Hot Backup

introduction

Dual machine thermal back-up technology is a kind of software and hardware combined with high fault-tolerant application solutions. The scheme consists of two server system and an external Shared disk array ark (also can not, but in their own server take RAID card) and the corresponding dual machine thermal backup software component.

In this fault-tolerant scheme, operating system and application servers installed in the local system tray, the network system of data is through the disk array of centralized management and data backup. Data through centralized management is double machine thermal back-up systems, will all site directly from central storage equipment data storage, and read and manage by professionals, greatly to protect the security and privacy of the data. Of the user data stored in external Shared disk array, in a server malfunction, standby active alternative host work, to guarantee that the network service uninterrupted.

Dual machine thermal back-up system USES "heart" method guarantees the main system and standby system connection. The so-called "heart", it refers to the master-slave system according to certain between the time interval send communication signal that their system current condition. Once the "heart" signal to stop that host system breaks down, or standby system cannot receive host system "heartbeat" signals are the system availability management software that host system breaks down, host stopped working, and the system resource transfer to standby system, standby system will replace host play a role, to ensure that the network service running uninterrupted.

Dual machine thermal backup scheme, according to two server way of working can have kind of 3 kinds of different working mode, namely: dual machine thermal standby mode, dual machine mutually standby mode and dual machine full-duplex mode.

Working mode

Dual machine thermal standby mode

Namely, currently active/standby usually say of active server in ways working condition; And standby server in monitoring, data server ready state includes database data also went to two or more servers write (usually each server using RAID disk array card), ensure data real-time synchronization. When the active server failure diagnosis, through the software test or manual mode activated, ensure standby machine will be applied in a short time fully recover normal use. Typical applications in securities funds server or market server. This is currently USES a kind of more model, but due to the another one server is chronically mothball state, from a computational resources, there is a certain considerations of waste.

Dual machine mutually standby mode

Are two relatively independent application in two machines and operation, but they are set to standby, when a server malfunction, a different server can be inside short time will come over the fault server application, so as to ensure the sustainability of application, but the performance requirements of the server is higher. Configuration relatively better.

Dual machine full-duplex mode

Is the cluster (cluster: cluster includes two kinds, one kind is the network load balance, don't a is server cluster. Here's dual machine full-duplex mode belongs to the network load balance clustered.) One kind of form, servers are activities and running the same application, assure integral performance and achieving the load balance and mutual backup, need to use disk ark storage technology (had better use sans style). WEB server or FTP server with this way as more.