Email server's solution to emergencies

During the autumn, it was the day of the wanjia family reunion to enjoy the month. The customer service staff of the U-mail system received a request for assistance (by the way, our VIP customer service was provided in hours, if you have any concerns, as long as you send us a call in time, we will handle it as soon as possible, and everything is customer-centric, to relieve your worries ), in the past, a customer reported that "data center power outages often fail", and the customer service did not dare to neglect it. He invited the engineer to answer the question:

650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M01/49/41/wKioL1QRam2hOzScAAEJygg_-b0347.jpg "Title =" wps5193.tmp.png "alt =" wKioL1QRam2hOzScAAEJygg_-b0347.jpg "/>

Zhang Gong said: these problems are common because, after all, the development of different regions is different. For example, some cities in the Mainland have poor infrastructure and power outages are common. In addition, emails are most widely used in the foreign trade industry. For foreign trade enterprises, the network environments of different countries are quite different. There are more unpredictable factors, but they have higher requirements, in addition to high delivery rate and timeliness, whether data can be fully stored in case of a fault is one of the important factors to measure the brand excellence of the mail system. Zhang Gong believes that some excellent service providers in the industry, such as the U-mail system, have good solutions for such problems. Usually there will be backup servers. When a running server fails, automatically switch to the backup server, and the email will be transferred to the temporary storage in the past to ensure mail security. There are three solutions for you to choose based on your company's actual situation:

I. Mail System Cold backup:

Solution Description: two servers are used to configure the same network environment for the two servers through image software. The same data is kept on each of the two servers. When one of the mail servers fails, the system can switch to the other server in a timely manner.

The network topology is as follows:

650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M02/49/41/wKioL1QRaobjH9LKAADAKUZa5g8149.jpg "Title =" wps51b3.tmp.png "alt =" wkiol1qraobjh9lkaadakuza5g8149.jpg "/>

Advantages and disadvantages: using this solution saves costs, but the real-time performance is not very good. If a server fault is not found in time, you cannot quickly switch to the backup server, which may cause some emails to be lost.

Ii. Hot Backup of email server

Solution description:

Zhang Gong recommends this solution and thinks it is a standard solution to cope with faults. This solution uses two servers (the mail system runs on both servers at the same time) and a shared storage device disk array (the data of the mail server is stored in the disk array ). The two servers adopt mutual backup, master-slave, and parallel cooperation. During work, the two servers use the same virtual IP address to provide external services. The two servers are connected through a heartbeat line and automatically detect the working conditions of each other. When one of the servers fails, the other server makes a judgment based on heartbeat detection and immediately switches over to take over the service. This process is fully automated and completed in a short time, with little impact on the business. Because shared storage devices are used, mail data is always synchronized in real time.

Network Topology:

650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M01/49/40/wKiom1QRbZmxK-8nAADota4IjVY104.jpg "Title =" wps51c4.tmp.png "alt =" wKiom1QRbZmxK-8nAADota4IjVY104.jpg "/>

Advantages and disadvantages: This solution is the most standard, the most common, secure, and effective in real time. The disadvantage is that hardware and other facilities are expensive for the first time.

Iii. Receiving proxy, sending proxy service, and email gateway on the mail server

Both of the above solutions require the establishment of an email server on the company's intranet. In addition, if an exception or power failure occurs normally, you can establish a remote server and use the receiving and sending proxy service to avoid mail loss. If some large enterprises want to develop international markets or have business in the central and western regions, they can collect and distribute services in cities with good infrastructure.

Network Topology:

650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M02/49/40/wKiom1QRbb2wgrt4AAEIvP9rst8589.jpg "Title =" wps51c5.tmp.png "alt =" wkiom1qrbb2wgrt4aaeivp9rst8589.jpg "/>

Advantages and disadvantages:

The solution is flexible and the cost is moderate. The disadvantage is that you need to update and constantly invest in it every year. However, if your email system does not receive well on the Internet, this solution is a good choice.

Summary:

Zhang Gong concluded that the above three solutions have their own advantages and disadvantages. Enterprises should decide based on their own needs and industry characteristics. when setting up the mail server, you can negotiate with U-mail engineers to propose specific requirements. We can customize the secondary development solution based on your feedback.

Email server's solution to emergencies