Exact optimal repair bandwidth for (n,n-2,2) MDS array codes is the maximum of ⌈(5n-8)/4⌉ and 2n-q-3 (with few exceptions); repair I/O follows an analogous formula with ⌈(4n-6)/3⌉.
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Optimal Repair Bandwidth and Repair I/O of $(n,n-2,2)$ MDS Array Codes
Exact optimal repair bandwidth for (n,n-2,2) MDS array codes is the maximum of ⌈(5n-8)/4⌉ and 2n-q-3 (with few exceptions); repair I/O follows an analogous formula with ⌈(4n-6)/3⌉.