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With high reliability, high scalability and high availability for main mark of the cloudstorage service comprehensive promotion, in the future a period of time, cloud storage isstill the one of the important content of research.In the cloud storage system, data technology is still the indispensable copy of animportant component. Data storage system to improve the copy technology of usability,reduce user access network latency, reduce the system network bandwidth consumptionand so on, all have the incomparable advantage. For the cloud storage system of copytechnology research is still in the initial stage, the copies of the data to create strategy,transfer strategy, delete strategy, consistency maintenance strategy to still need to befurther exploration and research.In order to improve the service quality as the cloud storage system purpose, thispaper copy of the technology of replication strategy and copy the consistency maintenancestrategies. In a copy of the creation of strategy, joining in the node load balance ofconsideration, from the trigger mechanism, copy create replication quantity, depositingcopies choice mechanism three are analyzed. In general, this paper the innovation pointsas follows:(1) Put forward based on the dynamic load balancing copy create strategy, thisstrategy include copies of the trigger mechanism, create replication quantity, depositingcopies mechanism, etc., through analyzing the mechanism of the research, the algorithmare given respectively they describe and draw the corresponding flow chart;(2) In a copy of consistency strategy gossip algorithm analysis, and put forward akind of optimization scheme. Optimization scheme is mainly for gossip in the traditionalalgorithm, due to random selection of node spread the message and update a significantamount of information redundancy problem, puts forward the optimization scheme, theoptimal solutions and algorithm is described.
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