Research And Design Of Data Backup System Based On SAN

The storage area network (SAN) is a high-speed network technology similar with LAN. It can provide high-speed connection between storage units and clients. Unlike LAN, SAN optimizes the storage and backup. SAN uses some special communication protocols, such as SCSI and FC, instead of the normal protocols that LAN uses.With the development and consummation of the network infrastructures, SAN technology is being used more and more widely because of its advantages. And with the rapid increasing of data information, modern network storage systems are now bidding for more and more demands on data backup in scalability, efficiency, security and availability. The existing backup systems mainly include distributed backup system and backup system based on LAN. But these systems can't be quite suitable for the requirement of the applications, because the backup speed of these systems is slow and the servers' performance of these systems is being affected. So design a high-speed and high-performance backup system has very important realistic meaning.The thesis deeply analyses the mainly problems of the network backup system, then put forward a settled project of these problems. Through the detailed consideration and many aspects demonstration, this thesis designs a network backup system based on SAN. This system is a three-layer network backup system. It based on SAN, and uses the FC communication protocol and imports a management protocol—network data management protocol (NDMP) into the existing SAN backup model to manage and control the backup system. On one hand, with the aid of high-speed transport ability provided by FC communication protocol, it can increase the system's backup speed and reduce the system's backup window. On the other hand, NDMP can effectively manage the system's data stream and control stream, so it can greatly lighten the system's burden. In this three-layer network backup system, the complexity of software is increasing from bottom to top, and the data traffic is increasing from top to bottom, its greatly increase the system's performance. This system model not only has simple structure and easy tomaintain, but also needn't special components. In one word, it is a network backup system with better holistic performance.