High Speed Beowulf Cluster using gigabit ethernet

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Hello,

I will be building a high speed Beowulf cluster using gigabit Ethernet. I was doing some research before that.

Some of the cluster configuration that I saw online had two NIC's and some had just one.

My question was, is the extra NIC used only to increase the I/O throughput or for some other specific purpose ? 

None of the sites seem to elucidate this point.

If any one in the list can shed light on this, I would appreciate it.

Thanks in advance,

Max
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