data backup
1, city disaster recovery
City disaster recovery is to build two data centers in the same city or region similar (≤200KM): a data center, responsible for the daily production runs; the other is a disaster recovery center, is responsible for running the applications after a disaster. City data center disaster recovery and disaster recovery center distance of more recent, better communication line quality, relatively easy to implement synchronous data replication, to ensure high data integrity and zero data loss. City disaster recovery are generally used for fire prevention, building damage, disaster power failure, computer systems and vandalism caused.
2, Disaster Recovery
The distance between the primary site disaster recovery center distant (> 200KM), and therefore generally use asynchronous mirroring, a small amount of data loss. Off-site disaster recovery can not only prevent potential risks that may be encountered fire, building damage, etc., but also to prevent war, earthquake, flood and other risks. As the city off-site disaster backup and disaster recovery own strengths, to achieve the best effect of disaster prevention, data centers should consider the establishment of a city and off-site disaster recovery center each way around.
Local disaster recovery refers to the establishment of disaster recovery system in the local room, everyday situations can be shared simultaneously run business and management systems, and can switch the operation; event of a disaster emergency disaster recovery can be switched without substantial loss of data, to keep business continuous operation. Compared with the site disaster recovery mode, the local center having double low investment costs, building speed, operation and maintenance management is relatively simple, higher reliability, etc; off-site disaster recovery center refers to the establishment of a backup in the remote disaster recovery center, for dual data center backup, when natural disasters and other causes of malfunction occurs two-center, off-site disaster recovery center can resume operations with backup data.
Local disaster recovery room is mainly used to prevent the failure of the production server, remote disaster recovery center for large-scale regional disaster prevention. Because of its local disaster recovery room and a production center in the same room, it can be connected through a local area network, data replication and therefore is easier to achieve the application switching, enabling fast switching applications and real-time replication of data between the production server and disaster recovery. Off-site disaster recovery center due to a limit line which is connected to the network bandwidth and quality production center not in the same room, and the production side of the disaster recovery side, switching applications also takes time, and therefore off-site disaster recovery center can be implemented in the business and recover lost data in the tolerable range of the recovery within a limited time.
3, two three centers
In recent years, combined with large-scale natural disasters, domestic occurrences to double the city center plus off-site disaster recovery center, "two three centers' disaster recovery mode also will appear, disaster recovery and high availability capabilities of both this program.
Twin city center refers to the establishment of two independent bear critical systems running data centers, two centers have basically the same service processing capability and high-speed links through real-time synchronization of data in the same city or nearby cities, everyday situations can simultaneously manage and share business operation of the system, and the switching operation; case of disaster emergency disaster recovery can be switched without substantially without loss of data, to maintain continuous operation of the business. Compared with the site disaster recovery mode, bis city center a low investment cost, building speed, operation and maintenance management is relatively simple, the advantages of higher reliability.
Off-site disaster recovery center is built on the city off-site disaster recovery center a backup for double data backup center, when natural disasters and other causes of malfunction occurs two-center, off-site disaster recovery center can conduct business with backup data restore.
Two three centers: it refers to the city center a double plus remote disaster recovery solutions a commercial disaster recovery; refers to two city, remote; three centers is the production center, city disaster recovery center, remote disaster recovery center. (Production centers, disaster recovery center city, off-site disaster recovery center)
4, the data-active center
The so-called "active-active" or "live" data center, the data center is different from the conventional pattern and disaster recovery center, the former two, or a plurality of data centers which are in operation, the same applications run, with the same data, can be provided load balancing across the central business operation capability, to achieve continuous application availability and disaster recovery capabilities, so called "double live" and "live"; the latter is put into operation production data center, disaster recovery data center in an inactive state, only when a disaster occurs, the production data center to fail, disaster recovery center was started.
"Double live" data center is the biggest feature:
First, the full use of resources, avoiding a data center year-round in an idle state and wasteful, through the integration of resources and service capabilities "double live" data center is doubled;
Second, the "active-active" if the data center off a data center, which can quickly switch to another service running a data center, the switching process is not perceptible to the user. In the "active-active" mode, two data centers at the same time accept the transaction, great technical difficulty, we need to change many of the underlying process, so in reality, there are no cases of successful application truly "double live" data center.
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