云灾备关键技术

信息系统的容灾备份是灾难发生时确保业务连续性和数据可用性的重要手段。云灾备是客户付费使用灾备服务提供商提供的灾备服务的一种灾备模式。客户可以利用服务提供商的优势技术资源和成熟的运维管理流程,快速实现灾备,降低灾备系统的总体拥有成本。文章介绍云灾备的3个关键技术：重复数据删除技术、云存储安全技术和操作系统虚拟化。前两者解决数据级云灾备中的效率和安全性问题,后者解决系统级云灾备的灵活性问题。云存储安全技术的发展是云灾备能否得到广泛应用的一个决定因素。

Key Techniques for Cloud Disaster Recovery

Disaster Recovery （DR） for information systems is essential to ensuring business continuity and data availability when disasters occur. Cloud DR is a new paradigm whereby customers pay to use a DR service. The technical resources and mature operating and management procedure of a cloud provider can be exploited so that DR goals can be achieved quickly and the full cost of owning a DR system can be reduced. Cloud DR has three primary features： data de-duplication, cloud storage security, and operating system virtualization. The first two are designed to solve problems of efficiency and security in data-level cloud DR; the last is designed to solve the problem of flexibility in system-level cloud DR. The development of cloud security will be a determining factor in widening cloud DR application.