The two servers (hosts) of the ServHA dual-machine system are connected to the disk array (shared storage) system. The user's operating system, application software and ServHA software are installed on the two hosts respectively, and shared data such as databases are stored on the storage system. A heartbeat connection is established between two hosts through a private (or public) network. After the configured system host starts working, the ServHA service starts to monitor the system. Through the heartbeat connection, the ServHA service on each host can monitor the status of the other host. When the working host fails, the heartbeat information will change, and this change can be captured by the ServHA service through the heartbeat connection. After capturing this change, ServHA will control the system to perform host switching, that is, the backup machine starts the same application as the working host to take over the work of the working host (including providing TCP/IP network services, storage system access, etc.) and An alarm is issued to prompt management personnel to repair the faulty host.
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