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ServHA to run on Windows and Linux platforms are dual-cluster product, which is responsible for managing two hosts run their own applications, when the software on the host or host failure, without human intervention, dual-host cluster Also heartbeat line, can detect the failed host, accurately and quickly transfer the original host application to another host continue to run, uninterrupted operation of the whole system, the whole system in order to ensure the normal external services for enterprises INSTITUTIONS 24 hours × 365-day business-critical applications provides a powerful guarantee. ServHA dual system of two servers (hosts) are connected to the system with disk array (shared memory), the user's operating system, application software and ServHA software were installed on two hosts share data database stored in the storage system, establish a heartbeat via private (or public) network connection between two hosts. After configuring the host system begins to work better, ServHA service begins monitoring system, through the heartbeat connection, ServHA services on each host can monitor the status of another host. When the working host fails, heartbeat will produce changes, which can be connected by ServHA service captured by a heartbeat. When the capture of such a change control system after ServHA will host switch that is turned on and the work of the host backup application to take over the job as host of the work (including providing TCP / IP network services, access to the storage system and other services) and alarm, prompting management to repair the failed host.