Dual active data center refers to hot backup data center and cold backup center.
1. In the case of hot backup, only the main data center undertakes the user's business, and at this time, the backup data center carries out real-time backup of the main data center, and the backup data center can automatically take over the main data center's business, and the user's business will not be interrupted, so the switching of data centers cannot be felt.
2. In the case of cold backup, only the primary data center takes over the business, but the secondary data center does not perform real-time backups of the primary data center, which may be periodic backups or simply no backups, and if the primary data center hangs up, the user's business will be interrupted.
? Extended information:
Advantages of a Dual-Active Data Center:
The ability to make full use of resources, avoiding wastefulness by having one data center sit idle for years on end. avoiding the waste of a data center being idle all year round. Through resource integration, the service capacity of a "dual-active" data center is doubled. If one data center is down, the other is still running, which is not perceptible to users.
Three conditions for the construction of a dual-active data center:
The construction of a dual-active data center must first meet three conditions, the first is application dual-activity, which means that the database must be dual-activity, the second is the network must be dual-activity, the business network to ensure that it can be connected to the two data centers at the same time, and the third is that the data must be dual-activity, and the data of the two sides must be able to be used independently.
Baidu Encyclopedia: Data Centers