Data Transfer over the Long Fat Networks
摘要
The necessity to distribute the data over the wide area network( WAN) to the physicists'home institutes will increase,and the effective utilization of the network becomes crucial,However,networks in the future WAN will typically have a large bandwidth at an order of gigabit per second,with a latency of several hundreds seconds so that the large bandwidth-delay prodeuct extends to tens of megabytes and numerous problems are encountered.such networks are calledlong fat networks(LFNs) In order to study the data transfer operating on a long fat network,we have built the PC clusters connected with the router which can simulate bandwidth limitations.delays,packet losses,and multipath effects.this router is running on FreeBSD with DUMMYNET kernel option.On these machines we have measured the performance of the bulk data transfter with numerous conditions and studied the effecient transfter methods.