Performance concerns with using large LUNs versus smallers ones

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Issue

Any performance concerns with using large luns versus smaller ones?
As far as the OS io subsystem is concerned would there be any significant performance difference between offering up a 1TB LUN from an aggregate, over 2 x 500gb LUNS from the same aggregate ( ie same splindle set)?

Environment

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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