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A Simulation Result of Replicating Data with Another Layout for Reducing Media Exchange of Cold Storage
Satoshi Iwata and Kensuke Shiozawa, Fujitsu Laboratories Ltd.
Cold storage devices such as tape and optical discs are a good solution for reducing the total cost of owner- ship for storing data. However, there is a drawback in that media and drives are separated, and placing me- dia into drives when accessing data needs a few min- utes of time. Though placing correlated data together in the same medium reduces media exchange, multi- dimensional searches disrupt it. We propose two ap- proaches which replicate data and place them in different layout for solving the problem. By concentrating on rela- tive latency reduction or utilizing replicas originally gen- erated for avoiding data loss, our method achieves high latency reduction with restricted capacity efficiency loss. A simulation result shows 31% average relative latency reduction with capacity efficiency remaining at 91%.
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