A disaster backup solution for bank card information exchange Network

Demand analysis

A joint-stock financial service organization, whose core business is to operate the bank card information exchange Network, the supporting disaster backup system must be aimed at the system's potential interruption risk (disaster), provide the prevention mechanism, and ensure the continuous operation ability of the system. For a serious disaster that cannot be resisted, a system recovery mechanism must be provided to reduce the resulting business losses to an acceptable level. The entire disaster backup system must ensure data security for critical business systems and their associated systems while eliminating contention for core data with minimal planned downtime/time. In addition, disaster backup devices often have a lot of free resources in a non disaster situation and should be used well.

Design ideas

Based on the comprehensive requirements of business continuity and system running efficiency, this paper plans to establish the main station, the same city mirror station and remote backup station in a big city. In order to ensure the business continuity of the bank card information exchange Network, the design idea of the disaster backup system is mainly considered from the data management and the corresponding network planning in two aspects.

According to the business situation of the application system, the key business data is divided into four categories, which are managed by the following strategies:

Class I data: LDAP data. This part of the data is small, and the software itself can guarantee the remote synchronization and consistency of the data, so it solves the problem of remote disaster tolerance in the application layer.

Class II Data: Managing Data. Because the management and maintenance of this kind of data is very important for the safe operation of the bank card information Exchange service, the traditional data replication technology and the strict change management system are used to ensure the accuracy and consistency of the data.

Class III Data: Production operations data. This kind of data is the core application data, uses in the same city main station, the same city mirror station and the long-distance remote station both retains the data copy the way to carry on the disaster tolerance.

Class IV Data: Database. The database is large in scale, considering the performance-price ratio of the system, using the copy of data Resource III in the remote station, and regenerating the database in the off-site area.

Among them, in the same city main station, the same city mirror station uses the synchronous mirror, and realizes many distances to be up to 25 kilometers of light traffic load balance; In the same city mirror station, long-distance long-distance station asynchronous replication, and achieve two ATM link traffic load balance. The overall architecture is shown in Figure 1.

Scenario implementation, product mapping for operational analysis

The Bank card information Exchange system is located in the main station, the disaster recovery system to increase the same city mirror site, and the same city master station data always consistent, remote backup site in different places asynchronous replication, data storage using Sun StorageTek 9990 storage System. Each data write of the main operating server is performed at the same time as the main station and the same city mirror station, while the data readout is only from the main station.

If you follow the usual disaster backup system design, in the same city mirror site usually need to save two copies of the data, the second copy will be sent offsite remote backup site. However, in the bank card information Exchange system, the test proved that the second copy of the data can be omitted. In this way, you can save a set of storage devices.

The data volume is very large, if the use of general ideas, in the same city mirror and remote stations to replicate between the ATM line is almost impossible. In this disaster backup recovery system, the data from the remote station is generated by the data generation server, and it is only the data difference, not the whole data, that needs to be replicated over a distance of 1200 kilometers a day. As a result, the demand for ATM lines is greatly reduced. In addition, the remote site with Virtual tape library (VTL) to achieve data backup and archiving, is also a major feature of the whole system.

Cost analysis, application effect and characteristics analysis

Although this nationwide bank card information Exchange System construction must put the system disaster caused by the social costs in the first place, but in the system design and implementation process, still can take some methods to reduce the system cost. In terms of its disaster backup system, from a cost-saving perspective, in the same city as the site than keeping a copy of the data rather than two to save storage equipment, the remote station with historical data generation server to save remote network line costs, and remote disaster preparedness site can be used for data warehousing, such as second-tier data analysis business, Have played a very good role in saving costs.

In this project, the application of Virtual tape library (VTL) combines disaster backup with data archiving better. In addition, the Veritas Volume Manager (VxVM) for this large-scale disaster backup project is also the first time.

Service capability

During the implementation of the project, Sun uses disaster Recovery Institute International methodology to carry out rigorous planning and management of the project. For the operation of a bank card information Exchange System disaster backup system, sun company and the project team have developed rigorous scripts for all the activities in the system, at any time to provide business consulting and equipment status check and monitoring, clear each staff role responsibilities. In the event of a disaster, each responsible person in accordance with the manual to achieve the designated positions, the performance of their respective responsibilities, you can successfully complete the system switch. To ensure that the hardware system is normal, Sun has established a dedicated small spare parts library for the user.