| 摘要 |
The Data Shadowing System comprises a memory module that is connected to the monitored computer system via an existing input/output port to store the shadowed data. The memory module includes a memory device for data storage as well as software, including a control software component that is automati cally installed on the monitored computer system when the memory module is f irst connected to the monitored computer system, as well as associated modul e software for maintaining a record of the data stored on the memory device. The Data Shadowing System automatically stores the data on the memory modul e in a single format, while representing it in a data management database in two formats: disk sectors and files. The Data Shadowing System thereby effi ciently tracks and stores the state of multiple file systems over time, whil e allowing for correct disk-level and file-level restoration to a point-in-t ime without storing redundant data.
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