Press readiness backup system can be divided into cold backup, warm backup and hot backup three categories:
1> Cold Backup: the backup system is not installed or configured to be the same as or similar to the system currently in use operating environment, application The system data is not timely backup system is loaded. Event of a disaster, the configuration required to be installed operating environment, the backup data to restore the application data medium (tape or disc), manual or automatic batch make up transaction-isolated data, the end user will switch to the backup system through the communication line, to restore service operation
advantages: low investment in equipment, to save communication costs, less demanding communication environments
disadvantages: long time to recover, generally several days to 1 week, data integrity and consistency poor
2> warm backup: the backup system is configured to be installed the same or similar to the system currently used system and network environment, the installation application service data backed up regularly. Event of a disaster, the backup data is directly used on a regular basis, manual or automatic transaction-batch or retroactive orphaned end-user data is switched to the backup system via a communication line, to restore service operation
advantages: less capital investment, less demanding communication environments
disadvantage: recovery time long, generally more than ten hours to several days, data integrity and consistency poor
3> hot backup: backup is online, the current high-speed applications in real-time data communication line to transfer to the backup system, the backup system to maintain synchronization with the application of the current system data; data applications may be timing recovery system on the backup system. Once a disaster occurs, the data is not retroactive isolated or just make up a small backup system can quickly take over the production system running, restart
advantages: shorter recovery time, usually tens of minutes to several hours, data integrity and consistency of the best, minimum possibility of data loss
disadvantages: equipment investment, high communication cost, high communication environmental requirements, usually run more complex management
In the computer server backup and restore the
backup server cold backup servers (cold server) is only used if the primary server is lost. Cold backup server opens substantially only in case of a software installation and configuration, and then turn off and on until the required
temperature backup server (warm server) are generally switched periodically is updated according to the content of the primary server, and then shut down. Often with warm backup server to copy and mirroring operations
hot backup server (hot server) is switched in time, synchronized with the host. When a host fails, the backup server can be enabled at any time instead of hot
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