Redundancy is mainly to ensure the security and reliability of the system, the function of the device or configuration, hardware. As well as to prevent doing repeated configuration. In case of system failure or hardware damage, the redundant configuration can be used as backup to timely undertake the work load to minimize the system failure time.
What kind of Redundancy?
It's mainly about power system redundancy, storage system redundancy, I/O card redundancy, CPU redundancy.
- Cold Standby
Cold standby is mainly done through the manual replacement of defective components to get the equipment or system working again.
- Warm Standby
Warm backup includes two sets of exactly the same configuration components. One normal operation is regarded as the main, the other belt machine does not run standby is regarded as the slave. Every once in a while, the content of the master and slave exchange, when the running component failure, the standby component will run to assume the work.
- Hot Standby
Hot standby is two sets of exactly the same components and run at the same tiem. The two sets conduct data acquisition, data processing and calculation at the same time. While the main set runs the output control task, and the two sets interact in real time. When the master and slave switch, it must be the undisturbed switch.