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            I.6     Data virtualization CSP:SFP

                   Title                               Data virtualization by CSP:SFP

             Description      This scenario shows data virtualizations through the description of read and write data. DSF
                              service customer #1 writes a file through the DSF service. DSF service provider prepares to
                              write data because file A, shown in Figure 1, is saved on a single virtual volume. As the
                              preparation information (e.g., owner, policies and corresponding APIs of data storage, etc.),
                              data operation metadata for the file A is generated. The file A namely data A, is saved and
                              managed by the data operation metadata, such as number of data portioning, data location,
                              etc. In this procedure, the file A was abstracted for data provisioning and management by
                              policies.
                              DSF service customer #1 reads a file through the DSF service. DSF service provider gathers data
                              based on the data operation metadata. DSF service provider aggregates partitions of data and
                              then data is provided to DSF service customer #1. It is possible for the provided data to be
                              used again. Therefore, the data is cached and reflected on data operation metadata. For this
                              reason, DSF service customer #2 quickly reads the cached data. In this procedure, data A was
                              virtualized because the partitioned data A was aggregated as if originally single data A was and
                              then was used for multiple DSF service customers. That is, DSF service customer #1 and #2
                              read same data.
             Role/Sub-role    DSF service customer (CSC:CSU)
                              DSF service provider (CSP:SFP)
                              DSF local storage provider (CSP:CSM)
             Figure (optional)


























                                                   Figure 1 – Writing data by abstracting data























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