Research On Lazy Update Replication Technology For Web Server Backup System

Using data Web server backup system to backup key data is a feasible solution to solve data corruption and loss.In redundant technology,we can send requests to the system in another redundant system.In this way,if a specific node or more than one node fails to run,it will not cause the whole system to stop running.The purpose of this study proposed the use of lazy update replication technology in the Web server backup system for better service efficiency.The offline mode is used to repair the system,and it can be used normally under the time constraint.However,passive replication is the most popular replication technology in the Web server backup system,but it has low efficiency.This research puts forward two kinds of lazy update replication technology based on lazy update.One is Periodic Lazy-update Replication.The principle of this method is the large-scale replication of request scalability,as well as the complexity of data access.It is very easy to determine the final update of the write system by comparing the version,but it is difficult for the system to return the object collection to decide what the latest collection should be.Most of these systems,write collections are usually less than replica nodes,and then lazy update replication technology is applied to other replica nodes.All replica nodes get the updated cycle,which is the inconsistent window mentioned earlier.The basic running feature of the lazy update replication technology is that the main server stores the client request messages in the master server in the log format,and then wait until the scheduled time to collect the log data to the backup server.Another one is lazy Log-Replicated Lazy-update Replication.Its working principle is to get the operation log information and then to carry out precise recovery and selective recovery.First,the user uses the data query and the browsing tool to determine the file operation set that needs to be restored,and then uses the corresponding log data to generate the recovery request according to the record sequence,and sends it to the program of the file server side.It requests the file system recovery module through the proc file to restore the module and restore the module.This is lazy update replication technology,which has the main server to store client request in log format and sends it to the backup server immediately.The characteristic of the lazy update replication technology is to automatically scan the local file and to complete the lazy update and copy of the data,which greatly reduces the rate of error and the response time.The research results show that the lazy update replication technology has better performance than the passive replication technology in the Web server backup system department.