In the traditional two-rack distributed storage system (DSS) model, due tothe assumption that the storage capacity of each node is the same, the minimumbandwidth regenerating (MBR) point becomes infeasible. In this paper, we designa new non-homogeneous two-rack model by proposing a generalization of thethreshold function used to compute the tradeoff curve. We prove that by havingthe nodes in the rack with higher regenerating bandwidth stores moreinformation, all the points on the tradeoff curve, including the MBR point,become feasible. Finally, we show how the non-homogeneous two-rack modeloutperforms the traditional model in the tradeoff curve between the storage pernode and the repair bandwidth.
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