rosereplicator中页面文件的策略分析及效率研究-policy analysis and efficiency research of page files in rose replicator.docx
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rosereplicator中页面文件的策略分析及效率研究-policy analysis and efficiency research of page files in rose replicator
摘 要摘 要当今社会,是一个信息化高度发达的社会,随着信息化程度的深入发展,企 业的数据以指数方式增长,大量的数据在带给企业财富的同时,数据丢失带来的 损失也越来越大,容灾备份的重要性也随之显现出来。敦阳泰克科技(成都)有限公司的 RoseReplicator4.0 是一款基于文件系统的容 灾备份产品,为容灾提供了一套低成本、高效率的解决方案。该软件可以根据用 户的实际需要将数据实时或定时复制到远程异地目标主机。当本地主机发生故障 或数据被破坏之后,可以通过远程异地目标主机进行数据恢复。同时还可以使用 远程异地主机提供本地主机的备份服务,当本地主机的服务因为某种原因停掉之 后,目标主机可以迅速的对本地主机服务进行接管,继续对第三方进行服务,从 而最大限度的保证业务的连续性。本文以 RoseReplicator4.0 中页面文件的置换策略为主要研究对象。其主要研究 内容为:(1)I/O 数据的有序性。从驱动中捕获的 I/O 数据写入 pagefile 的顺序必须是 正确的;同时,传输时从 pagefile 中读出的 I/O 数据的顺序也必须是正确的。确保 读写 I/O 操作数据的有序性。(2)页面文件的置换策略。当驱动数据写满内存时,需要将部分 pagefile 换 出内存,存入磁盘;当需要的驱动数据不在内存中时,则需要将相应的 pagefile 从 磁盘换入到内存中。其主要目标是提高页面文件的读写速度以及优化置换算法、 减小系统开销、提高效率等。(3)页面文件的合并同步策略。当磁盘被写满时,没有空间进行内存的交换, 这时应该停止 pagefile 的写入,对 pagefile 进行合并,同步已经修改的 pagefile,将 不需要同步的文件从 pagefile 中删除。关键词:容灾备份,页面文件,置换策略,效率ABSTRACTABSTRACTNowadays, informationization is a highly-developed. With the deep development of the informationization, the data of an enterprise are increasing in exponential way. Though large amounts of data bring the enterprise wealth, the losses resulted from data loss become greater and greater at the same time. And thus, the importance of disaster recovery will loom large accordingly.RoseReplicator4.0 developed by Rose Datasystems Inc. is a disaster recovery product based on file system, and it offers a low-cost and high-efficiency recovery solution. This software could replicate the data in real time or scheduled time to remote target host according to the need of user. In case the host failure or data corruption occurs in local host, data can be recovered by the remote off-site target host. Meanwhile, the remote off-site target host can offer backup service for the local host. When the service of the local host is cut down for certain reasons, the target host will take over its service quickly and continue offering service for the third party. Thus, the service continuity will be ensured to the maximum extent.The thesis is mainly to investigate in the page files’ swapping policy of RoseReplicator4.0. The
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