| Summary: | Traditional single-cloud storage leads to data security and service flexibility problems,such as data privacy leakage and difficulty in meeting the needs of online real-time applications.Multi-cloud storage technology uses virtualization to integrate the online storage services of multiple cloud providers,so as to realize functions such as unified storage,performance tuning,data security and privacy protection,maximizing the value of cloud storage resources.This paper introduces the concept of multi-cloud storage technology,as well as its system architecture and advantages.Then the paper describes the main technical challenges of multi-cloud storage technology in data availability,integrity,consistency and security.And it focuses on analyzing and summarizing the research status of key techniques of multi-cloud storage,including erasure code-based fault tolerance,proof mechanism of data integrity,concurrency control method and secure deduplication technique.Finally,according to the weaknesses of the current research works on multi-cloud storage technology,this paper analyzes several potential further research directions.
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