日本における大容量データの取得と保存

概要

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This tutorial paper reports on the current status of mass data archival and storage in Japan, on the basis of a survey of space facilities, meteorological facilities, broadcasting stations, a bank, and an electronic museum. Mass-scale data can be classified into two categories: text data, such as account data in banks and ticket reservation data for trains and airplanes, and image data, such as pictures of the earth's surface observed by satellites (EOS and others), television screen images broadcast daily by TV stations, and image data produced by recently established electronic libraries and museums. Mass data in banks or insurance companies belong to the first category, in which data integrity is of prime importance. One of the big city banks in Tokyo stores slightly less than 1TB of active data in a four-fold on-line disk system, with 200 TB of back-up data on 100,000 tapes. Mass data in space facilities, meteorological facilities, and broadcasting stations belong to the second category. Mass data ranging from tera-bytes to tens of peta-bytes in quantity are stored every year. The most crucial issues in mass data storage are how to maintain data integrity for long periods, sometimes more than 30 years, and how to update storage systems, with so many tapes recorded in the old format.
社団法人日本磁気学会の論文
1997-09-01