role, users can continue to use the same file work. If the files that have been used by the subordinate server and the files on the server are changed, these changes will be automatically synchronized to the main server when the main server is available.

　　Some characteristics and benefits of using server mirrors include:

　　No interruption: Because the server image involves the copy of each server, it involves less stop time. If any machine collapses, it will immediately restore the data to the auxiliary server, which will hardly lead to any stop time. This is why top companies that cannot withstand one -minute shutdown time considering server mirrors.

　　Reliable solutions: Organizations can be highly convinced that their infrastructure and equipment are safe and can avoid failure and stopping. The server mirror provides the greatest degree of guarantee, that is, constantly protecting the server from human or technical errors. If any server collapses or is hacked, another server can continue to run normally.

　　Quick data recovery: The recovery method needs to select the source, goals and appropriate replication sets. Users do not need to choose files or remember the position of the data from the source. Therefore, server mirror provides fast data recovery and supports normal operation time.

　　Flexible structure: Using standard server mirror solutions, users can increase or reduce resources at any time, and add similar resources to the auxiliary server. Therefore, settings do not have to work on a fixed structure, but can be customized according to the environment.

　　Global accessibility: If the server hosting in India and performing mirrors in the UK, the target audience located in the UK has a faster speed advantage, and because the total number of downloaders is divided into two parts (India and British servers), their download speed is downloaded. It can be faster.

　　You also need a method to guide traffic to each server. This means that you need to routing the traffic to the appropriate server without the need for an end user to perform any operation (such as entering the new URL). The system needs to know which servers have been started, which servers have been closed, and only send users to the startup server.

　　This is where the load balance can provide help. The load balancing is the practice of sending network traffic according to certain rules to create efficiency. In our server downtime, the load balancing will automatically stop sending traffic to the downtown server and redirect the user to start the server.

　　There are other reasons for using load balance. You may have servers located in different regions in the world and hope that users can connect to the nearest server. You may have a lot of traffic and hope to disperse the resource load to multiple servers. Alternatively, you may give priority to some types of traffic to some servers for other reasons.