Dual-Machine hot standby technology

With the upsurge of data backup, dual-machine hot standby technology has been sought after by enterprises, but some people still do not understand "dual machine hot standby" is what technology, can achieve what effect, the following we will introduce in detail the dual-machine hot standby technology.

Dual-Machine hot-backup technology is a high-fault-tolerant application scheme combining hardware and software. The scheme is comprised of two server systems and an external shared disk array (or not, instead of a raid card in their respective servers) and the corresponding dual-machine hot backup software in this fault-tolerant scenario, the operating system and applications are installed on the local system disk of both servers, The data of the whole network system is centralized management and data backup through the disk array.

Span style= "line-height:0px;" > The centralized management is a dual-machine hot backup system that reads and stores data from all sites directly from a central storage device and is managed by professionals, which greatly protects the security and confidentiality of the data. The user's data is stored in the external shared disk array, in the event of a server failure, standby machine actively replace the host to ensure uninterrupted network services. Span style= "line-height:0px;" >

The dual-Machine hot backup system uses the "heartbeat" method to ensure the connection between the main system and the standby system. The so-called "Heartbeat", refers to the master-slave system between each other according to a certain time interval to send communication signals, indicating the current operating state of the respective system. Once the "heartbeat" signal indicates that the host system has failed, or the standby system can not receive the host system "heartbeat" signal, the system's high-availability management software that the host system failure, the host stopped working, and transfer system resources to the standby system, the standby system will replace the host to play a role, To ensure uninterrupted operation of network services.

Dual-Machine hot backup scheme, according to the working mode of two servers can have three different modes of operation, namely: dual-Machine hot standby mode, dual-machine mutual standby mode and dual-machine duplex mode. (The adoption of these three different models is based on specific problems.) What effect is achieved depends on the user's needs and the hard-to-use equipment to decide.

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Dual-Machine hot standby technology