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- W2911071877 abstract "Cooperative regenerating codes are regenerating codes designed to tradeoff storage for repair bandwidth in case of multiple node failures. Minimum storage cooperative regenerating (MSCR) codes are a class of cooperative regenerating codes which achieve the minimum storage point of the tradeoff. Recently, these codes have been constructed for all possible parameters $(n,k,d,h)$, where $h$ erasures are repaired by contacting any $d$ surviving nodes. However, these constructions have very large sub-packetization. $epsilon$-MSR codes are a class of codes introduced to tradeoff subpacketization level for a slight increase in the repair bandwidth for the case of single node failures. We introduce the framework of $epsilon$-MSCR codes which allow for a similar tradeoff for the case of multiple node failures. We present a construction of $epsilon$-MSCR codes, which can recover from two node failures, by concatenating a class of MSCR codes and scalar linear codes. We give a repair procedure to repair the $epsilon$-MSCR codes in the event of two node failures and calculate the repair bandwidth for the same. We characterize the increase in repair bandwidth incurred by the method in comparison with the optimal repair bandwidth given by the cut-set bound. Finally, we show the subpacketization level of $epsilon$-MSCR codes scales logarithmically in the number of nodes." @default.
- W2911071877 created "2019-01-25" @default.
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- W2911071877 date "2019-01-18" @default.
- W2911071877 modified "2023-10-14" @default.
- W2911071877 title "On Epsilon-MSCR Codes for Two Erasures" @default.
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- W2911071877 doi "https://doi.org/10.48550/arxiv.1901.06336" @default.
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