A Simulation Result of Replicating Data with Another Layout for Reducing Media Exchange of Cold Storage

Cold storage devices such as tape and optical discs are a good solution for reducing the total cost of ownership for storing data. However, there is a drawback in that media and drives are separated, and placing media into drives when accessing data needs a few minutes of time. Though placing correlated data together in the same medium reduces media exchange, multidimensional searches disrupt it. We propose two approaches which replicate data and place them in different layout for solving the problem. By concentrating on relative latency reduction or utilizing replicas originally generated 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%.