【 Weak current College 】 hot backup mode in fault-tolerant server application---Power By 【 China power house network 】

Hot backup method of determining is a business to own data protection of important links, a good way to data recovery rate and enterprise business sustainability. The hot-standby mode using two configuration identical server system, in fact, server cluster scenario of fault-tolerant technology is also a multi server fault-tolerant technologies.

While this section is to describe a single fault-tolerant technology is a server for high performance, fault-tolerant, its tolerance to far more than the server cluster and hot-standby mode fault tolerance to high, and therefore more suitable for those such as securities, telecommunications, financial, medical, etc. on fault tolerance special demanding industry.

Previous cluster system in the event of a failure, you need to interrupt the operation of the server, and then use the time to switch to the standby server to run above in order to carry out the repair and recovery, including the cost and loss is the user's wish to see. A fault-tolerant technology for fault-tolerant servers, the biggest advantage is that it can automatically isolate fault module, without disrupting the running module replacement for damaged parts for maintenance, and all physical fault elimination, the system automatically resynchronize run, thereby effectively solves the customer's extra worries. It is precisely for this reason, a fault-tolerant technology for fault tolerant server, is the impact of the rise of the previous years standby mode and cluster technology, more and more people are concerned about. Also, more importantly it can use industry-standard components of the server implementation (IA), competitive cost advantage that makes impressive fault tolerant servers.

Fault-tolerant server is through the CPU clock frequency, the system all hardware backup, including CPU, memory, and i/o bus, redundant backup; through system all redundant parts of synchronization run, realize the true meaning of fault tolerance. Any part of a system failure will not result in system failure and data loss. There are many fault tolerant system is based on IA Server, fully compatible with Windows2000, previously only on RISC systems, fault-tolerant can be achieved. This fault-tolerant technology in IA Server implementation, IA server reliability to 99.999 per cent, while the server is running is uninterrupted.

Standby mode and fault-tolerant servers positioned slightly different, this is determined by the difference between realization of availability. Hot backup mode in General can implement 99.9% availability, fault-tolerant servers can achieve 99.999% availability. In this way, most of the hot-standby mode applications in business continuity is not very strict industry, such as public security system, forces system or individual manufacturers, these industry allows data to be interrupted for a short period of time. While such as telecommunications, banking, securities and health care, and other demanding industries is a fault-tolerant servers all over the world. Also note that hot backup and server cluster does not like the hot backup usually require two way server configuration, and the server cluster is not strictly required, it is confusing to many readers.

In addition, because of the hot-standby mode requires at least 2 servers, resulting in the purchase of software (operating systems, middleware, dual backup software, etc), software maintenance, upgrades, system hardware upgrade needs more than a single fault-tolerant way 1 x additional inputs, and two-computer backup software failure, the maintenance of a high degree of difficulty, the customer will bring greater difficulties. Therefore, although the single fault-tolerant server hardware costs more than double machine backup mode of hardware input, while its total cost of ownership (TCO) is far below the double machine backup costs. But its flexible configuration, the hot backup mode more advantages, many hot backup scenarios are some systems integrators combine different manufacturers server products to meet different customer needs. But overall, fault-tolerant server is the future trend of development.