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Research & Development

News Release Overview


May 27, 2016


Data Replication for Disaster-resilient Information Platforms

Release Digest

The Research Institute of Electrical Communication of Tohoku University, Hitachi, Ltd., and Hitachi Solutions East Japan, Ltd. today announced the development of a data replication method to protect data and enable the continuation of information services in disaster affected areas even when there is wide area network disruption preventing access to remotely located back-ups. A simulation was conducted on a configuration of 24 servers at various municipal locations at the city or prefectural level. When the data was replicated between locations unlikely to be simultaneously affected, the simulation confirmed that 94% of the data could be protected when 50% of the servers were damaged. By changing the number of data replicas to be made according to the risk of data loss, the same amount of data can be protected with half the amount of replicas compared to conventional methods. This technology will enable disaster-resilient information platforms at a practical cost.

This technology development was conducted under the commissioned research project, "Research and Development on Highly-functional and Highly-available Information Storage Technology" funded by the Ministry of Education, Culture, Sports, Science and Technology, Japan. A part of this work will be presented at a meeting of the IEICE Technical Committee on Magnetic Recording & Information Storage, to be held from 9-10 June 2016 at Tohoku University, Sendai, Japan.

Concept of cost/risk-aware data replication (Example: 4 servers with an average of 1.5 replicates)

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