San-based Data Backup System

With the development of information, and data are the key to the information, it leads to protections for data. Storage Area Net(SAN) is facility to manage, has good expansibility, strong fault-tolerance ability, has high dependability, is agility to config, and supports isomerism servers. For these advantages, SAN resolves many problems at data usability, security, and storage performance, in the age of data burst.Backup is the most popular method of data protection. Data backup is the last line of defence for high availability. NO matter what disaster recovery project used, data backup is the basic. Recovery project is useless without backup. Data backup is the basic for establishing disaster recovery system, and is the basic for restore. With the increase of data capacity, users have new requirement at security, flexibility, compatibility and expansibility.So this essay concentrates on data backup and does some analyses and discussions.As a rapidly developing technology, storage and backup will have wide development. The author joined the design and development of SANbased software, and did some research about SAN technology.This essay discusses the design of backup system in SAN. And this system has the following specialties.1 Realizing backup function in disk array level and support many kinds of file-systems and operation-systems. It makes the system more agility and it is easy to use excellence operation-systems and third party soft ware.Support many kinds of file-systems and operation-systems. It is easy to use excellence operation-systems and third party soft ware.2 Supporting multi backup designs. Not only supporting mirror image and snapshot, but also the combination and chain of mirror image and snapshot. Giving high flexibility, and meeting the multi-use of consumer.3 In large business system, ordinarily, some disks are used simultaneity. And these disks have some relationship about data. These disks must have an exactly simultaneous backup time to keep the exactness of the backup data. Atomic Group backup gives support to large database backup for coherence and integrality.4 On VxFS file-system, getting the service non-stop backup by using Freeze function.5 Supporting frequently used server softwares, and enhancing the facility.