VDFSVisualSVN Distributed File System
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At a lower level of the architecture, the resource layer centrally stores all resources such as public VDF and private VDF in MTC resource nodes.
With the UDA, all the increased record of VDF will be updated to the resource layer.
As Figure 6 shows, the resources and services are divided into public VDF, private VDF, and mixed VDF according to the service mode.
The distributed VDF is entity that can be accessed and updated by the owner during a period.
As the visit frequency and times of public VDF are far more than that of other files, we name the public VDF as metadata and separate the metadata from file data.
There are dedicated servers that specially manage public VDF and provide a straight access for metadata.
All these resources are presented to mobile users as VDF and can be accessed as normal disk file.
However, it is worth mentioning that, with SRSM in MTC, all the data, applications, and customized services that the user kept in the tablet will be saved to the server as private VDF, rather than to the mobile device, thus to enable any device with the same authentication accessing the same customized services and provide a limitless storage for users.
Under the structure of distributed resource layer in SRSM, the public VDF is unified managed by the SRSM center.