Active service is a kind of Web service which can be customized by customer’s requirement. The development of component technology provides foundation for the implementation of active services. Based on UCDL, the key technology of Local Component Resource Warehouse (LCRW) is expounded, the model of component library based on active service is constructed, the organization method by facet classification combined with ontology information classification is proposed, and the component retrieval based on Ontology Information is also proposed in view of facet retrieval.

The cloud storage is the evolution of the cloud computing system, which is based on data storage and management. This thesis is focused on the discussion of the cloud storage model that is built on the Cloud Storage Access Protocol of SNIA, and puts forward the concept of storage pooling at storage management layer with unified virtualization and dynamic management on physical storage devices. The thesis also compares the typical DFS (Distributed File System) on the data management layer in different data conditions.

With the development of cloud computing, cloud storage distributed the endless file system,but not a better copy strategy compatible with various file systems.This paper proposed ontology-based metadata replica which make different file systems mutual fusion ,and give a policy of replica allocation of low-load access .