Research Of Remote Backup Systems For Disaster Recovery

With the widespread use of information and network technologies, Information Security has become study focus. Disaster recovery is the research hotspot and emphasis in the field of Information Security. Disaster recovery technology can protect valuable information in the computer systems and efficiently ensure the computer systems normal work when the disaster occurs.Remote backup systems provide system continuous availability even when disasters hit the primary. In a remote backup system, a backup tracks the state of the primary and in the event of the primary failure takes over transaction processing without causing users to observe a breach in service. Remote backup is a significant method used to support disaster backup and recovery. A comprehensive survey on the architectures, models and algorithms of the remote backup systems is given, the advantages and applicable range of these models and algorithms are discussed respectively, the shortcomings and problems existed are also analysed, and then a comprehensive comparison is given.Based on analyses and research of models, algorithms and related technologies of remote backup systems, we present an optimized o2-safe approach to maintaining remote backup systems which sufficiently exploits parallelism between transactions by reconstructing the dependencies of transactions at the backup system. The approach presented achieves high throughput during normal processing without risking loss of transactions in case of primary failures. Our performance study confirms this result. The failure-handling techniques developed are able to handle both partial as well as complete system failures and guarantee continued availability of a database partition. Finally, we simulate some approaches to test their properties, performance and validity.