Partial Migration in an 8mm Tape Based Tertiary Storage File System and its Performance Evaluation through Satellite Image Processing Applications
نویسندگان
چکیده
Recent attention on global environmental changes has stimulated the development of large scale global information systems. Satellite images play a very important role for understanding these global changes. However, the data size is very large and current commercial hierarchical le management systems are not e cient enough to handle such huge data les. Migration of a whole le from tape to disk takes a very long time. Usually users are not interested in a whole image but in only a small portion of it. Thus, there is no need for full migration. We designed and implemented a partially migratable le system based on 8mm tape robotics. The le system migrates only the necessary portion of a le onto the disk. Two real application programs: radiometric/geometric correction and NDVI (Normalized Di erence Vegetation Index) generation, were chosen and executed using our experimental le system. Large performance improvements were achieved when compared to the conventional le level migration scheme.
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