Abstract
Recently the demand for large-scale file systems has been increasing for global information systems, multimedia databases and so on. However, current commercial hierarchical file management systems are not efficient enough to handle huge data files. Migration of a whole file from a tape to a disk takes a very long time. Usually, users are not interested in a whole image but only in a small portion of it. Thus, there is no need for full migration. We designed and implemented a partially migratable file system based on 8 mm tape archivers. The file system transfers only the necessary portion of a file onto the disk. Two real application programs, radiometric/geometric correction and NDVI (Normalized Difference Vegetation Index) generation, were chosen and executed using our experimental file system. Large performance improvements were achieved compared to the conventional file-level migration scheme. © 1999 Scripta Technica, Syst Comp Jpn, 30(3): 23–30, 1999
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