The Google File System

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Without networkc ongestion, the
ideal elapsed time for transferring B bytes to R replicas is
B/T + RL where T is the networkthro ughput and L is latency
to transfer bytes between two machines. Our network
links are typically 100 Mbps (T), and L is far below 1 ms.
Therefore, 1 MB can ideally be distributed in about 80 ms.