Shulou(Shulou.com)06/01 Report--

For disaster preparedness (Disaster Recovery) purposes, 2 (or more) data centers are usually built. One is that the main data center is used to undertake the business of users, and the other is that the backup data center is used to back up the data, configuration, business and so on. There are generally three backup modes between active and standby data centers: hot backup, cold backup and double active backup. In the case of hot backup, only the primary data center undertakes the user's business. At this time, the standby data center backs up the primary data center in real time. When the primary data center is dead, the standby data center can automatically take over the business of the primary data center. Users' business will not be interrupted, so they can not feel the switching of the data center. In the case of cold backup, only the primary data center is responsible for the business, but the standby data center does not make a real-time backup of the primary data center, which may be backed up periodically or not at all. If the primary data center dies, the user's business will be interrupted. Double active users feel that it is too wasteful for standby data centers to only backup, so let both master and standby data centers undertake the business of users at the same time. At this time, the master and standby data centers backup each other and backup in real time. Generally speaking, there may be more load in the primary data center, such as 60% to 70% of the business, while the standby data center only shares 40% to 30% of the business. Hardware facilities + software systems, hardware and other manufacturers, disaster preparedness software systems are more professional, there are also disaster preparedness software systems. Two places: the same city and different places. Three centers: production center, city disaster recovery center, remote disaster recovery center.

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