Hot Standby knowledge

銆怰EVIEW銆?so-called hot standby is to use two servers to back up each other to jointly perform the same service, one of the hosts for the work machine (Primary Server), another host for the backup machine (Standby Server). In the system under normal circumstance, the working machine for the application service, the backup machine to monitor the operation of work machine (work machine while also testing the backup machine is normal), abnormal when the work machine, can not support the application of system operators, the backup machine initiative to take over the work of machine work, and continue to support critical applications, to ensure uninterrupted operation of the system.

What is a hot standby?

The so-called hot standby is to use two servers to back up each other to jointly perform the same service, one of the hosts for the work machine (Primary Server), another host for the backup machine (Standby Server). In the system under normal circumstance, the working machine for the application service, the backup machine surveillance operation machine (work machine while also tests the backup machine is normal), when the work machine abnormal operation of the system can not support the application, the backup machine initiative to take over the work of machine work, and continue to support critical applications, to ensure uninterrupted operation of the system.

Under what conditions to use hot standby?

Users can the importance of the system and end-user service disruption tolerance decision of whether to use hot standby. Example, users on the network can tolerate up to how long recovery? If the service can not quickly return to what would result in consequences. Commitment to critical business applications for enterprise servers that require high stability and availability, requires 7 脳 24 uninterrupted service, recommended to use hot standby.

I already have a RAID, and tape backup, is also necessary to do two-machine? Or, if I did a two-machine backup, tape backup is also necessary to do it?

RAID and data backup is very important. However, the hard disk RAID technology can not solve the problem, the backup system can only solve problems after recovery. Once the server itself is a problem, whether it is equipment, hardware problem or software problem, can cause service interruptions. Therefore, RAID and data backup technology can not avoid service disruption occur, the need for continuous and reliable delivery of application services, double still very necessary.

Data backup is essential to protect data security measures. Because whether or Dual RAID, is a real-time backup. Any software errors, virus, misuse, etc., will synchronize the data in more than an impact. Therefore, even with a pair of key business aircraft programs also still have to backup data in order to be able to data corruption, loss of time to recover.

How to choose and implement hot standby configuration program?

1. To application-oriented, high-availability for the purpose of analyzing the need for demand; 2. Choose to identify specific equipment, software, models and so on. Note that: different software or hard disk or other storage device, there is compatibility issues between them, so should consult professionals before buying to avoid purchasing the two units of the relevant software is not compatible storage devices such as the existence phenomenon. 3. In the implementation is completed, must be tested to ensure that work properly, but should be noted that in the regular course of operation of the system is switched to the normal test.







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