层次化网络备份数据存储组织与快速索引技术

Data Organization and Quick Indexing Technologies in Disk-based Network Backup

备份的最终目的在于灾难发生时的数据恢复.缩短恢复时间是提高整个备份系统性能和可用性的关键.本文面向备份最终目的来有效地组织与检索数据,提出一种虚拟磁带层次化数据存储组织方法以及基于这种存储组织方法的快速索引技术.综合利用这两种技术,使备份性能随着备份数据量的不断增加而逐渐提高,最终趋于稳定;并以较小备份性能损失换取恢复性能的较大提高,随着备份数据量的增加,备份性能损失也将随之减小,但恢复性能将保持稳定.在整体上提升了备份系统的性能和可用性.

The ultimate purpose of data backup is the ability of retoring data as soon as possible when disaster happens. Shortening the time taken by restore is the essence of enhancing the performance and value of the whole backup system. Taking the thought of ultimate purpose of data backup ,we organize and search backup data effectively by using a method of tape simulated and stratified organization of backup data and the stratified index mechanism on the basis of this kind of organization. By using the both two technologies ,the performance of backup could be improved gradually when the size of backup data increase and finally comes to a stable state. The performance of restore is improved significantly while there is a little loss of performance of backup as the price,but when the size of backup data is increasing,this kind of performance loss of backup will descend,while the restore performance will keep stable ,so the performance and the value of the whole backup system is improved.