一种基于过滤驱动的写时拷贝快照方法

A Copy-on-Write snapshot method based on filter driver

为了在Windows操作系统下实现快照,提出了一种使用Windows卷过滤驱动程序和虚拟磁盘设备驱动来实现写时拷贝快照的方法.本方法使用过滤驱动来截获写操作,使用文件来存储快照数据,使用虚拟磁盘设备驱动来提供快照卷服务,可成功地对Windows下的卷进行写时拷贝快照.而且,本文介绍的快照方法可用于网络备份系统等.

In order to implement snapshot in Windows system, a snapshot method which use Windows volume filter driver and virtual disk driver to implement Copy-on-Write snapshot is proposed in this paper. Volume filter driver is used to filter the write operation, files are used to store the Copy-on-Write data and virtual disk device driver is used to provide the interface to access the snapshot volume. This method can be used in network backup system.