| Project/Area Number |
07408008
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
情報システム学(含情報図書館学)
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| Research Institution | University of Tokyo |
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Principal Investigator |
TAKAGI Mikio University of Tokyo, Institute of Industrial Science, Professor, 生産技術研究所, 教授 (30013113)
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| Co-Investigator(Kenkyū-buntansha) |
NEMOTO Toshihiro University of Tokyo, Institute of Industrial Science, Research Associate, 生産技術研究所, 助手 (20272510)
KITSUREGAWA Masaru University of Tokyo, Institute of Industrial Science, Associate Professor, 生産技術研究所, 助教授 (40161509)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 1996: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1995: ¥10,000,000 (Direct Cost: ¥10,000,000)
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| Keywords | archiving system / parallel processing / load balancing / tape migration |
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| Research Abstract |
To establish the method of constructing a very large scale archiver of peta byte class which is needed at the coming generation by means of combining relatively small commodity archivers of tera byte order, we develop the efficient file management algorithms. Cooperation of element archivers ranging form hundreds to thousands, file management and file migration on them are not studied yet.
At first, we studied the feasibility of parallel archiving system, clarified the migration algorithms which could be realized physically and estimated the costs and performances for them. We designed a conceptual architecture of parallel archiving system consisting of hundreds to thousands of element archivers and proposed the access frequency based adaptive algorithms for the tape migration between the element archivers. We indicated that considering the processing capability of each element archiver made it possible to redistribute tapes automatically among the element archivers and to serve requests even if some tape drives fails. Further, cooperation of the element archivers to fasten data I/O operations was also examined. Moreover, using the file organization and the access pattern at the global environmental database system, we clarified the effectiveness of the parallel archiveing system for real applications.
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