| The development of computer follows certain disciplinarian,such as the development of processor comply with Moore's law,the power of microchip doubles every 18 months.The progress of transfer technology keep to Gilder's law.In addition,according to Turing theory,the development of storage technique is that density of hard disk and RAM increase four times every two years.Actually,magnetic disk performance is restricted by delaying in deed,and only do increasing by ten percent annually.Therefore,the bottleneck of capability of modern computer systemic is limited to by the CPU transfered to I/O.At the same time,there are often dealing with a great lot of data in the computer application,such as treated with and analyzed mass experiment data,disposed the input and output of multimedia data.Consequently,with the immensity development of the data transacted,transmitted and memory technology.Because the I/O subsystem is short of improving correspondence amony them,resulting in I/O becoming main bottleneck in systemic.Galaxy Kylin operation system,KYLIN for short,is supported by 863 software particularly National Research project.Base on the demanding of our country new generation national defence domain information systemic,which requires rapid pace disposal,great throughput IO,high dependability and fine expansibility.The Fault tolerance database systemic is carried out on Kylin,which is the problem of the development of the national operation system--Kylin.From what have mention above,we design and implemente Raw I/O mechanism,and frame the fault tolerance databse system base on Raw I/O technology.The reliability and safety of the database fault tolerance backup system may be analyzed by using Markov model which synthesize multi-model of the invalidation.,The experimentaion manifestation that the system is provided with better performance,and bring a few influence toward the executed efficiency of combine affair also. |
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