Abstract: The wide application of the computer network technology results in the roaring expansion of information. The demand on high applicability and high safety of the information processing system greatly facilitates and revokes the development and application of the backup system for disaster recovery. This system can maximally ensure the normal operation of the computer information system in case of disaster. To establish such a system, the grades should be clearly understood first, and then the tec

Key words: disaster recovery, backup, statistic grading disaster: applied grading disaster, mirror image

摘要： 随着计算机网络技术的普遍应用，使得信息盘快速膨胀 。 对信息处理系统的高可用性和高安全性的需求，极 大地刺激了容灾各份技术的应用和发展 。容灾各份系统能够在灾难中最大限度地保障计算机信息系统提供正常的 服务。要建立一个容灾备份系统，首先要了解容灾各份的等级要求，其次要了解其具体实现技术。本文将对容灾各 份的基本概念、容灾各份的等级要求和容灾齐份系统采用的技术作一介绍

关键词: 容灾, 各份, 数据级容灾, 应用级容灾, 镜像