CSE 486/586 f4: Cross-Datacenter Additional parity block –Can tolerate a single datacenter failure Average space usage per block: 2.1X –E.g., average for block A & B: (1.4*2 + 1.4)/2 = 2.1 With 2.1X space usage, –4 host/rack failures tolerated –1 datacenter failure tolerated 19
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