[Beowulf] Semi-philosophical Question

[Leigh]

I was talking over Beowulf clusters with a coworker (as I have been working 
on learning to build one for my company) and he came up with an interesting 
question that I was unsure of.

As most of the data is saved upon the "gateway" and the other machines 
simply access it to use the data, what happens when multiple machines are 
making use of the same data and they all try to save at once? Do they all 
work as one system and save it only once, or can multiple nodes 
theoretically be using one file and both try to save to it?

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