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北京市公安局出入境管理处的办公自动化网络建于1998年,在局域网络中的服务器主要包括:数据库服务器,内部 Web 服务器,外部 Web 服务器及 E-mail 服务器、财务软件服务器等,其中数据库服务器为 Compaq公司生产的 Alpha Server4100,安装 Compaq Unix 操作系统,Oracle 数据库,完成全部涉外系统数据的存储。信息中心在系统建设初期曾采取了许多防范措施,例如,利用数据库服务器 Alpha Server 4000的软件镜像技术,实现硬盘的镜像,保护数据。但是,这种技术存在着很多的局限性,包括:服务器可扩充磁盘数量有限,镜像技术使系统消耗一半数量的磁盘用于备份。镜像技术不能将操作系统备份,这样一旦系统故障,将导致业务终断,必须耗费一定的时延恢复系统。镜像技术
Beijing Municipal Public Security Bureau Exit-Entry Administration Office Automation Network was built in 1998, the server in the local area network include: database server, internal Web server, external Web server and E-mail server, financial software server, database server For Compaq’s Alpha Server4100, install the Compaq Unix operating system, Oracle database, complete all the foreign system data storage. Information Center in the early stages of system construction has taken many precautions, for example, using the database server Alpha Server 4000 software mirroring technology to achieve the hard disk mirroring and data protection. However, there are many limitations to this technique, including a limited number of server expandable disks and mirroring that consumes as much as half the system’s disk for backup. Mirroring technology can not back up the operating system, so once the system failure, will lead to business termination, you must spend some delay recovery system. Mirror technology