I. Introduction
Network storage devices provide information access and sharing services for network information systems, and their main characteristics are reflected in: large storage capacity, high data transmission rate, and high system availability. Traditional network storage devices connect RAID disk arrays directly to the server of the network system. This form of network storage structure is called DAS (Direct Attached STorage). In addition, SAN (Storage Area Network) and NAS (Network Attached Storage) are also two common storage architectures.
SAN (Storage Area Network) is a high-speed storage network similar to ordinary local area networks. SAN provides an easy way to connect to existing LANs, allowing enterprises to independently increase storage capacity and make network performance independent of data access. . This independent proprietary network storage method makes the SAN have the advantages of high scalability, good manageability, and strong fault tolerance.
2. Demand analysis
With the increase of enterprise business data and the increasing dependence of applications on data, the processing requirements for effective data collection, centralized management, comprehensive analysis, and disaster recovery backup are increasing. Enterprise business systems usually have the following requirements for storage systems:
1. Data centralization
The centralized data storage and management model is conducive to the linkage processing between various businesses, and is conducive to the realization of hierarchical authorization, strengthening control and supervision, and improving the level of intensive management.
2. Business integration
Comprehensive business processing is to tightly combine various businesses into a whole, make information sharing among various systems to eliminate information islands, and lay a solid foundation for data mining and decision analysis.
3. Ensure data security
As a highly centralized system of data, the integrated business processing system has the highest priority in data security. A set of strict safeguards must be established from the aspects of network, operating system, database, storage equipment, etc. to ensure 100% availability of enterprise, user and business data.
4. Ensure high reliability and high availability of the system
The data backup of the integrated business processing system is the basic means to ensure high reliability and high availability of data. Establishing the same backup system as the business system locally or remotely, or backing up the data of the integrated business processing system in real time, will greatly improve the reliability of data resources.
5. Improve efficiency and reduce costs
Since traditional data is relatively scattered, management and backup are very difficult, and it is easy to cause damage or loss, and the security is very low. Under the integrated business processing system, data is highly centralized, management and backup are very convenient, which improves work efficiency and reduces system cost.
6. Improve compatibility and scalability
Since the integrated business processing system covers many application systems, it needs to have good compatibility and scalability. Comprehensive analysis of different user data information will enhance the pertinence and accuracy of the work. As the business expands and the amount of data increases, the scalability of the storage system is particularly important. Good scalability can ensure business continuity.
7. Data backup
With the continuous improvement and continuous operation of business systems, business data and application systems urgently need effective data security protection measures. In this case, effective data backup methods must be adopted to ensure the high security of network systems and application systems, and the establishment of an automated, cross-platform network backup management system is conducive to future system development requirements.
8. Remote data disaster recovery
The occurrence of computer system disasters is multifaceted. From the perspective of computer data management, the misoperation of the operator results in the destruction of the system and the loss of the database. System factors such as fire, earthquake, flood, etc. Maintaining business continuity is an important aspect that users need to consider when storing data. Using remote data disaster recovery methods can improve the high reliability of the system and truly protect business continuity.
Disaster recovery includes data disaster recovery and application disaster recovery. Data disaster tolerance refers to the establishment of a remote data system, which is a real-time copy of local key application data. In the event of a disaster in the local data and the entire application system, the system at least keeps a copy of the critical business data available in different locations. Application disaster recovery is based on data disaster recovery, and establishes a complete set of backup application systems (which can be mutual backups) equivalent to local production systems in different places. Building such a system is relatively complicated, not only requires a copy of the available data, but also resources including network, host, application, and even IP, as well as good coordination between the resources.
3. Enterprise SAN data storage and remote disaster recovery solution
(1) Design principles
1. Advancement
The technology used in the storage system must be advanced and mature. Now that the development of computer technology is changing with each passing day, advanced technology must be adopted to protect customers' investments, and such technology and products must be recognized by the industry as mature and promising.
2. Practicality
The purpose of building a network system is to solve the sharing and exchange of enterprise data information and provide modern management. Therefore, the starting point of the design scheme is to meet the user's information requirements.
3. Economical
The design plan must consider not only the advanced and reliable technology, but also the economic burden of the user. Therefore, the design must have a high performance-price ratio.
4. High manageability and high reliability
Because the data of the entire business system adopts a centralized storage strategy, the storage system must have high manageability. In addition, the external environment of the computer network system is changeable, and the design scheme must be robust and can be easily adjusted to meet changes in the external environment.
5. High scalability and upgradeability
The design plan must be able to meet the needs of the development of enterprise network systems, with high scalability and upgrade capabilities. The storage system must be expandable and must have a high expansion capability, and the storage area network can be upgraded with the development of computer technology.
6. Openness and standardization
The technology and products used in the design plan must be the mainstream recognized by the industry, and must meet the requirements of openness.
(2) SAN data storage solution
In the design process of enterprise data storage systems, from the perspective of system compatibility, stability and reliability, and considering the protection of existing investments, a data storage solution based on SAN architecture was selected
The solution uses Fibre Channel switches, local disk arrays, backup tape libraries and remote disaster recovery disk arrays to form a SAN system. Its high scalability will enable enterprises to have high storage capacity in the future and provide support for heterogeneous operating systems and disk systems It provides seamless support for remote disaster recovery and backup, and can combine existing investments with long-term storage solutions to build a network storage environment that is scalable, easy to manage, and can flexibly adapt to unforeseen storage needs.
(3) SAN data disaster recovery solution
The disaster recovery location of the remote data disaster recovery scheme in different places is selected within a range of not less than 20km from the local, adopts the same configuration as the local disk array, and is connected to the SAN network through optical fiber in dual redundancy mode to achieve local critical application data. Real-time synchronous replication. In the event of a disaster in the local data and the entire application system, the system at least saves a copy of the available critical business mirroring data in a remote location. This data is a full real-time copy of local production data.
For the enterprise network, the established data disaster recovery system consists of the main data center and the backup data center
Among them, the main data center is designed with a high-reliability cluster solution, and the backup data center and the main data center are connected by optical fibers. The main data center system configuration host includes two or more servers and other related servers, and a high reliability environment of multiple machines is formed by installing HA software. Data is stored in the storage disk array of the main data center. At the same time, storage disk arrays of the same structure and one or more backup servers are configured in the remote backup data center. Through the special disaster recovery software, the real-time full backup of the data stored in the main data center and the data in the backup data center can be automatically realized. In the main data center, according to user requirements, tape backup servers can also be configured to install backup software and tape libraries. The backup server is directly connected to the storage array and tape library to control the tape backup of the daily data of the system. Among them, the optical transmission equipment is used as the transmission equipment between the two data centers; the two data centers use the optical transmission equipment to form an optical self-healing ring through optical fibers (used to provide high performance, full redundancy, no switching gaps, and unobstructed routing detours Plug channel), the optical self-healing ring can provide a total of up to 80G (protected) and 160G (unprotected) communication bandwidth. Provide a high-bandwidth, high-reliability network connection for the two data centers through a high-performance backbone.
The backup data center must meet the following conditions:
(1) Have network and communication settings similar to the main data center;
(2) With basic system configuration for business application operation;
(3) Have a stable and efficient telecommunications channel to connect to the main data center to ensure real-time data backup;
(4) With daily maintenance conditions;
(5) A sufficiently safe distance from the main data center.
(4) Program features
This design solution is based on a modular, scalable, and single-point failure-free SAN solution, which features disaster tolerance and business continuity. It can provide a seamless remote disaster recovery backup solution for enterprise business systems, and provide good high availability support for the enterprise business system's efficient and highly reliable dual disk array system remote disaster recovery backup solution. Specifically, the characteristics of this design are:
The investment of the solution is not high, and the performance of the network-based data storage service has been significantly improved under the premise that the original equipment is used reasonably. The business data has been effectively collected and managed, and the optimal combination of performance and price has been achieved.
(1) The SAN storage system has good scalability, strong upgradeability, and good investment protection.
(2) The storage system supports centralized data management, and related business systems or all application system storage systems are merged into a unified storage system.
(3) Adopt an open architecture to support the access of multiple system platforms, that is, to achieve cross-platform operation.
(4) Heterogeneous environment data sharing, that is, different platforms and database systems realize the sharing of related data, and at the same time support the access of storage devices of mainstream third-party manufacturers.
(5) Provide redundancy support including storage media, interface devices and connection links.
(6) When providing efficient and reliable data storage services to network clients and application servers, it will not significantly affect the operating efficiency of application systems and the speed of the network.
(7) Adopt local tape backup and remote disaster recovery measures, determine the data backup level according to its importance, configure data backup and disaster recovery strategies, and adopt advanced data disaster recovery and disaster recovery technologies to ensure the reliability of the information system and the importance of data .
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