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The optimal tradeoff between node storage and repair bandwidth is animportant issue for distributed storage systems (DSSs). As for realistic DSSswith clusters, when repairing a failed node, it is more efficient to downloadmore data from intra-cluster nodes than from cross-cluster nodes. Therefore, itis meaningful to differentiate the repair bandwidth from intra-cluster andcross-cluster. For cluster DSSs the tradeoff has been considered with specialrepair assumptions where all the alive nodes are utilized to repair a failednode. In this paper, we investigate the optimal tradeoff for cluster DSSs undermore general storage/repair parameters. Furthermore, a regenerating codeconstruction strategy achieving the points in the optimal tradeoff curve isproposed for cluster DSSs with specific parameters as a numerical example.Moreover, the influence of separate nodes for the tradeoff is also consideredfor DSSs with clusters and separated nodes.

Storage and Repair Bandwidth Tradeoff for Distributed Storage Systems with Clusters and Separate Nodes