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Does anybody have any experience in building a rocks cluster using
infiniband to connect the compute nodes to the head node (where my storage
array is)?  Generally, you create a private network for communication
between everything but I'm wondering if it works the same way using
infiniband?  I know you can assign the infiniband adapters IP addresses but
is this the best way to do things?  Does that mean I need to buy an
infiniband switch?  Any suggestions on hardware to use and/or
setup/configuration advice?

Thanks,
Bill